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High-sensitivity fiber optic graphene resonant accelerometer Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Yujian Liu, Cheng Li, Jing Li, Zhen Wan, and Shangchun Fan
This study proposes a high-sensitivity resonant graphene accelerometer based on a pressure-induced sensing mechanism. The accelerometer design encompasses an optical fiber and a vacuum-sealed graphene resonator affixed to a silicon sensitive film, incorporating a proof mass. This indirect sensing mechanism effectively mitigates the vibration mode aliasing of graphene and the proof mass while ensuring
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Integrated approach for simultaneously measuring thermophysical parameters of semi-transparent materials Opt. Lett. (IF 3.6) Pub Date : 2024-03-27 Yanfen Xu, Kaihua Zhang, Kun Yu, and Yufang Liu
To concurrently determine the thermophysical parameters of semi-transparent materials, a novel, to the best of our knowledge, integrated approach for concurrent measurement is proposed. In the measurement setup, a high-temperature radiation source and a beam reducer are employed to minimize the influence of background radiation. In order to differentiate between the transmitted and emitted radiation
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Vectorial holography over a multimode fiber Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Haotian Liu, Jianwei Ye, Pengbai Xu, Leiming Wu, Yi Xu, and Yuwen Qin
Vectorial holography through a strongly scattering medium can facilitate various applications in optics and photonics. However, the realization of vectorial holography with arbitrary distribution of optical intensity is still limited because of experimental noise during the calibration of vectorial transmission matrix (TM) and reconstruction noise during the retrieval of input wavefront for a given
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Dalton’s law of partial optical thermodynamic pressures in highly multimoded nonlinear photonic systems Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Huizhong Ren, Georgios G. Pyrialakos, Fan O. Wu, Nikolaos K. Efremidis, Mercedeh Khajavikhan, and Demetrios N. Christodoulides
We show that in highly multimoded nonlinear photonic systems, the optical thermodynamic pressures emerging from different species of the optical field obey Dalton’s law of partial pressures. In multimode settings, the optical thermodynamic pressure is defined as the conjugate to the extensive variable associated with the system’s total number of modes and is directly related to the actual electrodynamic
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Ultra-broadband TM-pass polarizer based on anisotropic metamaterials in lithium niobate on an insulator Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Xu Han, Rui Cheng, Liang Huang, Panpan Yu, Lantian Feng, Guanghui Ren, Arnan Mitchell, Yonghui Tian, Xifeng Ren, and Haojie Xia
An ultra-broadband TM-pass polarizer is designed, fabricated, and experimentally demonstrated based on subwavelength grating (SWG) metamaterials in a lithium niobate on an insulator (LNOI) platform. According to our simulation, the designed device is predicted to work at a 220 nm wavelength range from 1460 to 1680 nm, covering the S-, C-, L-, U-bands of optical fiber communication. By depositing and
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Integrated visible-light polarization rotators and splitters for atomic quantum systems Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Ashton Hattori, Tal Sneh, Milica Notaros, Sabrina Corsetti, Patrick T. Callahan, Dave Kharas, Thomas Mahony, Robert McConnell, John Chiaverini, and Jelena Notaros
In this work, we design and experimentally demonstrate the first, to the best of our knowledge, integrated polarization splitters and rotators at blue wavelengths. We develop compact and efficient designs for both a polarization splitter and rotator at a 422-nm wavelength, an important laser-cooling transition for 88Sr+ ions. These devices are fabricated in a 200-mm wafer-scale process and experimentally
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All-solid-state 3-µm single-frequency Er:CaF2 laser with a stable and switchable wavelength Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Mengyu Zong, Zhen Zhang, Jingjing Liu, Jie Liu, and Liangbi Su
We have demonstrated a 3-µm all-solid-state single-frequency laser with a stable center frequency and a switchable wavelength using the intra-cavity Fabry–Perot etalon method. Experimentally, the central wavelengths of the laser for the single-longitudinal mode are 2728 and 2794 nm, with maximum output powers of 268 and 440 mW, respectively. The corresponding single-longitudinal mode linewidths are
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Broadband chaos generation in a distributed-feedback laser by selecting residual side modes Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Luan Zhang and Sze-Chun Chan
Chaotic dynamics with spectral broadening is experimentally obtained by selective excitation of residual side modes in a distributed-feedback (DFB) laser. For the single-mode laser that emits only at the main mode when free-running, feedback to a residual side mode is introduced via a fiber Bragg grating (FBG). The FBG feedback suppresses the main mode, selectively excites the residual side mode, and
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Topological corner state localized bound states in continuum in photonic crystals Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Zhenbin Zhang, Banxian Ruan, Enduo Gao, Chao Liu, and Hongjian Li
In the field of optics, bound states in the continuum (BICs) are of significant practical importance as they can trap electromagnetic waves spatially, even though their frequency lies within the continuous spectrum. Previous research, however, has shown that BICs localized in optical cavities are highly sensitive to geometric and environmental changes. This sensitivity implies that slight variations
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Nonlinear-mirror mode-locked crystal waveguide laser by intracavity fourth-harmonic loss modulation: publisher’s note Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Guotai Li, Jiakun Han, Shuai Li, Jing Zhao, Zhanda Zhu, Yongling Hui, Hong Lei, and Qiang Li
This publisher’s note contains a correction to Opt. Lett. 48, 6064 (2024) [CrossRef] .
