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Dive into the research topics where G. V. Lanskii is active.

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Featured researches published by G. V. Lanskii.


Optics Express | 2008

SHG phase matching in GaSe and mixed GaSe 1-x S x , x≤0.412, crystals at room temperature

Hong-Zhi Zhang; Zhi-Hui Kang; Yun Jiang; Jin-Yue Gao; Feng-Guang Wu; Zhi-Shu Feng; Yury M. Andreev; G. V. Lanskii; Alexander N. Morozov; Elena I. Sachkova; Sergei Yu. Sarkisov

The optical properties of p-type GaSe and mixed GaSe(1-x)S(x), x=0.04, 0.023, 0.090, 0.133, 0.175, 0.216, 0.256, 0.362, 0.369, and 0.412, crystals were studied to reveal the potentials for phase matching and frequency conversion. Comparative experiment on Er3+:YSGG and CO2 laser SHG at identical experimental conditions is carried out at room temperature. Any change in polytype structure of GaSe1(1-x)S(x) was not found.


Optics Letters | 2012

Cascaded carbon monoxide laser frequency conversion into the 4.3–4.9 μm range in a single ZnGeP 2 crystal

A. A. Ionin; I. O. Kinyaevskiy; Yu. M. Klimachev; A. A. Kotkov; A. Yu. Kozlov; Yu. Andreev; G. V. Lanskii; Anna V. Shaiduko; A. V. Soluyanov

Collinear cascaded mid-IR frequency conversion in a single nonlinear optical crystal was accomplished. Concurrent collinear generation of the sum frequency of multiline fundamental band carbon monoxide laser radiation as a first frequency conversion cascade resulted in collinear difference frequency generation within the 4.3 to 4.9 μm spectral range when mixing this sum frequency radiation with the fundamental one as the second cascade in the same ZnGeP(2) nonlinear optical crystal.


Laser Physics Letters | 2014

Limiting pump intensity for sulfur-doped gallium selenide crystals

Jingwei Guo; Dianjun Li; Jijiang Xie; Laiming Zhang; Zhi-Shu Feng; Yury M. Andreev; K. A. Kokh; G. V. Lanskii; A. I. Potekaev; Anna V. Shaiduko; V. A. Svetlichnyi

High optical quality undoped and sulfur-doped gallium selenide crystals were grown from melts by the modified vertical Bridgman method. Detailed study of the damage produced under femtosecond pulse exposure has shown that evaluation of the damage threshold by visual control is unfounded. Black matter spots produced on crystal surfaces do not noticeably decrease either its transparency or its frequency conversion efficiency as opposed to real damage identified as caked well-cohesive gallium structures. For the first time it was demonstrated that optimally sulfur-doped gallium selenide crystal possesses the highest resistivity to optical emission (about four times higher in comparison with undoped gallium selenide).


AIP Advances | 2014

Impact of fs and ns pulses on indium and sulfur doped gallium selenide crystals

Z.-S. Feng; Z.-H. Kang; X.-M. Li; Zeng-Bin Wang; J.-Y. Gao; Yu. M. Andreev; Victor V. Atuchin; K. A. Kokh; G. V. Lanskii; A. I. Potekaev; A. V. Shaiduko; V. A. Svetlichnyi

The impact of fs and ns pulses on indium and sulfur doped gallium selenide crystals with four and five different doping concentrations, respectively, has been studied in comparison with that of undoped GaSe. The inconsistence of the visual criterion of the damage threshold determination has been demonstrated. The multiphoton absorption and thermal effect have been identified as key factors limiting fs and ns pulse pump intensities, respectively. High advantages in the limit pump intensity as up to 50% for optimally indium-doped crystal and up to 4.5 times for optimally sulfur-doped crystal have been demonstrated under fs pulses expose.


Applied Optics | 2013

Terahertz time-domain spectroscopy for textile identification

Mira Naftaly; J. F. Molloy; G. V. Lanskii; K. A. Kokh; Yu. M. Andreev

A range of natural and artificial textiles are examined using terahertz time-domain spectroscopy. Different types of textiles are shown to have different terahertz optical properties, which may be employed for textile identification and to combat textile counterfeiting.


Journal of The Optical Society of America B-optical Physics | 2007

Influence of composition ratio variation on optical frequency conversion in mixed crystals. I. Gradual variation of composition ratio

Jin Jer Huang; Guang Jü Ji; Tao Shen; Yu. M. Andreev; A. V. Shaiduko; G. V. Lanskii; U. Chatterjee

A theoretical model is presented to deal with optical frequency conversion in a mixed nonlinear crystal with a small linear variation in composition ratio. Using the quasi-geometrical optics method, what we believe to be new diffraction-free coupling equations are developed to describe sum and difference frequency generations. With these new frequencies, we find that an optimal crystal length exists like that in the plane-wave model. Furthermore, the optimization of generated powers with absorption, transverse index modulation, and walk-off effect are studied in detail. According to different efficiency reductions, the tolerance and acceptance of composition ratios along and vertical to the beam propagating direction are presented. Intended gradual index crystals are also discussed for their possible applications in the frequency conversion of wideband lasers and in generating pulse compressed second harmonic ultrashort pulses.


