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Specificity of micro- and nanoproducts of titanium laser ablation in pure water Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 T.I. Borodina, G.E. Val’yano, M.M. Malikov
Laser ablation of titanium in distilled water at high and low power densities of copper vapour laser beam in the focal spot on a target surface is experimentally studied. Ablation regimes with different pulsed energy inputs and target irradiation times are investigated. The morphology and elemental and phase compositions of micro- and nanoaggregates obtained in different irradiation regimes are studied
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Compact superluminescent AlGaInAs/InP strain-compensated quantum-well diodes for fibre-optic gyroscopes Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 D.R. Sabitov, V.N. Svetogorov, Yu.L. Ryaboshtan, M.A. Ladugin, A.A. Marmalyuk, M.G. Vasil’ev, A.M. Vasil’ev, Yu.O. Kostin, A.A. Shelyakin
Compact superluminescent diodes based on AlGaInAs/InP separate-confinement double heterostructures with strain-compensated quantum wells are studied. The characteristics of these diodes that allow their application for development of fibre-optic gyroscopes in a temperature range from – 55 °C – +70 °C are demonstrated. The devices demonstrate an acceptable reliability and a potential for further improvement
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Stimulated low-frequency Raman light scattering in systems of nano- and submicron-sized particles Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 M.A. Karpov, A.D. Kudryavtseva, M.A. Shevchenko, N.V. Tcherniega, S.F. Umanskaya
We present a brief review of experimental work on the investigation of stimulated low-frequency Raman scattering of light in systems of submicron and nanosized particles of various physical nature.
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Interaction of blackbody radiation with rubidium and caesium atoms in small-angular-momentum Rydberg states Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 I.L. Glukhov, A.A. Kamenski, V.D. Ovsiannikov
We examine the possibilities of refining an asymptotic description and quantitative calculations of the effects induced by thermal blackbody radiation (BBR) of the environment on the Rydberg states of atoms. Numerical values are calculated and asymptotic expressions are proposed for simplified estimates of natural lifetimes and threshold photoionisation cross sections for Rydberg states of rubidium
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Characteristics of a heterodyne laser interferometer laboratory model for the development of a space gravimetry project Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 K.S. Kudeyarov, V.K. Milyukov, D.S. Kryuchkov, I.A. Semerikov, O.A. Ivlev, K.Yu. Khabarova, N.N. Kolachevsky
We investigate displacement measurements of up to 17 μm on a heterodyne laser interferometer laboratory model. The measurement error for small (up to 200 nm) linear displacements is found to be 270 pm at a 10-s averaging time. The results obtained can be used for developing a space laser interferometric system for the global Earth’s gravity field mapping.
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Magnetic coherence effects in the spectroscopy of transitions between energy levels with total angular momenta J = 1/2 and J = 1 using unidirectional waves Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 E.G. Saprykin, A.A. Chernenko
The physical processes that form the spectra of saturated absorption resonances at atomic transitions between energy levels with angular momenta J = 1/2 and J = 1 in the field of two unidirectional linearly polarised laser waves are studied analytically and numerically. It is shown that the specific features of the resonance spectra are formed in the Λ-schemes of transitions and manifest themselves
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CW optical parametric oscillator for the mid-IR range Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 M.D. Yakovin, P.L. Chapovsky
We report the development of a cw optical parametric oscillator (OPO) for the mid-IR range. The oscillator uses a 50-mm long periodically poled lithium niobate crystal in a ring resonator. The OPO is pumped by an ytterbium fibre laser with a wavelength of 1.064 μm. At a pump power of 10 W, the OPO generates continuous radiation with a wavelength of 3.6 μm and a power of 2.8 W. The pump power depletion
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Application of all-optical magnetometry for detection of weak magnetic fields generated by a current-carrying metallised track Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 E. Taskova, E. Alipieva, N. Stankova, V. Ranev, C. Andreeva, D.V. Brazhnikov