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Technique for enhancing the accuracy of the Rayleigh–Sommerfeld convolutional diffraction through the utilization of independent spatial sampling: publisher’s note Opt. Lett. (IF 3.6) Pub Date : 2024-03-26 Wanli Zhao, Jing Lu, Jun Ma, Caojin Yuan, Chenliang Chang, and Rihong Zhu
This publisher’s note contains a correction to Opt. Lett. 49, 1385 (2024) [CrossRef] .
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EO nonlinear function generator Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Zhangqi Dang, Zeyu Deng, Tao Chen, Zhenming Ding, and Ziyang Zhang
An electro-optical programmable nonlinear function generator (PNFG) is developed on a multimode waveguide with four parallel thermal electrodes. The current on one electrode is chosen as the input, while the rest serve as function-defining units to modulate the multimode interference. The electro-thermo-optical effects are analyzed step by step and the impact on the eigenmode properties is derived
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Scan-less 3D microscopy based on spatiotemporal encoding on a single-cavity dual-comb laser Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Wanping Lu, Zhiwei Zhu, Benjamin Willenberg, Justinas Pupeikis, Christopher R. Phillips, Ursula Keller, and Shih-chi Chen
Dual-comb microscopy enables high-speed and high-precision optical sampling by simultaneously extracting both amplitude and phase information from the interference signals with frequency division multiplexing. In this Letter, we introduce a spatiotemporal encoding approach for dual-comb microscopy that overcomes previous limitations such as mechanical scanning, low sampling efficiency, and system complexity
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Regulation of laser-induced nanogratings by tuning the Marangoni-plasmon-coupled effect Opt. Lett. (IF 3.6) Pub Date : 2024-03-25 Kang Xu, Lingyu Huang, Xuanzheng Zhou, Mandong Zheng, Min Wang, and Shaoin Xu
Laser-induced subwavelength nanogratings on films find widespread applications in enhancing a spectrum through surface plasmon excitation. It is challenging to achieve high uniformity, diversity, and controllability due to the intricate interplay between two basic mechanisms in laser nanostructuring: the Marangoni effect and surface plasmon polaritons (SPPs). We tune the coupled effect on Ge2Sb2Te5
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Vibration-insensitive polarimetric fiber optic current sensor based on orbital angular momentum modes in an air-core optical fiber Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Lina Xiang, Fufei Pang, Zhongyin Xiao, Liang Zhang, Heming Wei, Mengshi Zhu, Siddharth Ramachandran, and Tingyun Wang
Current or magnetic field sensing is usually achieved by exploiting the Faraday effect of an optical material combined with an interferometric probe that provides the sensitivity. Being interferometric in nature, such sensors are typically sensitive to several other environmental parameters such as vibrations and mechanical disturbances, which, however, inevitably impose the inaccuracy and instability
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Enhanced evanescent field via integration of a graphene oxide/poly(methyl methacrylate) hybrid film on coreless D-shaped fibers Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Bing Sun, Kai Wan, Kaiming Zhou, Zhendong Huang, and Zuxing Zhang
This study presents the implementation of an evanescent field (EF)-based sensing platform employing a hybrid film composed of graphene oxide (GO) and poly(methyl methacrylate) (PMMA), integrated onto coreless D-shaped fibers (cDsFs). The operational framework of the hybrid film-coated cDsFs (GoP-cDsFs) was comprehensively elucidated through theoretical and experimental analyses. To establish a baseline
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Dissipative three-dimensional topological optical solitons with crossed localization of polarization components Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Nikolay Veretenov, Sergey Fedorov, and Nikolay Rosanov
We present a new, to the best of our knowledge, type of vector three-dimensional dissipative optical solitons with more extended degrees of freedom in a laser or laser medium with saturable absorption. These solitons are reconfigurable, include polarization singularities, and have various mutual orientations of nearly toroidal localization domains of polarization components. Numerical modeling confirms
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Tunable and highly sensitive fluorescent thermometers from La2CaZrO6:Cr3+ with a time-resolved technology Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Ganggang Guo, Qiong Xi, Cong Li, Tao Yin, Zheng Ren, Yayuan Zhang, Jianju Nie, Li Guan, Zhenyang Liu, Fenghe Wang, and Xu Li
