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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Aleksandrovsky A. S., Zaitsev A. I., Slabko V. V.
Заглавие : Cerenkov nonlinear diffraction of femtosecond pulses
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2013. - Vol. 30, Is. 7. - P.2014-2021. - ISSN 0740-3224, DOI 10.1364/JOSAB.30.002014
Примечания : Cited References: 43. - The work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, by RFBR through Grant No. 12-02-31167, by the Ministry of Education and Science of the Russian Federation (Contract No. 14.B37.21.0730), by Krasnoyarsk Regional Fund of Science and Technical Activity Support, by PSB RAS Project 2.5.2, and by SFU Grant F12.
Предметные рубрики: STRONTIUM BARIUM NIOBATE
2ND-HARMONIC GENERATION
PHOTONIC CRYSTAL
DOMAIN-WALLS
MODULATION
Аннотация: Cerenkov nonlinear diffraction of femtosecond pulses in one-dimensional nonlinear photonic crystal of strontium tetraborate was studied theoretically and experimentally in both frequency and time domains. Spectral features of second harmonic radiation were measured in the course of mapping the nonlinear photonic crystal structure. The local second harmonic spectrum demonstrates complex angular behavior within the beam cross section. The spectral width of the second harmonic radiation is found to be fundamental beam size-dependent, and optimal focusing should be used for exact conversion of the fundamental spectrum into the second harmonic one. Experimental results are in excellent agreement with calculations. Maximum second harmonic generation efficiency was up to 2.1% at pumping by a femtosecond oscillator. (C) 2013 Optical Society of America
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vyunishev A. M., Aleksandrovsky A. S., Zaitsev A. I., Slabko V. V.
Заглавие : Cerenkov nonlinear diffraction of femtosecond pulses in random nonlinear photonic crystal
Коллективы : Russia-Taiwan School-Seminar on Nonlinear Optics and Photonics (3; 2013 ; Jun. ; 14-18; Владимир/ Суздаль)
Место публикации : Third Russia-Taiwan School-Seminar on Nonlinear Optics and Photonics : Program and Book of Abstracts. - 2013. - Ст.S1-11-O30. - P.20
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Chirkin A. S.
Заглавие : Cherenkov second harmonic generation of femtosecond laser pulses in a homogeneous nonlinear crystal
Место публикации : Laser Phys. - 2024. - Vol. 34, Is. 8. - Ст.085402. - ISSN 1054660X (ISSN), DOI 10.1088/1555-6611/ad5156. - ISSN 15556611 (eISSN)
Примечания : Cited References: 37
Аннотация: In experiments on second harmonic (SH) generation (SHG), a conical structure of radiation has been observed. In the present study, a non-stationary theory of SH excitation of ultrashort laser pulses with phase modulation has been developed, which explains the properties of such a structure as Cherenkov radiation. Under phase-mismatched interactions, a maximum of the SH spectrum is observed at the Cherenkov angle, which is determined by the ratio of the SH and laser radiation phase velocities. It is shown that tightly focused laser beams are preferred to observe Cherenkov SHG. The SH spectral width depends on the group velocity mismatch and is more complicated on the excited radiation spectrum. The SH energy can be proportional to the crystal length or group delay length depending on their ratio. We also demonstrate that a complex angular distribution of spectral components (an angular chirp) appears within the SH cross-section.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin A. S.
Заглавие : Frequency doubling of femtosecond laser pulses in three dimensional nonlinear photonic crystals
Колич.характеристики :6 с
Место публикации : Laser Phys. Lett. - 2023. - Vol. 20, Is. 3. - Ст.035402. - ISSN 16122011 (ISSN), DOI 10.1088/1612-202X/acb7f5. - ISSN 1612202X (eISSN)
Примечания : Cited References: 20. - This work was supported by the Russian Science Foundation (Grant # 19-12-00203). The authors thank N Davletshin for graphical illustration of NPC
Аннотация: Quasi-phase matched nonlinear frequency conversion in three dimensional nonlinear photonic crystals (NPCs) has been considered for implementation of the second harmonic generation of transform-limited and chirped femtosecond laser pulses. Spatial distribution of the second harmonic intensity is shown to be caused by Cherenkov- and Raman–Nath-type nonlinear diffraction. These types of nonlinear diffraction may occur simultaneously resulting in an efficient multi-order nonlinear diffraction in the Bragg regime, which can be realized by a proper choice of the modulation period of NPC structure in longitudinal direction for considered transverse diffraction order. Three dimensional NPCs open up new possibilities for ultrafast nonlinear photonics and parametric interactions in optics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunisheva S. A., Myslivets S. A., Davletshin, Nikolay N., Eremeeva, Elena V., Vysotski, Eugene S., Pavlov, Igor N., Vyunishev A. M.