A pump – probe configuration is used to register zero-field level-crossing resonances in Rb vapour contained in a cell with antirelaxation coated walls. The scheme is applied to detect the weak magnetic field generated by a current-carrying micro-wire (metallised track). Such micro-wires can be employed in neural prostheses and hybrid bionic systems as micro-electrode arrays. More specifically, the
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Rubidium frequency standard with pulsed optical pumping and frequency instability of 2.5 × 10−13τ − 1/2 Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 V.N. Baryshev, G.V. Osipenko, A.V. Novoselov, A.G. Sukhoverskaya, A.I. Boyko, M.S. Aleynikov
The work is dedicated to the further development of a compact quantum frequency standard based on a rubidium gas cell with a mixture of buffer gases. The results of frequency measurements and analysis of short-term frequency instability obtained on a laboratory prototype of a microwave rubidium atomic frequency standard (RAFS) with pulsed optical pumping (POP) are presented. The main in magnitude contributions
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Evolution of an ultracold gas in a non-Abelian gauge field: finite temperature effect Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 M. Hasan, Ch.S. Madasu, K.D. Rathod, C.C. Kwong, D. Wilkowski
The cooling mechanisms of a Fermionic strontium-87 gas are refined in order to study its evolution under a non-Abelian gauge field. Significant attention is paid to the effect of the finite temperature of the gas on the process in question. The efficiency of the loading of atoms in a cross-dipole trap is described in detail, the quantitative performance of the evaporative cooling is calculated, and
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Prospects for anisotropic superfluidity in a Fermi gas of dysprosium Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 V.A. Vinogradov, K.A. Karpov, M.V. Platonova, A.V. Turlapov
The possibility of obtaining superfluid phases for a Fermi gas of dysprosium with a magnetic dipole – dipole interaction is discussed. The obstacles and possible solutions are shown. The required phases are similar to the A1 phase and the polar β phase in 3He. It is expected that in dysprosium, the macroscopic properties of the phase will be determined by the symmetry of the pair interactions. It is
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Physical processes during ultracold plasma expansion Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 B.B. Zelener, S.Ya. Bronin, E.V. Vilshanskaya, E.V. Vikhrov, K.P. Galstyan, N.V. Morozov, S.A. Saakyan, V.A. Sautenkov, B.V. Zelener
Using the method of molecular dynamics, the expansion of a two-component, pulsed laser-produced ultracold plasma is directly calculated for various values of the number and density of particles and their electron temperatures. A new method is presented for generating and diagnosing a steady-state ultracold plasma formed under continuous wave laser irradiation. The performed calculations show the difference
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Dynamics of three-photon laser excitation of mesoscopic ensembles of cold rubidium atoms to Rydberg states Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 D.B. Tretyakov, V.M. Entin, E.A. Yakshina, I.I. Beterov, I.I. Ryabtsev
The temporal dynamics of three-photon 5S1/2 → 5P3/2 → 6S1/2 → 39P3/2 laser excitation of mesoscopic ensembles of cold Rb atoms to Rydberg states in a magneto-optical trap is studied using cw single-frequency lasers at each stage. The ensembles comprise N = 1 – 5 atoms and are detected by the method of selective field ionisation with postselection with respect to the number of atoms. The dependence
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Effect of optical lattice field on characteristics of a clock transition in thulium atoms Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 D.A. Mishin, D.I. Provorchenko, D.O. Tregubov, A.A. Golovizin, K.Yu. Khabarova, V.N. Sorokin, N.N. Kolachevsky
This paper presents a detailed analysis of the effect of the optical lattice field on clock transition spectroscopy, as exemplified by thulium atoms. We consider the applicability of the sifting of atoms in an optical lattice by ramping down the power of the laser light that produces it. This method allows the number of filled vibrational sublevels to be reduced down to a single vibrational state,
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Towards an optical time scale at VNIIFTRI Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 D.V. Sutyrin, A.Yu. Gribov, R.I. Balaev, A.A. Gorokhina, V.G. Pal’chikov, A.N. Malimon, S.N. Slyusarev
A frequency chain for converting the frequency of an optical clock based on ultracold 87Sr atoms is updated for its comparison with the frequency of microwave standards from the State Primary Standard of time and frequency units and the national time scale, GET 1-2018. The results of the corresponding experiments are reported and analysed. An instrumental complex for reproducing and keeping the time