Non-contact optical temperature measurement can effectively avoid the disadvantages of traditional contact thermometry and thus, become a hot research topic. Herein, a fluorescence intensity ratio (FIR) thermometry using a time-resolved technique based on La2CaZrO6:Cr3+ (LCZO) is proposed, with a maximum relative sensitivity (Sr − FIR) of 2.56% K−1 at 473 K and a minimum temperature resolution of 0
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Research on the phase error of a Sagnac interferometer induced by modulation of a multifunctional integrated optical modulator Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Q. H. Wang, X. W. Shu, and Ran Bi
High-precision IFOG requires an optical sensitivity of up to 10−8 rads−1 for interferometers; noise and error are two of the main reasons limiting its accuracy improvement. Any potential source of the signal error is worth being studied. This article introduces work on the modulation signal error caused by the mechanical vibration energy loss of MIOC crystals. This article theoretically derives and
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Observation of quantum-correlated twin beams in cascaded nonlinear interactions Opt. Lett. (IF 3.6) Pub Date : 2024-03-21 Salvatore Castrignano, Iolanda Ricciardi, Pasquale Maddaloni, Paolo De Natale, Stefan Wabnitz, and Maurizio De Rosa
We report on the generation of twin beams through a cascaded process of optical parametric oscillation in a doubly resonant second-harmonic generation system. These bright beams exhibit strong quantum correlations, enabling the observation of up to 5 dB of noise reduction in their intensity difference below the standard quantum limit.
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Mobile recognition and positioning for multiple visible light communication cells using a convolutional neural network: publisher’s note Opt. Lett. (IF 3.6) Pub Date : 2024-03-22 Xiaoxiao Du, Yanyu Zhang, Chao Wang, Penghui Fan, and Yijun Zhu
This publisher’s note contains a correction to Opt. Lett. 48, 6468 (2024) [CrossRef] .
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Widefield functional speckle-correlation optical scattering mesoscopy toward hemodynamic imaging Opt. Lett. (IF 3.6) Pub Date : 2024-03-21 Ruifeng Zhang, Liang Fei, Xiangru Liu, Yunxu Sun, Xiaochuan Xu, Shutian Liu, Zhengjun Liu, Lingji Xu, and Wei Liu
Speckle-correlation optical scattering imaging (SCOSI) has shown the potential for non-invasive biomedical diagnostic applications, which directly utilizes the scattering patterns to reconstruct the deep and non-line-of-sight objects. However, the course of the translation of this technique to preclinical biomedical imaging applications has been postponed by the following two facts: 1) the field of
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Joule-class THz pulses from microchannel targets Opt. Lett. (IF 3.6) Pub Date : 2024-03-21 G. Bruhaug, H. G. Rinderknecht, K. Weichman, M. VanDusen-Gross, J. P. Palastro, M. S. Wei, S. P. Regan, Y. E, K. Garriga, X.-C. Zhang, G. W. Collins, and J. R. Rygg
Inference of joule-class THz radiation sources from microchannel targets driven with hundreds of joule, picosecond lasers is reported. THz sources of this magnitude are useful for nonlinear pumping of matter and for charged-particle acceleration and manipulation. Microchannel targets demonstrate increased laser–THz conversion efficiency compared to planar foil targets, with laser energy to THz energy
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Octave soliton microcombs in lithium niobate microresonators Opt. Lett. (IF 3.6) Pub Date : 2024-03-21 Pi-Yu Wang, Shuai Wan, Rui Ma, Wei Li, Fang Bo, Guang-Can Guo, and Chun-Hua Dong
Soliton microcombs are regarded as an ideal platform for applications such as optical communications, optical sensing, low-noise microwave sources, optical atomic clocks, and frequency synthesizers. Many of these applications require a broad comb spectrum that covers an octave, essential for implementing the f − 2f self-referencing techniques. In this work, we have successfully generated an octave-spanning
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Ultrafast laser bursts welding glass and metal with solder paste to create an ultra-large molten pool Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Haodong Ren, Chenyun Tian, and Hong Shen
A novel, to our knowledge, method is proposed for the welding of glass and metal with a large gap filled with solder paste using ultrafast laser bursts. The addition of solder paste enables a reliable glass–metal connection even at gaps of hundreds of microns, while the position of the glass can be flexibly adjusted. By ultrafast laser bursts, the volume of the molten pool increases significantly,
