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Theoretical analysis of frequency modulation-to-amplitude modulation on the final optics and target of the SG II-Up laser facility High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-12-06 Yujia Zhang, Wei Fan, Jiangfeng Wang, Xiaochao Wang, Xinghua Lu, Dajie Huang, Shouying Xu, Yanli Zhang, Mingying Sun, Zhaoyang Jiao, Shenlei Zhou, Xiuqing Jiang
Frequency modulation (FM)-to-amplitude modulation (AM) conversion is an important factor that affects the time–power curve of inertial confinement fusion (ICF) high-power laser facilities. This conversion can impact uniform compression and increase the risk of damage to optics. However, the dispersive grating used in the smoothing by spectral dispersion technology will introduce a temporal delay and
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Prospect of ultrahigh-resolution fast neutron absorption spectroscopy based on a laser plasma electron accelerator High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-30 Wen-Zhao Wang, Jie Feng, Xiao-Peng Zhang, Yao-Jun Li, Wei-Jun Zhou, Wen-Chao Yan, Guo-Qiang Zhang, Chang-Bo Fu, Li-Ming Chen
Fast neutron absorption spectroscopy is widely used in the study of nuclear structure and element analysis. However, due to the traditional neutron source pulse duration being of the order of nanoseconds, it is difficult to obtain a high-resolution absorption spectrum. Thus, we present a method of ultrahigh energy-resolution absorption spectroscopy via a high repetition rate, picosecond duration pulsed
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Synchronized off-harmonic probe laser with highly variable pulse duration for laser–plasma interaction experiments High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-29 J. Hornung, Y. Zobus, H. Lorenté, C. Brabetz, B. Zielbauer, V. Bagnoud
This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser–plasma interaction experiments. The system exhibits a novel seed-generation design, allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various
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Digital generation of super-Gaussian perfect vortex beams via wavefront shaping with globally adaptive feedback High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-29 Rui Ma, Ke Hai Luo, Jing Song He, Wei Li Zhang, Dian Yuan Fan, Anderson S. L. Gomes, Jun Liu
High-intensity vortex beams with tunable topological charges and low coherence are highly demanded in applications such as inertial confinement fusion (ICF) and optical communication. However, traditional optical vortices featuring nonuniform intensity distributions are dramatically restricted in application scenarios that require a high-intensity vortex beam owing to their ineffective amplification
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Analysis of mid-spatial frequency wavefront distortions from a liquid-cooled flash-lamp pumped Nd:phosphate laser amplifier High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-29 Pierre-Marie Dalbies, Sandy Cavaro, Edouard Bordenave, Nathalie Blanchot, Julien G. Moreau, Jérôme Neauport
Mid-spatial frequency wavefront deformation can be deleterious for the operation of high-energy laser systems. When fluid cooled high-repetition-rate amplifiers are used, the coolant flow is likely to induce such detrimental mid-spatial frequency wavefront deformations. Here, we describe the design and performance of a 90 mm × 90 mm aperture, liquid-cooled Nd:phosphate split-slab laser amplifier pumped
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Mismatch analysis of all-fiber coherent beam combiners based on the self-imaging effect High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-21 Yuefang Yan, Yu Liu, Haoyu Zhang, Yuwei Li, Chao Guo, Qiang Shu, Wenhui Huang, Feng Jing, Rumao Tao
All-fiber coherent beam combiners based on the self-imaging effect can achieve a near-perfect single laser beam, which can provide a promising way to overcome the power limitation of a single-fiber laser. One of the key points is combining efficiency, which is determined by various mismatches during fabrication. A theoretical model has been built, and the mismatch error is analyzed numerically for
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Continuous gradient fusion class activation mapping: segmentation of laser-induced damage on large-aperture optics in dark-field images High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-20 Yueyue Han, Yingyan Huang, Hangcheng Dong, Fengdong Chen, Fa Zeng, Zhitao Peng, Qihua Zhu, Guodong Liu
Segmenting dark-field images of laser-induced damage on large-aperture optics in high-power laser facilities is challenged by complicated damage morphology, uneven illumination and stray light interference. Fully supervised semantic segmentation algorithms have achieved state-of-the-art performance but rely on a large number of pixel-level labels, which are time-consuming and labor-consuming to produce
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Design, performance and application of a line-imaging velocity interferometer system for any reflector coupled with a streaked optical pyrometer system at the Shenguang-II upgrade laser facility High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-15 Dawei Yuan, Shaojun Wang, Huigang Wei, Haochen Gu, Yu Dai, Jiayong Zhong, Yutong Li, Gang Zhao, Jie Zhang