Optics Letters | 2016

Broadband two-stage frequency conversion of CO laser in AgGaSe(2) crystal.

O. V. Budilova; A. A. Ionin; I. O. Kinyaevskiy; Yu. M. Klimachev; A. A. Kotkov; A. Yu. Kozlov; G. V. Lanskii

For the first time, to the best of our knowledge, a broadband two-stage frequency conversion of multiline CO laser radiation was theoretically and experimentally demonstrated in a single AgGaSe2 crystal. The first stage is sum frequency generation of CO laser radiation. The second stage is concurrent difference frequency generation within 4.3-4.9 μm spectral range when mixing sum frequency radiation with the pump radiation in the same AgGaSe2 crystal. Internal sum frequency generation efficiency of multiline CO laser was up to 1%, while internal difference frequency generation efficiency was up to 0.065%.


2nd International Symposium on Laser Interaction with Matter (LIMIS 2012) | 2013

Interaction of high intensity optical pulses with modified nonlinear GaSe crystals

Jin Guo; Jijiang Xie; Laiming Zhang; Ke Jiang; Fei Chen; Yu. Andreev; Victor V. Atuchin; K. A. Kokh; G. V. Lanskii; V. F. Losev; A. V. Shaiduko

The modified Bridgman method with heat field rotation was used to grow ε-polytype single crystals of pure and 1, 2 and 10 mass % S-doped GaSe or solid solution crystals GaSe1-xSx, x = 0.002, 0.091, 0.412. The interaction of ultrashort laser pulses of ∼ 100 fs duration at 800 nm and 2 μm with the grown crystals was studied at room temperature. Up to 3.4-fold advantage of S-doped crystals in limit pump intensity (no decrease in the transmission) was found under 800 nm pump at S-content increase up to 10 mass %. The advantage became a half less at 2 μm pump due to a decrease of two-photon absorption in pure GaSe crystals. The spectral dependence of transient absorption is recorded with 37 fs resolution and interpreted. It was ascertained that first observable damage of high quality crystals is caused by dissociation of submicrometer thick surface layer to initial elements and do not influence the frequency conversion efficiency until alloying of dissociated Ga. Local microdefects, multiphoton absorption and transient transmission processes are identified as key factors responsible for damage threshold.


Laser Physics Letters | 2014

Simulation of thermo-optic coupling in the thermally anisotropic gallium selenide crystal for second harmonic generation

Zhang Wen Chao; Ye Hong An; Yu. Andreev; Sergei G. Grechin; G. V. Lanskii

A second harmonic generation model of space-time thermo-optic coupling was proposed in thermal anisotropic nonlinear crystals, where an iterative approach was used to approximate the temperature anisotropy. The coupling process was simulated with the aid of derived analytical formulas in a gallium selenide crystal, pumped by a pulsed carbon dioxide laser. The intensities of the fundamental and harmonic beams, conversion efficiencies and temperature distributions were demonstrated during the evolution processes. The results showed that a compensation for the phase mismatch induced by the thermal effect can mitigate the reduction of conversion efficiency better than temperature control.


Proceedings of SPIE | 2013

Optimal doping of GaSe with isovalent elements

Victor V. Atuchin; Yury M. Andreev; K. A. Kokh; G. V. Lanskii; Anna V. Shaiduko; T.I. Izaak; V. A. Svetlichnyi

The сentimeter-sized GaSe crystals doped with 0.01, 0.05, 0.1, 0.2, 0.5, 1, 2 at.% of Al and 0.025, 0.1, 0.5, 1,2 at. % of Er have been grown by the modified Bridgman method with heat field rotation. The crystals have been studied in comparison with GaSe crystals doped with 0.1, 0.5, 1, 2, 3, 5, 7, 10.2 wt.% of S, 0.01, 0.1, 0.5, 1, 2, 3, 5 wt.% of In and 0.01, 0.1, 0.5, 1, 2 wt. % of Te grown by the conventional Bridgman method. The distribution coefficient of Al in the grown GaSe:Al (≥0.1 at.%) crystals has been estimated to be ∼8⋅10-3 and it is within the range of 10-2-10-3 in Er-doped crystals. For the first time, the optimal doping levels have been estimated for Al and Er in GaSe as 0.01- 0.05 at.% for Al and ~ 0.5 wt.% for Er, respectively.

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Yu. Andreev

Tomsk State University

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K. A. Kokh

Russian Academy of Sciences

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Yury M. Andreev

Russian Academy of Sciences

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Anna V. Shaiduko

Russian Academy of Sciences

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Victor V. Atuchin

Novosibirsk State University

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J.-G. Huang

Chinese Academy of Sciences

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Z.-M. Huang

Chinese Academy of Sciences

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A. A. Kotkov

Russian Academy of Sciences

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