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Thermal-tagging photoacoustic remote sensing flowmetry Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Yun Lu, Yunxu Sun, Zhousheng Shen, Xiaochuan Xu, Ting Ma, Chang Peng, Fenfang Li, Chengqing Ning, Jiawei Wang, Shutian Liu, Zhengjun Liu, Lingji Xu, and Wei Liu
Ultrasound coupling is one of the critical challenges for traditional photoacoustic (or optoacoustic) microscopy (PAM) techniques transferred to the clinical examination of chronic wounds and open tissues. A promising alternative potential solution for breaking the limitation of ultrasound coupling in PAM is photoacoustic remote sensing (PARS), which implements all-optical non-interferometric photoacoustic
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Spectrally resolved nonlinearities within a laser pulse in a single-scan and spectrometer-based nonlinear optical probing Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Jitendra Nath Acharyya, Albin Kuriakose, and G. Vijaya Prakash
The intricate spectrally resolved optical nonlinearities resulting from a spectrally broad femtosecond Gaussian laser pulse have been unraveled using a single-scan and spectrometer-based nonlinear optical probing technique. The interaction of the broad femtosecond laser pulse with a strongly absorbing organic dye has unveiled a remarkably distinct nonlinear absorption behavior across the broad spectral
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Bifocal photon sieve imaging in the hard x-ray region Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Xiaojun Bai, Junyong Zhang, Huiya Liu, and Cheng Liu
Hard x-rays are widely used for plasma diagnosis, nondestructive inspection, and high-resolution x-ray imaging. A typical x-ray source is a tabletop micro-focus x-ray source. Here, a bifocal photon sieve (PS) with the smallest diameter of 59.6 nm was designed and fabricated by electron-beam lithography to focus hard x-rays on variable-resolution array images. An imaging experiment at 8.39 keV demonstrates
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Nanoscale surface metrology with a liquid crystal-based phase-shifting angular shearing interferometer Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Debasish Bag, Susanta Chakraborty, and Aloka Sinha
In this Letter, a phase-shifting angular shearing interferometer has been proposed for the application in optical surface metrology (SM) by using a combination of a wedge-shaped liquid crystal (LC) cell and a polarization phase shifter. The demonstration of this angular shearing interferometer for step height measurement is accomplished with the help of a phase-shifting technique. Four phase-shifted
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Bound states in the continuum in circular waveguides: toward the on-chip integration of nanofiber on silicon platform Opt. Lett. (IF 3.6) Pub Date : 2024-03-20 Haitao Zhou, Ping Zhong, Sen Jiang, Zhiyuan Gu, and Ying Yu
In previously reported researches on bound state in the continuum (BIC) waveguides, almost all of them are demonstrated with top-down fabrication procedures, leading to inconvenience for post-manipulation and size tuning. Nanofibers with circular cross sections are the fundamental components to transport energy due to their intrinsic advantages of high flexibility and adjustability, which is replaceable
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Multi-harmonic near-infrared–ultraviolet dual-comb spectrometer Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Kristina F. Chang, Daniel M. B. Lesko, Carter Mashburn, Peter Chang, Eugene Tsao, Alexander J. Lind, and Scott A. Diddams
Dual-comb spectroscopy in the ultraviolet (UV) and visible would enable broad bandwidth electronic spectroscopy with unprecedented frequency resolution. However, there are significant challenges in generation, detection, and processing of dual-comb data that have restricted its progress in this spectral region. In this work, we leverage robust 1550 nm few-cycle pulses to generate frequency combs in
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Optimized LNS-FAID of LDPC codes: a hybrid precision decoding approach for 50G-PON Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Yanchen Lyu, Ming Jiang, Mingyang Zhu, Xinyu Zhong, and Chunming Zhao
Efficient error correction in high-speed communication networks, such as the 50G passive optical network (50G-PON), is paramount. This Letter focuses on optimizing a layered non-surjective finite alphabet iterative decoder (LNS-FAID) for 50G-PON, with an emphasis on high-throughput and low-power consumption. We propose using a distinct lookup table (LUT) for each iteration to enhance decoding performance
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Near-perfect absorption of a honeycomb metasurface through QBICs Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Haosen Zhang, Kedi Wu, and Guo Ping Wang