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Conference on Physics of Ultracold Atoms in Russia – a new step towards deepening international cooperation Quantum Electron. (IF 0.9) Pub Date : 2022-06-01 N N Kolachevsky, I I Ryabtsev, A V Taichenachev
At the end of December 2021, there was held online the annual, fifteenth in a row, All-Russian Conference on Physics of Ultracold Atoms, in which scientists from other countries took part. Over the past years, this conference has changed dramatically: from a one-day workshop of participants in the integration projects of the Siberian Branch of the Russian Academy of Sciences, where the results of the
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The concept of a stigmatic flat-field X-ray spectrograph based on conical diffraction Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.O. Kolesnikov, E.N. Ragozin, A.N. Shatokhin
The optical scheme of a flat-field stigmatic X-ray spectrograph, which includes a grazing-incidence focusing mirror and a concave fan-type diffraction grating crossed with respect to the mirror and mounted in a conical diffraction scheme, is calculated analytically. Spectral images of a point monochromatic source are obtained by numerical ray tracing, confirming the high quality of spectral images
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Interaction of an array of single-electron quantum dots with a microcavity field with allowance for Coulomb correlations Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.V. Tsukanov, I.Yu. Kateev
We consider an ordered array of semiconductor single-electron quantum dots located in the antinode of a mode of a microcavity based on a two-dimensional photonic crystal. The influence of Coulomb effects on the energy exchange between quantum dots and the mode is studied in arrays for different numbers of dots. The stability of resonant electron – photon dynamics is analysed as a function of technological
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Assessment of the thermal effect of femtosecond and millisecond laser pulses in microsurgery of mammalian embryos Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 D.S. Sitnikov, I.V. Ilina, A.A. Pronkin
We compare the thermal effect exerted by femtosecond and millisecond pulses during microsurgical procedures on embryos. The linear and nonlinear absorption of laser pulses in an aqueous medium, as well as heat transfer from the focusing region of the laser beam to adjacent regions, are considered.
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Spectroscopic VUV diagnostics of high-temperature iron plasmas using the comparison method Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.P. Shevelko
We report the development of a new comparison method used to estimate the electron temperature T e of heavy-element plasmas and high-temperature iron laser-produced plasmas. To this end, two laser-produced plasmas – magnesium plasmas and iron plasmas – were studied at identical laser radiation fluxes on the target. Plasma diagnostics was performed using X-ray spectra of H- and He-like Mg ions. VUV
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Superluminescence in the phonon wing of the photoluminescence spectrum of NV centres in diamond optically pumped at λ = 532 nm Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 E.I. Lipatov, D.E. Genin, M.A. Shulepov, E.N. Tel’minov, A.D. Savvin, A.P. Eliseev, V.G. Vins
Superluminescence of NV centres with a band peaking at λ = 718 nm in the phonon wing of the photoluminescence spectrum of a high-pressure high-temperature (HPHT) diamond sample under pulsed optical excitation at λ = 532 nm with an intensity of 2 – 46 MW cm−2 is demonstrated. Superluminescence is observed in the diamond crystal region containing 6 ppm NV centres and 150 ppm substituent nitrogen; it
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Generation and dynamics of wave packets with a large phase modulation depth Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.S. Abramov, I.O. Zolotovskii, D.A. Korobko, V.A. Kamynin, V.A. Ribenek, A.A. Fotiadi, V.S. Tsarev
This paper examines the generation of high-frequency picosecond pulse trains as a result of modulation instability of wave packets with a large phase modulation depth and small amplitude modulation depth. We demonstrate that intermediate amplification of such wave packets and subsequent phase-to-amplitude modulation conversion lead to the formation of pulses with peak powers orders of magnitude higher
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Attenuation of the intensities of spectral components of a multiwavelength pulsed laser system by means of the Bragg diffraction of radiation by several acoustic waves Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.S. Machikhin, M.O. Sharikova, A.I. Lyashenko, A.B. Kozlov, V.E. Pozhar, V.A. Lomonov, E. Stoikova