The velocity interferometer system for any reflector (VISAR) coupled with a streaked optical pyrometer (SOP) system is used as a diagnostic tool in inertial confinement fusion (ICF) experiments involving equations of state and shock timing. To validate the process of adiabatically compressing the fuel shell through precise tuning of shocks in experimental campaigns for the double-cone ignition (DCI)
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Detailed characterization of kHz-rate laser-driven fusion at a thin liquid sheet with a neutron detection suite High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-15 Benjamin M. Knight, Connor M. Gautam, Colton R. Stoner, Bryan V. Egner, Joseph R. Smith, Chris M. Orban, Juan J. Manfredi, Kyle D. Frische, Michael L. Dexter, Enam A. Chowdhury, Anil K. Patnaik
We present detailed characterization of laser-driven fusion and neutron production ($\sim {10}^5$/second) using 8 mJ, 40 fs laser pulses on a thin (<1 μm) D${}_2$O liquid sheet employing a measurement suite. At relativistic intensity ($\sim 5\times {10}^{18}$ W/cm${}^2$) and high repetition rate (1 kHz), the system produces deuterium–deuterium (D-D) fusion, allowing for consistent neutron generation
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Energy enhancement of laser-driven ions by radiation reaction and Breit–Wheeler pair production in the ultra-relativistic transparency regime High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-13 Shikha Bhadoria, Mattias Marklund, Christoph H. Keitel
The impact of radiation reaction and Breit–Wheeler pair production on the acceleration of fully ionized carbon ions driven by an intense linearly polarized laser pulse has been investigated in the ultra-relativistic transparency regime. Against initial expectations, the radiation reaction and pair production at ultra-high laser intensities are found to enhance the energy gained by the ions. The electrons
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A GHz chirped amplitude-modulated laser for high-contrast plasma gratings High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-13 Michael Valdman, Amir Hen, Gilad Marcus
The generation and control of large amplitude plasma gratings and other plasma structures is of paramount importance for the realization of plasma photonics. Autoresonant excitation of such structures by means of chirped amplitude-modulated lasers has been recently discussed and analyzed theoretically. Here we discuss the parameter space for the realization of such a scheme and describe the laser system
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Specifications and control of spatial frequency errors of components in two-beam laser static holographic exposure for pulse compression grating fabrication High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-13 Chen Hu, Songlin Wan, Guochang Jiang, Haojin Gu, Yibin Zhang, Yunxia Jin, Shijie Liu, Chengqiang Zhao, Hongchao Cao, Chaoyang Wei, Jianda Shao
The large-aperture pulse compression grating (PCG) is a critical component in generating an ultra-high-intensity, ultra-short-pulse laser; however, the size of the PCG manufactured by transmission holographic exposure is limited to large-scale high-quality materials. The reflective method is a potential way for solving the size limitation, but there is still no successful precedent due to the lack
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Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-11-06 Efim Khazanov
All space–time coupling effects arising in an asymmetric optical compressor consisting of two non-identical pairs of diffraction gratings are described analytically. In each pair, the gratings are identical and parallel to each other, whereas the distance between the gratings, the groove density and the angle of incidence are different in different pairs. It is shown that the compressor asymmetry does
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Supersonic gas jet stabilization in laser–plasma acceleration High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-10-31 Zhen-Zhe Lei, Yan-Jun Gu, Zhan Jin, Shingo Sato, Alexei Zhidkov, Alexandre Rondepierre, Kai Huang, Nobuhiko Nakanii, Izuru Daito, Masakai Kando, Tomonao Hosokai
Supersonic gas jets generated via a conical nozzle are widely applied in the laser wakefield acceleration of electrons. The stability of the gas jet is critical to the electron injection and the reproducibility of the wakefield acceleration. Here we discussed the role of the stilling chamber in a modified converging–diverging nozzle to dissipate the turbulence and to stabilize the gas jets. By the
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An interview with Gérard Mourou High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-10-02 Guoqing Chang, Yuanhao Mao
Gérard Mourou received his PhD from Pierre and Marie Curie University in 1973. He and his student Donna Strickland co-invented chirped pulse amplification (CPA) technology and shared the 2018 Nobel Prize in Physics. This technology made it possible to apply ultrafast lasers to many new areas, such as eye surgery, precision manufacturing, particle physics and nuclear fusion. Gérard Mourou is the founding