All-dielectric high-Q metasurface absorbers based on quasi-bound states in the continuum (QBICs) are essential for optical and photonic devices. However, achieving perfect absorption requires adding back reflectors at the bottom or placing at least four asymmetric elements in each unit of monolayer metasurfaces, which will increase the design complexity. This work proposes a honeycomb structure with
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Decolorization, spectral broadening, and luminescence enhancement in Tb:Y2O3 transparent ceramics through vacuum thermal reduction Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Cong Zhang, Jianqi Qi, Lexing Liang, Yonggang Yan, and Tiecheng Lu
Tb3+ is extensively employed in magneto-optical devices and luminescent materials owing to its distinctive physical properties. However, under certain conditions, trivalent Tb3+ readily undergoes oxidation to tetravalent Tb4+, significantly reducing the performance of devices containing Tb3+. In this Letter, we report a technique called dual-annealing (DA) post-treatment, which effectively solves Tb
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Vortex retarder-based Stokes polarimeters: optimal data processing and autocalibration capability Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Xiaobo Li and François Goudail
We present a full Stokes polarimeter that utilizes a vortex retarder (VR) in conjunction with a polarization camera. We demonstrate its capability to estimate the full Stokes vector in a single shot with optimal precision and to autocalibrate the VR retardance, ensuring precise measurements even in dynamic environments where retardance is variable.
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Interplay between gain and loss in arrays of nonlinear plasmonic nanoparticles: toward parametric downconversion and amplification Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Syed A. Shah, Michael R. Clark, Joseph Zyss, Maxim Sukharev, and Andrei Piryatinski
With the help of a theoretical model and finite-difference time-domain (FDTD) simulations based on the hydrodynamic–Maxwell model, we examine the effect of difference-frequency generation (DFG) in an array of L-shaped metal nanoparticles (MNPs) characterized by intrinsic plasmonic nonlinearity. The outcomes of the calculations reveal the spectral interplay between gain and loss in the vicinity of the
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Subwavelength resolution using the near field of quantum emitters Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Aziz Kolkıran
We propose a novel, to the best of our knowledge, approach to superresolution optical imaging by combining quantum optics and near-field optics. Our concept involves the utilization of single-photon quantum emitters to generate a standalone evanescent wave. We demonstrate that the quantum interference effects of single-photon emitters, in conjunction with their near-field, result in a higher resolution
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Toward high-energy few-cycle optical vortices with minimized topological charge dispersion Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Federico J. Furch and Gunnar Arisholm
A simple approach to generate high-energy few-cycle optical vortices with minimized topological charge dispersion is introduced. By means of numerical simulations, it is shown that, by leveraging the intrinsic properties of optical parametric chirped pulse amplification (OPCPA), clean transfer of topological charge from a high-energy narrowband pump pulse to a broadband idler is feasible under certain
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Dual-wavelength channel GHz repetition rate mode-locked VECSEL cavities sourced from a common gain medium Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Simon P. Tsaoussis, Sadhvikas Addamane, R. Jason Jones, and Jerome V. Moloney
Mode-locked vertical external cavity semiconductor lasers are a unique class of nonlinear dynamical systems driven far from equilibrium. We present a novel, to the best of our knowledge, experimental result, supported by rigorous microscopic simulations, of two coexisting mode-locked V-cavity configurations sourced by a common gain medium and operating as independent channels at angle controlled separated
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Learning-based correction with Gaussian constraints for ghost imaging through dynamic scattering media: erratum Opt. Lett. (IF 3.6) Pub Date : 2024-03-19 Yang Peng and Wen Chen
We correct a typographical error in our Letter [Opt. Lett. 48, 4480 (2023) [CrossRef] ]. The corrections have no influence on the results and conclusions of the original Letter.