A method for controlling precisely the intensities of several spectral components of radiation generated by a multiwavelength laser system is described. The method is based on the use of simultaneous Bragg diffraction by a set of acoustic waves of corresponding frequencies and adjustment of their amplitudes. The efficiency of the proposed method is demonstrated by the example of a multiwavelength system
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Two-level gas laser with transverse diode pumping Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 A.I. Parkhomenko, A.M. Shalagin
We theoretically study a new method for generating laser radiation by a two-level system without population inversion in the ‘red’ wing of its spectral line under resonant absorption of broadband radiation from pump laser diodes. A two-level system simulates the atoms of an active gas in an atmosphere of a high-pressure buffer gas. The effect results from the fact that in the ‘red’ wing of the spectral
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Thermoelastic stresses in high-power CW diode laser arrays assembled on CuW and AlN submounts Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 V.P. Gordeev, V.A. Oleshchenko, V.V. Bezotosnyi
Comparative results are presented of 3D-calculation for thermoelastic stress (TES) profiles in diode laser arrays (LDAs) assembled on CuW and AlN submounts (temperature compensators) and operating at a continuous-wave (CW) thermal power load of up to 220 W. For the first time, the simulation has revealed substantial differences in the maximal TES values for the arrays assembled on CuW and AlN submounts
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Amplification of laser radiation at the edge of the KrF (B–X) spectral line Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 S.A. Yampolskaya, A.G. Yastremskii, Yu.N. Panchenko, A.V. Puchikin
We report the results of experimental and numerical studies of the KrF electric discharge amplifier operating on a mixture of He – Kr – F2 gases. The possibility of expanding the short-wavelength spectral region of the induced radiation tuning at the B – X transition of the KrF molecule by removing the inverse population from the upper vibrational states of the electronic B level is shown. It is demonstrated
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Specific features of radiation flux formation in diode-pumped lasers and amplifiers with active elements made of Nd : YAG ceramics Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 M.V. Bogdanovich, V.N. Dudikov, K.V. Lepchenkov, V.A. Loiko, Yu.M. Popov, A.G. Ryabtsev, G.I. Ryabtsev, P.V. Shpak, M.A. Shchemelev
The spatial, temporal, and spectral characteristics of the output radiation of diode-pumped laser systems and optical amplifiers with active elements made of Nd : YAG ceramics are studied. It is shown that the divergence of radiation in the subthreshold regime has the form of concentric nested cones emerging from the active element (AE) faces at angles of 2 – 4 °. A model explaining the experimentally
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Optical second harmonic generation: role of symmetry and local resonances (review) Quantum Electron. (IF 0.9) Pub Date : 2022-05-01 I.M. Baranova, T.V. Dolgova, I.A. Kolmychek, A.I. Maydykovskiy, E.D. Mishina, T.V. Murzina, A.A. Fedyanin
We report some results of studying optical second-harmonic generation (SHG) on surfaces and at interfaces of centrosymmetric media, in resonant nano- and microstructures, and in ferroelectric materials. The research was carried out at the Department of Quantum Electronics of the Lomonosov Moscow State University under the supervision of Professor O.A. Aktsipetrov, and subsequently developed by his
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Application of PT-symmetry properties to increase the limiting sensitivity of resonator optical gyroscopes Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 E.V. Shalymov, T.M. Akhmadiev, V.B. Davydov
We propose and describe the use of a system with PT-symmetry properties in resonator optical gyroscopes. It is shown that this makes it possible to increase the limiting sensitivity and does not introduce disadvantages typical of PT-symmetric laser gyroscopes. In the example considered in the paper, the inclusion of a system with PT-symmetry properties in the composition of a resonator optical gyroscope
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Comparison of field shifts in an atomic clock based on the effect of coherent population trapping in 87Rb atoms under modulation of laser pump current at frequencies of 3.4 and 6.8 GHz Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 S.M. Ignatovich, M.N. Skvortsov, I.S. Mesenzova, L.N. Kvashnin, V.I. Vishnyakov, D.V. Brazhnikov, S.N. Bagayev