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Future for inertial-fusion energy in Europe: a roadmap High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-28 Dimitri Batani, Arnaud Colaïtis, Fabrizio Consoli, Colin N. Danson, Leonida Antonio Gizzi, Javier Honrubia, Thomas Kühl, Sebastien Le Pape, Jean-Luc Miquel, Jose Manuel Perlado, R. H. H. Scott, Michael Tatarakis, Vladimir Tikhonchuk, Luca Volpe
The recent achievement of fusion ignition with laser-driven technologies at the National Ignition Facility sets a historic accomplishment in fusion energy research. This accomplishment paves the way for using laser inertial fusion as a viable approach for future energy production. Europe has a unique opportunity to empower research in this field internationally, and the scientific community is eager
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Mitigation of stimulated Raman scattering in a high-power fiber master oscillator power amplifier laser based on a dual-structure fiber grating High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-27 Kerong Jiao, Qingqing Kong, Yangning Guo, Jingwei Li, Chen Wu, Zhigang Han, Rihong Zhu, Hua Shen
With the increasing power of fiber lasers, single chirped and tilted fiber Bragg gratings (CTFBGs) cannot completely mitigate continuously enhanced system-excited stimulated Raman scattering (SRS). Although improving the loss rate of a single CTFBG or cascading multiple CTFBGs can provide better suppression of the stronger SRS, excessive insertion loss may cause significant attenuation of the output
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Demonstration of a diode-pumped dual-wavelength metastable krypton laser High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-27 Qingshan Liu, Rui Wang, Zining Yang, Jianyong Sun, Weiqiang Yang, Hongyan Wang, Xiaojun Xu
Diode-pumped rare gas lasers are potential candidates for high-energy and high-beam quality laser systems. Currently, most investigations are focused on metastable Ar lasers. The Kr system has the unique advantages of higher quantum efficiency and lower discharge requirements for comparison. In this paper, a diode-pumped metastable Kr laser was demonstrated for the first time. Using a repetitively
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Experimental investigation of the stimulated Raman scattering effect in high-power nanosecond superfluorescent fiber source High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-27 Chaoyu Ning, Shuzhen Zou, Haijuan Yu, Jiexi Zuo, Xuechun Chen, Shuang Xu, Shifei Han, Xinyao Li, Wenjuan Wu, Chaojian He, Xuechun Lin
In this work, we experimentally investigate the dependence of the stimulated Raman scattering (SRS) effect on the seed linewidth of a high-power nanosecond superfluorescent fiber source (ns-SFS). The results reveal that the SRS in the ns-SFS amplifier is significantly influenced by the full width at half maximum (FWHM) of the ns-SFS seed, and there is an optimal FWHM linewidth of 2 nm to achieve the
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Extremely powerful and frequency-tunable terahertz pulses from a table-top laser–plasma wiggler High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-26 Jie Cai, Yinren Shou, Yixing Geng, Liqi Han, Xinlu Xu, Shuangchun Wen, Baifei Shen, Jinqing Yu, Xueqing Yan
The production of broadband, terawatt terahertz (THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets. However, the generation of extremely powerful, narrow-band and frequency-tunable THz pulses remains a challenge. Here, we present a novel approach for such THz pulses, in which a plasma wiggler is elaborated by a table-top laser and a near-critical density plasma.
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Beam shaping in the high-energy kW-class laser system Bivoj at the HiLASE facility High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-26 Tomáš Paliesek, Petr Navrátil, Jan Pilař, Martin Divoký, Martin Smrž, Tomáš Mocek
A fully automatic fail-safe beam shaping system based on a liquid crystal on a silicon spatial light modulator has been implemented in the high-energy kilowatt-average-power nanosecond laser system Bivoj. The shaping system corrects for gain nonuniformity and wavefront aberrations of the front-end of the system. The beam intensity profile and the wavefront at the output of the front-end were successfully
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Nanosecond laser conditioning of multilayer dielectric gratings for picosecond–petawatt laser systems High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-25 Kun Shuai, Yuanan Zhao, Xiaofeng Liu, Xiangkun Lin, Zhilin Xia, Keqiang Qiu, Dawei Li, He Gong, Yan Zhou, Jian Sun, Li Zhou, Youen Jiang, Yaping Dai, Jianda Shao
Multilayer dielectric gratings (MLDGs) are crucial for pulse compression in picosecond–petawatt laser systems. Bulged nodular defects, embedded in coating stacks during multilayer deposition, influence the lithographic process and performance of the final MLDG products. In this study, the integration of nanosecond laser conditioning (NLC) into different manufacturing stages of MLDGs was proposed for
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An interview with Vladimir Tikhonchuk High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-21 Ping Zhu
Vladimir Tikhonchuk, Professor Emeritus at Centre Lasers Intenses et Applications, University of Bordeaux, France, and senior researcher at the Extreme Light Infrastructure ERIC, ELI-Beamlines Facility, Czech Republic. His research is in the domain of high energy density physics and nonlinear optics, including inertial confinement fusion (ICF), dynamic processes in laboratory astrophysics, laser–plasma