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Delta-sigma modulation supporting the 4194304QAM dual polarization signal at the W-band transmission over a 4.6 km wireless distance Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Jiaxuan Liu, Jianjun Yu, Xianming Zhao, Long Zhang, Xiongwei Yang, Yi Wei, Mingxu Wang, Bohan Sang, and Feng Zhao
In this Letter, we propose a dual-polarized coherent millimeter-wave system based on differential delta-sigma modulation (D-DSM) intended for long-distance wireless transmission in the W-band. The proposed system can transmit polarization-division-multiplexed (PDM) D-DSM signals with modulation orders up to 4194304QAM over a wireless channel for 4.6 km at a signal baud rate of 20 G. After 4.6 km of
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Net-432-Gb/s/λ PS-PAM transmission based on advanced DSP and single DAC for 400 G/λ IM/DD links Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 An Yan, Guoqiang Li, Sizhe Xing, Wangwei Shen, Yongzhu Hu, Aolong Sun, Jianyang Shi, Ziwei Li, Chao Shen, Nan Chi, and Junwen Zhang
The escalating surge in datacenter traffic creates a pressing demand for augmenting the capacity of cost-effective intensity modulation and direct detection (IM/DD) systems. In this Letter, we report the demonstration of the single-lane 128-GBaud probabilistically shaped (PS)-PAM-20 IM/DD transmission using only a single digital-to-analog converter (DAC) for a net 400 G/λ system. Based on the advanced
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Sub-Nyquist sampling-based high-frequency photoacoustic computed tomography Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Songde Liu, Chenxi Zhang, Junyi Zhang, Xingyang Liu, Benpeng Zhu, and Chao Tian
High-frequency (greater than 30 MHz) photoacoustic computed tomography (PACT) provides the opportunity to reveal finer details of biological tissues with high spatial resolution. To record photoacoustic signals above 30 MHz, sampling rates higher than 60 MHz are required according to the Nyquist sampling criterion. However, the highest sampling rates supported by existing PACT systems are typically
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Wavelength-switchable watt-level continuous wave near-infrared Pr3+:LiYF4 lasers pumped by an InGaN laser diode Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Zhuang Li, Wenlu Liao, Zheng Zhang, Huiying Xu, and Zhiping Cai
We report a high-performance wavelength-switchable near-infrared Pr3+:LiYF4 (Pr:YLF) laser by InGaN laser diode (LD) pumping. The 895, 922, and 924 nm lasers with low emission cross sections in the Pr:YLF crystal have been successfully realized using a birefringent filter Lyot as well as designing and optimizing optical thin films and the laser resonant cavity. The maximum output powers of the 895
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208 W single-frequency 1064 nm laser based on a single-crystal fiber master-oscillator power amplifier Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Yixiao Wei, Weina Peng, Jiawei Li, Pixian Jin, Jing Su, and Huadong Lu
High-power all-solid-state continuous-wave (CW) single-frequency laser with high linear polarization is a significant source for quantum optics and precision measurement. In this Letter, a high-power linearly polarized CW single-frequency laser based on the single-crystal fiber (SCF) master-oscillator power amplifier (MOPA) is presented, in which a homemade 140 W low-noise CW single-frequency laser
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Polarization-insensitive high-numerical-aperture metalens for wide-field super-resolution imaging Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 Lieyu Chen, Wenwei Liu, Zhancheng Li, Yuebian Zhang, Hua Cheng, Jianguo Tian, and Shuqi Chen
The development of super-oscillatory lens (SOL) offers opportunities to realize far-field label-free super-resolution microscopy. Most microscopes based on a high numerical aperture (NA) SOL operate in the point-by-point scanning mode, resulting in a slow imaging speed. Here, we propose a high-NA metalens operating in the single-shot wide-field mode to achieve real-time super-resolution imaging. An
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Chirp-driven control over fast–slow light effects in epsilon-near-zero metamaterials Opt. Lett. (IF 3.6) Pub Date : 2024-03-18 V. B. Novikov, A. A. Dotsenko, A. P. Leontiev, K. S. Napolskii, and T. V. Murzina