Experimental parameters of the resonance of coherent population trapping (CTP) on D1 line in 87Rb and light shifts are compared under modulation of the laser pump current at frequencies of 3.4 and 6.8 GHz. Reproducibility of the parameters of a laser with a vertical cavity needed for long-term stability of an atomic clock is considered. The instabilities of atomic CPT-clock obtained for 1 s are 1.2
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A model for the formation of complex coupling coefficients in a ring resonator of a laser gyroscope Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 E.A. Petrukhin, A.S. Bessonov
A model of the interference of fields from backscattering point sources in a ring optical resonator is presented. Examples of calculations of complex coupling coefficients in ring resonators of laser gyroscopes are given. Comparison of the calculation results with the results of model experiments demonstrates good agreement and makes it possible to determine dissipative and conservative backscattering
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Efficient two-stage laser enrichment up to 99% of carbon-13 isotope by IR multiphoton dissociation of Freon molecules Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 V.B. Laptev, S.V. Pigul’skii
A new method for two-stage laser enrichment of carbon-13 (13C) by isotope-selective IR multiphoton dissociation of Freon molecules is considered, which makes it possible to achieve a concentration of 13C up to 99 % or higher with high productivity. At the first stage, as a result of the selective dissociation of CF2HCl (Freon-22) molecules, it is expected to obtain a C2F4 dissociation product enriched
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Broadband emission from polycrystalline graphite Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 S.Sh. Rekhviashvili, D.S. Gaev, Z.Ch. Margushev
Visible radiation spectra of polycrystalline graphite under electrical and laser excitation is studied. It is shown that two different mechanisms of photon emission with a broadband spectrum are implemented in this material. The radiation arising as a result of resistive heating is thermal radiation, whose parameters are close to those of blackbody radiation. The laser-induced secondary radiation in
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Absorption spectra and mechanical properties of C : F nanocoatings deposited from laser plasma onto leucosapphire surface Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 P.B. Sergeev, K.S. Kravchuk, N.V. Morozov
It is experimentally shown that during laser annealing of micron layers of fluorocarbon oil by high-power KrF laser radiation pulses, C : F nanocoatings with a thickness of up to ∼100 nm can be synthesised on a leucosapphire surface. The absorption spectra of these coatings, measured in the 0.19 – 6 μm range, virtually coincided with the absorption spectra of fluorographene in the quantum energy range
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Analysis of light – current characteristics of high-power semiconductor lasers (1060 nm) in a steady-state 2D model Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 S.O. Slipchenko, V.S. Golovin, O.S. Soboleva, I.A. Lamkin, N.A. Pikhtin
This paper presents a 2D model of a high-power semiconductor laser, which takes into account carrier transport across the layers of its heterostructure and longitudinal spatial hole burning (LSHB), an effect related to the nonuniform gain distribution along the cavity axis. We show that the use of the 2D model which takes into account carrier transport across the layers of the heterostructure allows
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IR laser oscillation on caesium and rubidium atomic transitions upon pumping to high-lying energy levels Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 A.A. Babin, M.V. Volkov, S.G. Garanin, S.A. Kovaldov, A.V. Kopalkin, F.A. Starikov, A.V. Strakhov, V.V. Feoktistov
Laser oscillation is obtained in caesium and rubidium atoms with wavelengths in the range of 2 – 5.5 μm under pumping to high-lying energy levels. Longitudinal resonant pumping is implemented using the second harmonic of radiation from an optical parametric oscillator. The pump wavelength is tuned over discrete levels from 8P to 10P in caesium atoms and from 6P to 8P in rubidium atoms. The width of
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The Autler – Townes effect, the Rabi frequency, and determination of characteristics of the decay of excited states in the photoionisation scheme of lutetium Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 A.B. D’yachkov, A.A. Gorkunov, A.V. Labozin, S.M. Mironov, V.A. Firsov, G.O. Tsvetkov, V.Ya. Panchenko
The splitting of the first and second transitions in the lutetium photoionisation scheme is studied in a wide range of laser radiation intensities, and the Rabi frequencies as functions of the radiation intensity are determined. Based on the results, we have obtained the decay branching coefficients of 0.54 and 0.41 for the first and second transitions, respectively.