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All- and mixed-dielectric grating for Nd:glass-based high-energy pulse compression High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-09-18 Yuxing Han, Hongchao Cao, Fanyu Kong, Yunxia Jin, Jianda Shao
Maximizing the energy-loading performance of gratings is a universal theme in high-energy pulse compression. However, sporadic grating designs strongly restrict the development of high-power laser engineering. This study proposes an all- and mixed-dielectric grating design paradigm for Nd:glass-based pulse compressors. The solution regions are classified according to the line density. High diffraction
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eXawatt Center for Extreme Light Studies High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-30 Efim Khazanov, Andrey Shaykin, Igor Kostyukov, Vladislav Ginzburg, Ivan Mukhin, Ivan Yakovlev, Alexander Soloviev, Ivan Kuznetsov, Sergey Mironov, Artem Korzhimanov, Denis Bulanov, Ilya Shaikin, Anton Kochetkov, Alexey Kuzmin, Mikhail Martyanov, Vladimir Lozhkarev, Mikhail Starodubtsev, Alexander Litvak, Alexander Sergeev
The eXawatt Center for Extreme Light Studies project aimed to create a large scientific infrastructure based on lasers with giant peak power. The project relies on the significant progress achieved in the last decade. The planned infrastructure will incorporate a unique light source with a pulse power of 600 PW using optical parametric chirped pulse amplification in large-aperture KD2PO4, deuterated
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All-optical nonlinear chiral ultrafast magnetization dynamics driven by circularly polarized magnetic fields High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-29 Luis Sánchez-Tejerina, Rodrigo Martín-Hernández, Rocío Yanes, Luis Plaja, Luis López-Díaz, Carlos Hernández-García
Ultrafast laser pulses provide unique tools to manipulate magnetization dynamics at femtosecond timescales, where the interaction of the electric field usually dominates over the magnetic field. Recent proposals using structured laser beams have demonstrated the possibility to produce regions where intense oscillating magnetic fields are isolated from the electric field. In these conditions, we show
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Kilowatt-level supercontinuum generation in a single-stage random fiber laser with a half-open cavity High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-29 Li Jiang, Jinming Wu, Rui Song, Zilun Chen, Xiran Zhu, Fengchang Li, Kailong Li, Hanwei Zhang, Jing Hou
The random distributed-feedback fiber laser (RFL) is a new approach to obtain a high-power stable supercontinuum (SC) source. To consider both structure simplification and high-power SC output, an innovative structure achieving a kilowatt-level SC output in a single-stage RFL with a half-open cavity is demonstrated in this paper. It consists of a fiber oscillator, a piece of long passive fiber and
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Competition among the two-plasmon decay of backscattered light, filamentation of the electron-plasma wave and side stimulated Raman scattering High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-29 K. Q. Pan, Z. C. Li, L. Guo, T. Gong, S. W. Li, D. Yang, C. Y. Zheng, B. H. Zhang, X. T. He
Competition among the two-plasmon decay (TPD) of backscattered light of stimulated Raman scattering (SRS), filamentation of the electron-plasma wave (EPW) and forward side SRS is investigated by two-dimensional particle-in-cell simulations. Our previous work [K. Q. Pan et al., Nucl. Fusion 58, 096035 (2018)] showed that in a plasma with the density near 1/10 of the critical density, the backscattered
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A 115 ps, 100 Hz high-beam-quality laser based on transient stimulated Brillouin scattering pulse compression High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-29 Jianfeng Yue, Yulei Wang, Mengyu Jia, Kai Li, Chen Cao, Yu Yu, Yunfei Li, Zhiwei Lü
This work demonstrates the generation of short pulse duration and high-beam-quality laser pulses using transient stimulated Brillouin scattering at a high repetition rate. Thermal effects and optical breakdown are identified as the main factors that restrict energy reflectivity and beam quality under high repetition rates and transient situations. Through experimental analysis, the interaction length
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Simple, stable and efficient nonlinear pulse compression through cascaded filamentation in air High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-22 Tao Pu, Kan Tian, Bo Hu, Zhongjun Wan, Linzhen He, Xuemei Yang, Han Wu, Yang Li, Weizhe Wang, Houkun Liang
Nonlinear compression has become an obligatory technique along with the development of ultrafast lasers in generating ultrashort pulses with narrow pulse widths and high peak power. In particular, techniques of nonlinear compression have experienced a rapid progress as ytterbium (Yb)-doped lasers with pulse widths in the range from hundreds of femtoseconds to a few picoseconds have become mainstream