Optical applications based on fast and slow light effects force the usage of metamaterials famous for their flexible dispersion properties. In this work, we apply the unique optical nonlocality of metal nanorod-based epsilon-near-zero (ENZ) metamaterials along with the chirp of femtosecond laser pulses for astonishing control of these effects. We demonstrate the switching between the fast and slow
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Spatiotemporal dual-periodic soliton pulsation in a multimode fiber laser Opt. Lett. (IF 3.6) Pub Date : 2024-03-12 Wen-Yao He, Guang-Xin Liu, Jia-Wen Wu, Ye-Ting Qin, Zhi-Yin Feng, Guang-Xin Zhang, Wen-Jun Li, Hu Cui, Zhi-Chao Luo, Wen-Cheng Xu, and Ai-Ping Luo
Spatiotemporal mode-locked (STML) fiber lasers have become a new platform for investigating nonlinear phenomena. In this work, spatiotemporal dual-periodic soliton pulsation (SDSP) is firstly observed in an STML fiber laser. It is found that in the SDSP, the long-period pulsations (LPPs) of different transverse modes are synchronous, while the short-period pulsations (SPPs) exhibit asynchronous modulations
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Optimized pilot structure for PS-PDM ultrahigh-order QAM coherent optical transmission Opt. Lett. (IF 3.6) Pub Date : 2024-03-12 Xin Shi, Mingyi Gao, Xuejing Huang, Jiamin Fan, Xinbang Han, Xiaodi You, and Gangxiang Shen
We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same information entropy as the transmitted signal. The pilot symbols are simultaneously used in the entire
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Pre-equalization scheme for visible light communications with trial-and-error learning Opt. Lett. (IF 3.6) Pub Date : 2024-03-15 Shupeng Li, Yi Zou, Fangming Liu, and Jian Song
In this Letter, we propose a novel, to the best of our knowledge, neural network pre-equalizer based on the trial-and-error (TE) mechanism for visible light communication. This approach, unlike indirect learning (IL) architecture, does not require an additional auxiliary post-equalizer. Instead, it allows the pre-equalizer to be trained directly from the transmitter side through continuous interaction
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Coherent multi-band MIMO radar: robustness analysis to SSMF-based RF signal delivery Opt. Lett. (IF 3.6) Pub Date : 2024-03-11 Gaurav Pandey, Mirco Scaffardi, Salvatore Maresca, Malik Muhammad Haris Amir, Antonella Bogoni, and Antonio Malacarne
A numerical evaluation is conducted to assess the impact of distributing radio frequency (RF) signals through optical fiber links on the performance of a coherent multi-band multiple-input multiple-output (MIMO) radar system. The analysis focuses on scenarios where the antennas are widely separated in comparison to the employed signal wavelengths. The development of a model to quantify the phase noise
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High quality holographic 3D display with enhanced focus cues based on multiple directional light reconstruction Opt. Lett. (IF 3.6) Pub Date : 2024-03-11 Zi Wang, Li Liang, Tao Chen, Guoqiang Lv, Qibin Feng, Anting Wang, and Hai Ming
Holographic display faces the trade-off between image quality and focus cues, resulting from the specific choice of phase distribution. In this Letter, we propose a speckle-free holographic display with enhanced focus cues by multiple directional light reconstruction. The uniform phase hologram is first generated by the gradient descent optimization algorithm. The blazed grating phase is used to steer
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Performance evaluation of ground layer adaptive optics based on layer correction efficiency Opt. Lett. (IF 3.6) Pub Date : 2024-03-14 Ziming Li, Ying Yang, Lanqiang Zhang, Linhai Huang, and Changhui Rao
Ground layer adaptive optics (GLAO) has been widely employed in wide-field observations with ground-based telescopes. However, the present evaluation of GLAO performance lacks a criterion in terms of turbulence layer correction. This deficiency results in a significant gap in understanding the effectiveness of GLAO correction at different heights of the turbulence layer, thereby hindering the optimization
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Virtual reality images created on the back and front of a display Opt. Lett. (IF 3.6) Pub Date : 2024-03-15 Yoichi Ogata and Mykyta Kolchiba