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Semiconductor disk laser with a wavelength of 780 nm based on a MOCVD-grown Al x Ga1–x As/Al y Ga1–y As heterostructure with optical and electron beam pumping Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 M.R. Butaev, Ya.K. Skasyrsky, V.I. Kozlovsky, A.Yu. Andreev, I.V. Yarotskaya, A.A. Marmalyuk
A pulsed semiconductor disk laser based on the Al x Ga1 – x As/Al y Ga1 – y As structure with resonantly periodic gain and a built-in Bragg mirror emitting at a wavelength near 780 nm is studied. The laser characteristics are presented both for pumping by an electron beam and for optical pumping by laser diode radiation with a wavelength of 450 nm. Under pumping by an electron beam, a peak power of
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Semiconductor laser based on a CdS/ZnSe heterostructure with longitudinal optical pumping by a laser diode Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 M.R. Butaev, V.I. Kozlovsky, Ya.K. Skasyrsky
An optically pumped semiconductor laser based on a CdS/ZnSe heterostructure containing 10 coupled quantum wells is studied. The structure is grown by metalorganic vapour phase epitaxy on a GaAs substrate. A microcavity with interference dielectric mirrors is fabricated based on this structure. At room temperature under longitudinal pumping by an InGaN/GaN pulsed laser diode with a wavelength of 438
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Multipass Yb : KGW disk amplifier Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 A.K. Potemkin, M.A. Martyanov, S.Yu. Mironov
We have investigated a multipass Yb : KGW disk amplifier based on the White cell configuration and pumped by a laser diode with a fibre output. It is shown that the three-mirror layout of the cell is three times more efficient than the four-mirror one, since the size and position of the signal beam on the surface of the active element do not depend on the cell number of passes. For a three-mirror cell
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High-power quasi-cw semiconductor lasers (1060 nm) with an ultra-wide emitting aperture Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 S.O. Slipchenko, D.N. Romanovich, V.A. Kapitonov, K.V. Bakhvalov, N.A. Pikhtin, P.S. Kop’ev
High-power quasi-cw semiconductor lasers with an emitting aperture 800 μm wide and a continuous p-contact are developed. Laser operation with a pulse duration of 1 ms, a repetition rate of 10 Hz, and a maximum peak power of 87 W at a wavelength 1060 – 1070 nm is demonstrated under pumping by current pulses with am amplitude of 97 A. Experimental estimates show that overheating of the active region
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Formation of the spatial structure of pump radiation in the focal plane of a lens for different types of stimulated light scattering Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 A.A. Gordeev, V.F. Efimkov, I.G. Zubarev
Experiments of our earlier work on the study of stimulated thermal scattering of the second harmonic of neodymium laser radiation in toluene are reproduced in order to confirm the put forward hypothesis about the nature of the laser beam structure decay in the focal plane of a short-focus lens. Experiments were carried out under similar conditions, but with a liquid (CCl4), in which there is no two-photon
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Femtosecond multiple filamentation of an optical vortex in the mid-IR wavelength range in fused silica and fluorides Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 S.A. Shlenov, V.O. Kompanets, A.A. Dergachev, V.P. Kandidov, S.V. Chekalin, F.I. Soifer
The results of experimental and theoretical study of the self-action of femtosecond optical vortices in the region of anomalous group velocity dispersion in fused silica and fluorides are presented. Multiple filamentation of an axially asymmetric annular beam with a phase dislocation of topological charge m = 1 at a wavelength of 1800 nm in a LiF crystal is investigated. It is found that for the experimentally
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Nonlinear phenomena in femtosecond laser systems based on Yb: YAG thin-rod amplifiers Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 J.W. Kim, S. Park, E.G. Sall, G.-H. Kim, V.E. Yashin, J. Yang
Nonlinear effects in a high-power laser amplification system based on thin-rod active elements are experimentally investigated. It is shown that the most important nonlinear effect is the Kerr effect leading to self-focusing and self-phase modulation of laser radiation. The observed luminescence in Yb : YAG crystals in the visible region of the spectrum is caused by the charge transfer luminescence
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Ultra-broadband mid-infrared frequency combs produced by optical subharmonic generation Quantum Electron. (IF 0.9) Pub Date : 2022-04-01 K.L. Vodopyanov
Optical frequency combs have revolutionised accurate frequency and time measurements and have enabled broadband and simultaneously high resolution spectroscopic measurements that were not previously possible. This paper is an overview of the main results of the previously performed work, describing a new approach to extending frequency combs to the mid-infrared ‘molecular signature’ range using a subharmonic