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High-power free-running single-longitudinal-mode diamond Raman laser enabled by suppressing parasitic stimulated Brillouin scattering High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-15 Yuxuan Liu, Chengjie Zhu, Yuxiang Sun, Richard P. Mildren, Zhenxu Bai, Baitao Zhang, Weibiao Chen, Dijun Chen, Muye Li, Xuezong Yang, Yan Feng
A continuous-wave (CW) single-longitudinal-mode (SLM) Raman laser at 1240 nm with power of up to 20.6 W was demonstrated in a free-running diamond Raman oscillator without any axial-mode selection elements. The SLM operation was achieved due to the spatial-hole-burning free nature of Raman gain and was maintained at the highest available pump power by suppressing the parasitic stimulated Brillouin
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Thulium-doped all-PM fiber chirped pulse amplifier delivering 314 W average power High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-14 Bo Ren, Can Li, Tao Wang, Kun Guo, Jian Wu, Pu Zhou
A high-power all polarization-maintaining (PM) chirped pulse amplification (CPA) system operating in the 2.0 μm range is experimentally demonstrated. Large mode area (LMA) thulium-doped fiber (TDF) with a core/cladding diameter of 25/400 μm is employed to construct the main amplifier. Through dedicated coiling and cooling of the LMA-TDF to manage the loss of the higher order mode and thermal effect
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High-energy and high-peak-power GHz burst-mode all-fiber laser with a uniform envelope and tunable intra-burst pulses High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-09 Shuailin Liu, Bin Zhang, Yuanzhuang Bu, Desheng Zhao, Xiran Zhu, Linyong Yang, Jing Hou
We report a Yb-doped all-fiber laser system generating burst-mode pulses with high energy and high peak power at a GHz intra-burst repetition rate. To acquire the uniform burst envelope, a double-pre-compensation structure with an arbitrary waveform laser diode driver and an acoustic optical modulator is utilized for the first time. The synchronous pumping is utilized for the system to reduce the burst
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Prospects for statistical tests of strong-field quantum electrodynamics with high-intensity lasers High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-08-01 C. Olofsson, A. Gonoskov
Exploiting high-energy electron beams colliding into high-intensity laser pulses brings an opportunity to reach high values of the dimensionless rest-frame acceleration $\chi$ and thereby invoke processes described by strong-field quantum electrodynamics (SFQED). Measuring deviations from the results of Furry-picture perturbation theory in SFQED at high $\chi$ can be valuable for testing existing predictions
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Zernike-coefficient extraction via helical beam reconstruction for optimization (ZEHBRO) in the far field High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-31 J. B. Ohland, D. Posor, U. Eisenbarth, V. Iancu, R. Ungureanu, D. Ursescu, V. Bagnoud
The spatial distribution of beams with orbital angular momentum in the far field is known to be extremely sensitive to angular aberrations, such as astigmatism, coma and trefoil. This poses a challenge for conventional beam optimization strategies when a homogeneous ring intensity is required for an application. We developed a novel approach for estimating the Zernike coefficients of low-order angular
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Kilowatt-class high-energy frequency conversion to 95 J at 10 Hz at 515 nm High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-27 Martin Divoky, Jonathan Phillips, Jan Pilar, Martin Hanus, Petr Navratil, Ondrej Denk, Tomas Paliesek, Patricie Severova, Danielle Clarke, Martin Smrz, Thomas Butcher, Chris Edwards, John Collier, Tomas Mocek
We report on frequency doubling of high-energy, high repetition rate ns pulses from a cryogenically gas cooled multi-slab ytterbium-doped yttrium aluminum garnet laser system, Bivoj/DiPOLE, using a type-I phase matched lithium triborate crystal. We achieved conversion to 515 nm with energy of 95 J at repetition rate of 10 Hz and conversion efficiency of 79%. High conversion efficiency was achieved
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Measurements of plasma density profile evolutions with a channel-guided laser High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-24 Tong Yang, Zhen Guo, Yang Yan, Minjian Wu, Yadong Xia, Qiangyou He, Hao Cheng, Yuze Li, Yanlv Fang, Yanying Zhao, Xueqing Yan, Chen Lin
The discharged capillary plasma channel has been extensively studied as a high-gradient particle acceleration and transmission medium. A novel measurement method of plasma channel density profiles has been employed, where the role of plasma channels guiding the advantages of lasers has shown strong appeal. Here, we have studied the high-order transverse plasma density profile distribution using a channel-guided
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X-ray diffraction performance of thermally distorted crystals High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-05 Chuan Yang, Tao Liu, Kai Hu, Ye Zhu, Xiaohao Dong, Zhongmin Xu, Chao Feng, Weiqing Zhang