To better investigate the biological mechanism of microorganisms, we developed a novel, to the best of our knowledge, virtual reality (VR) microscope that incorporates a head-mounted display (HMD) that creates VR images with a digital microscope. This type of VR microscope can be used with any type of optical microscope. The fabricated microscope is quite different from a common bifocal device because
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Demonstration of a 1 TW peak power, joule-level ultrashort Tm:YLF laser Opt. Lett. (IF 3.6) Pub Date : 2024-03-12 Issa Tamer, Zbynek Hubka, Leily Kiani, Jason Owens, Andrew Church, František Batysta, Thomas Galvin, Drew Willard, Andrew Yandow, Justin Galbraith, David Alessi, Colin Harthcock, Brad Hickman, Candis Jackson, James Nissen, Sean Tardiff, Hoang Nguyen, Emily Sistrunk, Thomas Spinka, and Brendan A. Reagan
We report on the demonstration of a diode-pumped, Tm:YLF-based, chirped pulse amplification laser system operating at λ ≈ 1.9 µm that produces amplified pulse energies exceeding 1.5 J using a single 8-pass power amplifier. The amplified pulses are subsequently compressed to sub-300 fs durations by a diffraction grating pair, producing record >1 TW peak power pulses. To the best of our knowledge, this
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GHz repetition rate, sub-100-fs Ho:CALGO laser at 2.1 µm with watt-level average power Opt. Lett. (IF 3.6) Pub Date : 2024-03-13 Weichao Yao, Mohsen Khalili, Yicheng Wang, Martin Hoffmann, Marcel van Delden, Thomas Musch, and Clara J. Saraceno
We report on a GHz fundamental repetition rate Kerr-lens mode-locked Ho:CALGO laser emitting at 2.1 µm. The laser employs a ring cavity to increase the fundamental repetition rate to 1.179 GHz and can be made to oscillate in both directions stably with nearly identical performance: for the counterclockwise oscillation, it generates 93-fs pulses at 1.68 W of average power, whereas 92 fs and 1.69 W were
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Multiple hyperbolic waves Opt. Lett. (IF 3.6) Pub Date : 2024-03-11 Zixun Ge, Shan Zhu, Wen Xiao, and Huanyang Chen
This study presents a conceptual design for a hyperbolic material utilizing transformation optics. This material is designed to produce multiple hyperbolic wave fields or polaritons excited by a point source. The design dictates key parameters including branch number, propagation range, and overall propagation direction of deflection. Through this approach, the hyperbolic material demonstrates new
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Beam-shaped femtosecond laser printing of quasi-capsule-shaped holographic terahertz metasurfaces Opt. Lett. (IF 3.6) Pub Date : 2024-03-11 Dan Rao, Jing Qian, Xiaohan Yu, Lequn Liu, Guande Wang, Yiwen Zhou, Teng Zhang, and Quanzhong Zhao
Terahertz (THz) metasurfaces have opened up a new avenue for the THz wavefront modulation. However, high-efficient and low-cost fabrication of THz metasurfaces remains a great challenge today. Here, quasi-capsule-shaped polarization-multiplexed holographic THz metasurfaces were printed by a beam-shaped femtosecond laser. The laser beam was spatially modulated by holograms of optimized cylindrical lens
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All-dielectric geometric metasurfaces for the generation and manipulation of perfect high-order Poincaré sphere beams Opt. Lett. (IF 3.6) Pub Date : 2024-03-13 Kaixiang Cheng, Yan Li, Zhendong Zhang, Yi Liu, Yanhua Han, and Xiaosai Wang
A high-order Poincaré sphere (HOPS) can be used to describe high-order modes of waveguides and vector beams, since it generalizes the feature of spin and the orbital angular momentum of light. HOPS beams are such beams with polarization states on the HOPS, which have potential applications in optical manipulation and optical communication. In general, the intensity distribution of this kind of beam
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Polarization-resolved super-resolution second-harmonic generation imaging based on multifocal structured illumination microscopy Opt. Lett. (IF 3.6) Pub Date : 2024-03-11 Yong Zhang, Chenshuang Zhang, Renlong Zhang, Rong Xu, Bin Yu, Danying Lin, and Junle Qu
Polarization-resolved second-harmonic generation (PSHG) microscopy is widely used in investigating the structural and morphological alterations of collagen. However, the resolution of second-harmonic generation (SHG) imaging remains constrained by optical diffraction, resulting in the polarization extraction of collagen characteristics from the average properties of collagen fibers. In this study,