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Sixty years of nonlinear optics Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 S.G. Grechin,A.B. Savel’ev
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Measurements of small optical absorption and scattering coefficients of high-power polarised laser radiation in lithium triborate crystals Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 I.V. Grishchenko, A.K. Vorob’ev, A.Yu. Ostapiv, Yu.S. Stirmanov, A.V. Konyashkin, O.A. Ryabushkin
We present the results of measurements of low optical absorption and scattering coefficients in lithium triborate crystals using the method of piezoelectric resonance laser calorimetry under the action of polarised single-mode laser radiation at wavelengths of 1070 and 532 nm in the power ranges of 50 – 300 and 5 – 50 W, respectively. It is shown that when radiation propagates along the crystal axis
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1.56-to-2.84 μm SRS conversion of chirped pulses of a high-power erbium fibre laser in a methane-filled hollow-core revolver fibre Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 A.A. Krylov, A.V. Gladyshev, A.K. Senatorov, A.N. Kolyadin, A.F. Kosolapov, M.M. Khudyakov, M.E. Likhachev, I.A. Bufetov
Single-cascade 1.56-to-2.84 μm SRS conversion is demonstrated in a hollow-core revolver fibre filled with methane at a pressure of 25 atm under pumping by positively chirped pulses of a high-power erbium-doped all-fibre laser. At a maximum pump pulse energy of 34 μJ (average power 3.74 W) and a pump pulse duration of about 260 ps, ultrashort pulses (USPs) with a duration of 110 ps and an energy of
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Phase combining of radiation from a two-channel explosively pumped photodissociation iodine laser with an SBS mirror Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 S.G. Garanin, Yu.V. Dolgopolov, G.N. Kachalin, A.V. Kopalkin, S.M. Kulikov, S.N. Pevnyi, F.A. Starikov, S.A. Sukharev
A two-channel double-pass iodine explosively pumped photodissociation laser (EPPL) with an explosively pumped master oscillator (MO) and an SBS mirror is studied. The radiation source, determined by an aperture 6 mm in diameter, through which the radiation from MO enters the turbulent surface air path, is located at a distance of 2.5 km from the amplifier unit input. An SBS mirror with a kinoform raster
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Optical and generation characteristics of new nonlinear Ba2Ga8GeS16 and Ba2Ga8(GeSe2)S14 crystals for the mid-IR range Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 V.V. Badikov, D.V. Badikov, G.S. Shevyrdyaeva, V.B. Laptev, A.A. Melnikov, S.V. Chekalin
Ba2Ga8GeS16 and Ba2Ga8(GeSe2)S14 single crystals of large size and good optical quality have been grown for the first time. Their linear optical characteristics – transmission spectra in the range of 0.3 – 25 μm, dispersion of principal refractive indices, and birefringence – have been measured. Irradiation of the crystals by 100-fs laser pulses with a wavelength of 8.3 μm initiated second-harmonic
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Efficient SRS of chirped Ti : sapphire laser pulses in BaWO4 crystals Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 I.O. Kinyaevskiy, V.I. Kovalev, A.V. Koribut, Ya.V. Grudtsyn, L.V. Seleznev, E.E. Dunaeva, A.A. Ionin
We report an experimental study of SRS of chirped 40-ps Ti : sapphire laser pulses with a transform-limited duration of 0.35 ps and centre wavelength of 925 nm in BaWO4 crystals. The highest generation efficiency for the ∼925 cm−1 shifted Stokes signal of SRS by the ν 1 vibrational mode of BaWO4 crystals has been reached using three sequentially located crystals with a total length of 3.3 cm. The position
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Backward SRS suppression of picosecond pulses in water upon moving the pump beam waist from the water volume through the surface Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 S.M. Pershin, A.I. Vodchits, I.A. Khodasevich, V.A. Orlovich, A.D. Kudryavtseva, N.V. Tcherniega
We report, for the first time to our knowledge, suppression of backward stimulated Raman scattering (BSRS) of picosecond pulses (57 ps, 532 nm) due to the development of optical breakdown in the surface (0 – 3 mm) water layer with a shift of the beam waist (lens focal length of 83 mm) to the water – air interface without changing the pump pulse energy (∼1.3 – 1.5 mJ). In this case, SRS generation in
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Light bullets in transparent dielectrics Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 V.P. Kandidov, E.D. Zaloznaya, A.E. Dormidonov, V.O. Kompanets, S.V. Chekalin
This paper presents a retrospective analysis of the development of notions in nonlinear optics: from beam self-focusing and pulse filamentation to light bullets – wave packets extremely compressed in space and time during laser light propagation in the bulk of a transparent medium. We describe the state of the art in studies of mid-IR light bullets in condensed media and air.