The development of high-brightness X-ray free electron lasers (XFELs), such as hard X-ray self-seeding free electron lasers and XFEL oscillators (XFELOs), brings a severe challenge to the crystal monochromator due to a strong non-uniform thermal load. The distortion caused by spatial temperature gradients can severely affect the optical performance of crystals. Therefore, this paper presents a model
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Spatiotemporally mode-locked soliton fiber laser at 2.8 μm High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-05 Ying’an Chen, Yicheng Zhou, Zhipeng Qin, Guoqiang Xie, Peng Yuan, Jingui Ma, Liejia Qian
Spatiotemporal mode-locking creates great opportunity for pulse energy scaling and nonlinear optics research in fiber. Until now, spatiotemporal mode-locking has only been realized in normal-dispersion dissipative soliton and similariton fiber lasers. In this paper, we demonstrated the first experimental realization of a spatiotemporally mode-locked soliton laser in mid-infrared fluoride fiber with
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OCTOPOD: single-bunch tomography for angular-spectral characterization of laser-driven protons High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-04 M. Reimold, S. Assenbaum, E. Beyreuther, E. Bodenstein, F.-E. Brack, C. Eisenmann, F. Englbrecht, F. Kroll, F. Lindner, U. Masood, J. Pawelke, U. Schramm, M. Schneider, M. Sobiella, M. E. P. Umlandt, M. Vescovi, K. Zeil, T. Ziegler, J. Metzkes-Ng
Laser–plasma accelerated (LPA) proton bunches are now applied for research fields ranging from ultra-high-dose-rate radiobiology to material science. Yet, the capabilities to characterize the spectrally and angularly broad LPA bunches lag behind the rapidly evolving applications. The OCTOPOD translates the angularly resolved spectral characterization of LPA proton bunches into the spatially resolved
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High-energy, alignment-insensitive, injection-seeded Q-switched Ho:yttrium aluminum garnet single-frequency laser High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-07-04 Dong Yan, Yue Yuan, Yunpeng Wang, Jiawei Fan, Jiaze Wu, Xiaoming Duan, Sining Li, Tongyu Dai, Youlun Ju
A high-energy, alignment-insensitive, injection-seeded Q-switched Ho:yttrium aluminum garnet (YAG) single-frequency laser is developed. Both the slave Q-switched laser and the seed laser are Ho:YAG ring lasers based on a pair of corner cubic reflectors. The seed laser has an available power of 830 mW at 2096.667 nm. At 100 Hz, the Q-switched Ho:YAG laser provides a single-frequency pulsed output using
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Accelerated protons with energies up to 70 MeV based on the optimized SG-II Peta-watt laser facility High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-30 H. H. An, W. Wang, J. Xiong, C. Wang, X. Pan, X. P. Ouyang, S. Jiang, Z. Y. Xie, P. P. Wang, Y. L. Yao, N. Hua, Y. Wang, Z. C. Jiang, Q. Xiao, F. C. Ding, Y. T. Wan, X. Liu, R. R. Wang, Z. H. Fang, P. Q. Yang, Y. E. Jiang, P. Z. Zhang, B. Q. Zhu, J. R. Sun, B. Qiao, A. L. Lei, J. Q. Zhu
The target backsheath field acceleration mechanism is one of the main mechanisms of laser-driven proton acceleration (LDPA) and strongly depends on the comprehensive performance of the ultrashort ultra-intense lasers used as the driving sources. The successful use of the SG-II Peta-watt (SG-II PW) laser facility for LDPA and its applications in radiographic diagnoses have been manifested by the good
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Spectral purity systems applied for laser-produced plasma extreme ultraviolet lithography sources: a review High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-23 Nan Lin, Yunyi Chen, Xin Wei, Wenhe Yang, Yuxin Leng
With the development of high-volume manufacturing for very-large-scale integrated circuits, the purity of the light source in the extreme ultraviolet lithography (EUVL) system needs to fulfil extreme requirements in order to avoid thermal effect, optical distortion and critical dimension errors caused by out-of-band radiations. This paper reviews the key technologies and developments of the spectral
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Laser chirp controlled relativistic few-cycle mid-infrared pulse generation High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-23 Dongao Li, Guobo Zhang, Jie Zhao, Yanting Hu, Yu Lu, Hao Zhang, Qianni Li, Dongze Zhang, Rong Sha, Fuqiu Shao, Zhengming Sheng, Tongpu Yu
Relativistic few-cycle mid-infrared (mid-IR) pulses are unique tools for strong-field physics and ultrafast science, but are difficult to generate with traditional nonlinear optical methods. Here, we propose a scheme to generate such pulses with high efficiency via plasma-based frequency modulation with a negatively chirped laser pulse (NCLP). The NCLP is rapidly compressed longitudinally due to dispersion
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Optical rectification in 4H-SiC: paving the way to generate strong terahertz fields with ultra-wide bandwidth High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-20 Fangjie Li, Kai Zhong, Yiwen Zhang, Tong Wu, Yuxin Liu, Hongzhan Qiao, Jining Li, Degang Xu, Jianquan Yao
The 4H-SiC crystal is found to have great potential in terahertz generation via nonlinear optical frequency conversion due to its extremely high optical damage threshold, wide transparent range, etc. In this paper, optical rectification (OR) with tilted-pulse-front (TPF) setting based on the 4H-SiC crystal is proposed. The theory accounts for the optimization of incident pulse pre-chirping in the TPF