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Mid-IR optical parametric oscillation and second harmonic generation of repetitively pulsed output of a fibre-laser pumped Tm3+ :YAP laser in a fan-out periodically poled MgO:LiNbO3 crystal Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 O.L. Antipov, D.B. Kolker, A.A. Dobrynin, Yu.A. Getmanovskii, V.V. Sharkov, M.A. Chuvakova, A.R. Akhmatkhanov, V.Ya. Shur, I.A. Shestakova, S.V. Larin
The nonlinear optical frequency conversions of repetitively pulsed output of a 1941-nm Tm3+ : YAP laser pumped by a cw 1670-nm fibre laser are studied experimentally. Both mid-IR optical parametric oscillation (OPO) and second harmonic generation (SHG) are obtained in the same periodically poled MgO : LiNbO3 crystal with a fan-out domain design by tuning the grating period and temperature. The energy
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Study of second optical harmonic generation in terahertz pulse-induced antiferromagnetic NiO Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 O.V. Chefonov, A.V. Ovchinnikov, M.B. Agranat
Intense terahertz pulses and a process of second harmonic generation are promising methods for exciting and studying an ultrafast dynamic response in magnetically ordered systems, ferroelectrics, and multiferroics on the picosecond time scale. In the present work, we report experimental results on generation of second optical harmonic in centrosymmetric antiferromagnetic NiO induced by intense terahertz
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Transformation of polarisation singularities in nonlinear mixing of light beams with frequency conversion in a medium with cubic nonlinearity Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 K.S. Grigoriev, V.A. Makarov
We analyse the electric field transverse distributions in light beams with a tripled frequency and with a frequency of 2ω 1 – ω 2, which arise in the bulk of an isotropic cubic-nonlinear medium upon the propagation of nonuniformly polarised beams of fundamental radiation with a multimode transverse structure described by a superposition of Laguerre – Gaussian modes. A relation is found between the
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Nonlinear frequency conversion of a Ho :YAG laser beam Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 K.V. Vorontsov, S.G. Garanin, N.A. Egorov, N.G. Zakharov, R.A. Zorin, V.B. Kolomeets, V.I. Lazarenko, A.S. Nadezhin, G.N. Nomakonov, K.A. Tulyakov, Yu.N. Frolov
We report the results of experiments on frequency conversion of a Ho : YAG laser beam (wavelength λ ∼ 2.1 μm) into the near-, mid-, and far-IR regions, aimed at expanding the spectral composition of compact multispectral sources of coherent radiation. The experimentally found laser conversion efficiency into the second harmonic reaches 32 % and 54 % in the cw and repetitively pulsed regimes, respectively
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Broadband two-dimensional spectrochronography with ultrashort pulses in the mid-infrared Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 E.A. Stepanov, A.N. Zhdanov, I.V. Savitskii, P.B. Glek, A.A. Lanin, A.B. Fedotov, A.M. Zheltikov
A novel, 2.6-to-10-μm wavelength-tunable laser source of sub-70-fs pulses is combined with mid-IR heterodyne detection to provide a versatile laser platform for broadband two-dimensional Fourier-transform infrared spectrochronography. The mid-infrared laser output serves as both a short-pulse driver and a broadband probe for time-resolved studies of ultrafast molecular coherence, population dynamics
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Post-compression of femtosecond laser pulses using self-phase modulation: from kilowatts to petawatts in 40 years Quantum Electron. (IF 0.9) Pub Date : 2022-03-01 E.A. Khazanov
The pulse duration at the output of femtosecond lasers is usually close to the Fourier limit, and can be shortened by increasing the spectral width. To this end, use is made of self-phase modulation when a pulse propagates in a medium with cubic nonlinearity. Then, the pulse with a chirp (frequency dependence of the spectrum phase) is compressed due to a linear dispersion element, which introduces
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Output characteristic of four-frequency Zeeman laser gyroscope with an alternating frequency bias Quantum Electron. (IF 0.9) Pub Date : 2022-02-01 Yu.Yu. Kolbas, Ya.S. Pyatnitskii, M.I. Rodionov, I.I. Saveliev
We have experimentally studied the output characteristic of a four-frequency Zeeman laser gyroscope (ZLG) on longitudinal modes with orthogonal circular polarisations having an alternating frequency bias and compared it with the output characteristic of a two-frequency ZLG. It is shown that by representing a four-frequency ZLG as a set of two-frequency ZLGs with orthogonal polarisations, the output