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Control systems and data management for high-power laser facilities High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-15 Scott Feister, Kevin Cassou, Stephen Dann, Andreas Döpp, Philippe Gauron, Anthony J. Gonsalves, Archis Joglekar, Victoria Marshall, Olivier Neveu, Hans-Peter Schlenvoigt, Matthew J. V. Streeter, Charlotte A. J. Palmer
The next generation of high-power lasers enables repetition of experiments at orders of magnitude higher frequency than what was possible using the prior generation. Facilities requiring human intervention between laser repetitions need to adapt in order to keep pace with the new laser technology. A distributed networked control system can enable laboratory-wide automation and feedback control loops
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Modeling of transverse stimulated Raman scattering in KDP/DKDP in large-aperture plates suitable for polarization control High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-14 Hu Huang, Tanya Z. Kosc, Terrance J. Kessler, Stavros G. Demos
Transverse stimulated Raman scattering (TSRS) in potassium dihydrogen phosphate (KDP) and deuterated potassium dihydrogen phosphate (DKDP) plates for large-aperture, inertial confinement fusion (ICF)-class laser systems is a well-recognized limitation giving rise to parasitic energy conversion and laser-induced damage. The onset of TSRS is manifested in plates exposed to the ultraviolet section of
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Timing fluctuation correction for the front end of a 100-PW laser High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-13 Hongyang Li, Keyang Liu, Xinliang Wang, Xingyan Liu, Xianze Meng, Yanqi Liu, Liwei Song, Yuxin Leng, Ruxin Li
The development of high-intensity ultrafast laser facilities provides the possibility to create novel physical phenomena and matter states. The timing fluctuation of the laser pulses is crucial for pump–probe experiments, which is one of the vital means to observe the ultrafast dynamics driven by intense laser pulses. In this paper, we demonstrate the timing fluctuation characterization and control
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Linewidth narrowing in free-space-running diamond Brillouin lasers High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-06 Duo Jin, Zhenxu Bai, Zhongan Zhao, Yifu Chen, Wenqiang Fan, Yulei Wang, Richard P. Mildren, Zhiwei Lü
This study analyzes the linewidth narrowing characteristics of free-space-running Brillouin lasers and investigates the approaches to achieve linewidth compression and power enhancement simultaneously. The results show that the Stokes linewidth behavior in a free-space-running Brillouin laser cavity is determined by the phase diffusion of the pump and the technical noise of the system. Experimentally
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High-power mid-infrared femtosecond master oscillator power amplifier Er:ZBLAN fiber laser system High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-06-01 Linpeng Yu, Jinhui Liang, Qinghui Zeng, Jiacheng Wang, Xing Luo, Jinzhang Wang, Peiguang Yan, Fanlong Dong, Xing Liu, Qitao Lü, Chunyu Guo, Shuangchen Ruan
High-power femtosecond mid-infrared (MIR) lasers are of vast importance to both fundamental research and applications. We report a high-power femtosecond master oscillator power amplifier laser system consisting of a single-mode Er:ZBLAN fiber mode-locked oscillator and pre-amplifier followed by a large-mode-area Er:ZBLAN fiber main amplifier. The main amplifier is actively cooled and bidirectionally
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Data-driven science and machine learning methods in laser–plasma physics High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-30 Andreas Döpp, Christoph Eberle, Sunny Howard, Faran Irshad, Jinpu Lin, Matthew Streeter
Laser-plasma physics has developed rapidly over the past few decades as lasers have become both more powerful and more widely available. Early experimental and numerical research in this field was dominated by single-shot experiments with limited parameter exploration. However, recent technological improvements make it possible to gather data for hundreds or thousands of different settings in both
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Phase imaging of irradiated foils at the OMEGA EP facility using phase-stepping X-ray Talbot–Lau deflectometry High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-26 G. Pérez-Callejo, V. Bouffetier, L. Ceurvorst, T. Goudal, S. R. Klein, D. Svyatskiy, M. Holec, P. Perez-Martin, K. Falk, A. Casner, T. E. Weber, G. Kagan, M. P. Valdivia
Diagnosing the evolution of laser-generated high energy density (HED) systems is fundamental to develop a correct understanding of the behavior of matter under extreme conditions. Talbot–Lau interferometry constitutes a promising tool, since it permits simultaneous single-shot X-ray radiography and phase-contrast imaging of dense plasmas. We present the results of an experiment at OMEGA EP that aims
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X-ray polarimetry and its application to strong-field quantum electrodynamics High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-25 Qiqi Yu, Dirui Xu, Baifei Shen, Thomas E. Cowan, Hans-Peter Schlenvoigt
Polarimetry is a highly sensitive method to quantify changes of the polarization state of light when passing through matter and is therefore widely applied in material science. The progress of synchrotron and X-ray free electron laser (XFEL) sources has led to significant developments of X-ray polarizers, opening perspectives for new applications of polarimetry to study source and beamline parameters
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Effect of subsurface impurity defects on laser damage resistance of beam splitter coatings High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-25 Wenyun Du, Meiping Zhu, Jun Shi, Tianbao Liu, Jian Sun, Kui Yi, Jianda Shao
The laser-induced damage threshold (LIDT) of plate laser beam splitter (PLBS) coatings is closely related to the subsurface absorption defects of the substrate. Herein, a two-step deposition temperature method is proposed to understand the effect of substrate subsurface impurity defects on the LIDT of PLBS coatings. Firstly, BK7 substrates are heat-treated at three different temperatures. The surface
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Generation of a curved plasma channel from a discharged capillary for intense laser guiding High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-25 Jian-Long Li, Bo-Yuan Li, Xin-Zhe Zhu, Ze-Wu Bi, Xin-Hui Wen, Lin Lu, Xiao-Hui Yuan, Feng Liu, Min Chen
Straightplasma channels are widely used to guide relativistic intense laser pulses over several Rayleigh lengths for laser wakefield acceleration. Recently, a curved plasma channel with gradually varied curvature was suggested to guide a fresh intense laser pulse and merge it into a straight channel for staged wakefield acceleration [Phys. Rev. Lett. 120, 154801 (2018)]. In this work, we report the
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Nonlinear chirped pulse amplification for a 100-W-class GHz femtosecond all-fiber laser system at 1.5 m High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-05-25 Yiheng Fan, Hao Xiu, Wei Lin, Xuewen Chen, Xu Hu, Wenlong Wang, Junpeng Wen, Hao Tian, Molei Hao, Chiyi Wei, Luyi Wang, Xiaoming Wei, Zhongmin Yang
In this work, we present a high-power, high-repetition-rate, all-fiber femtosecond laser system operating at 1.5 $\unicode{x3bc}$m. This all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz with an average output power of 106.4 W – the highest average power reported so far from an all-fiber femtosecond laser at 1.5 $\unicode{x3bc}$m, to the best of our
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Inertial confinement fusion ignition achieved at the National Ignition Facility – an editorial High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-04-27 C. N. Danson, L. A. Gizzi
On behalf of all at High Power Laser Science and Engineering we would like to congratulate the team at Lawrence Livermore National Laboratory (LLNL) on demonstrating fusion ignition at the National Ignition Facility. This major scientific achievement was realized on the 5 December 2022 at the LLNL and announced at a press briefing on the 13 December 2022 by the United States Department of Energy’s
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Laser pulse shape designer for direct-drive inertial confinement fusion implosions High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-04-26 Tao Tao, Guannan Zheng, Qing Jia, Rui Yan, Jian Zheng
Pulse shaping is a powerful tool for mitigating implosion instabilities in direct-drive inertial confinement fusion (ICF). However, the high-dimensional and nonlinear nature of implosions makes the pulse optimization quite challenging. In this research, we develop a machine-learning pulse shape designer to achieve high compression density and stable implosion. The facility-specific laser imprint pattern
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Monitoring and characterization of particle contamination in the pulse compression chamber of the OMEGA EP laser system High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-04-20 B. N. Hoffman, N. Savidis, S. G. Demos
The laser-damage performance of optics is known to be negatively affected by microscale particle contamination induced by the operational environment. This work investigates the properties of particles accumulating in various locations near critical optics inside the OMEGA EP grating compressor chamber during quarterly operational periods over a 2-year duration. The particles found were characterized
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Synchronous post-acceleration of laser-driven protons in helical coil targets by controlling the current dispersion High Power Laser Sci. Eng. (IF 4.8) Pub Date : 2023-04-18 Zhipeng Liu, Zhusong Mei, Defeng Kong, Zhuo Pan, Shirui Xu, Ying Gao, Yinren Shou, Pengjie Wang, Zhengxuan Cao, Yulan Liang, Ziyang Peng, Jiarui Zhao, Shiyou Chen, Tan Song, Xun Chen, Tianqi Xu, Xueqing Yan, Wenjun Ma
Post-acceleration of protons in helical coil targets driven by intense, ultrashort laser pulses can enhance ion energy by utilizing the transient current from the targets’ self-discharge. The acceleration length of protons can exceed a few millimeters, and the acceleration gradient is of the order of GeV/m. How to ensure the synchronization between the accelerating electric field and the protons is