Заглавие : Intracavity enhancement of GFP fluorescence induced by femtosecond laser pulses
Колич.характеристики :5 с
Место публикации : Spectrochim. Acta A. - 2023. - Vol. 300. - Ст.122885. - ISSN 13861425 (ISSN), DOI 10.1016/j.saa.2023.122885. - ISSN 18733557 (eISSN)
Примечания : Cited References: 23
Аннотация: The phenomenon of fluorescence is widely used in molecular biology for studying the interaction of light with biological objects. In this article, we present an experimental investigation of the enhancement of laser-induced fluorescence of Clytia gregaria green fluorescent protein. The laser-induced fluorescence method applied in our work combines the advantages of femtosecond laser pulses and a photonic crystal cavity, with the time dependence of the fluorescence signal studied. It is shown that a green fluorescent protein solution placed in a microcavity and excited by femtosecond laser pulses leads to an increase in fluorescence on the microcavity modes, which can be estimated by two orders of magnitude. The dependences of fluorescence signal saturation on the average integrated optical pump power are demonstrated and analyzed. The results obtained are of interest for the development of potential applications of biophotonics and extension of convenient methods of laser-induced fluorescence.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Baturin I. S., Akhmatkhanov A. R., Shur, V. Ya, Chirkin A. S.
Заглавие : Multiple nonlinear Bragg diffraction of femtosecond laser pulses in a χ(2) photonic lattice with hexagonal domains
Коллективы : Russian Foundation for Basic Research [15-02-03838]; Government of the Russian Federation (Act 211) [02.A03.21.0006]
Место публикации : Laser Phys. Lett. - 2018. - Vol. 15, Is. 4. - Ст.045401. - ISSN 1612-2011, DOI 10.1088/1612-202X/aaa618. - ISSN 1612-202X(eISSN)
Примечания : Cited References:26. - The work was supported by the Russian Foundation for Basic Research through grant 15-02-03838. ISB, ARA and VYS acknowledge the support of the Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006).
Предметные рубрики: RAMAN-NATH DIFFRACTION
STRUCTURED FUNDAMENTAL WAVE
2ND-HARMONIC
Ключевые слова (''Своб.индексиров.''): nonlinear bragg diffraction--nonlinear photonic lattice--second harmonic--generation--femtosecond pulses
Аннотация: The frequency doubling of femtosecond laser pulses in a two-dimensional (2D) rectangular nonlinear photonic lattice with hexagonal domains is studied experimentally and theoretically. The broad fundamental spectrum enables frequency conversion under nonlinear Bragg diffraction for a series of transverse orders at a fixed longitudinal quasi-phase-matching order. The consistent nonstationary theory of the frequency doubling of femtosecond laser pulses is developed using the representation based on the reciprocal lattice of the structure. The calculated spatial distribution of the second-harmonic spectral intensity agrees well with the experimental data. The condition for multiple nonlinear Bragg diffraction in a 2D nonlinear photonic lattice is offered. The hexagonal shape of the domains contributes to multibeam second harmonic excitation. The maximum conversion efficiency for a series of transverse orders in the range 0.01%-0.03% is obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Chirkin, A. S.
Заглавие : Multiple quasi-phase-matching in nonlinear Raman-Nath diffraction
Коллективы : Russian Federation [MK-2908.2015.2], RFBR [15-02-03838]
Место публикации : Opt. Lett.: Optical Society of America, 2015. - Vol. 40, Is. 7. - P.1314-1317. - ISSN 0146, DOI 10.1364/OL.40.001314. - ISSN 15394794(eISSN)
Примечания : Cited References:18. - The work was partially supported by the Grant of the President of the Russian Federation MK-2908.2015.2 and by RFBR Grant No. 15-02-03838.
Предметные рубрики: Femtosecond laser-pulses
2nd-harmonic generation
Photonic crystal
Аннотация: The method of the superposition of a nonlinearity modulation is employed to design a two-dimensional (2D) nonlinear photonic lattice for efficient multiple quasi-phase-matched second harmonic generation in the process of nonlinear Raman-Nath diffraction (NRND). An analytical solution is proposed to calculate the second harmonic intensity in rectangular 2D lattices. This approach can be useful for the generation of multiple second harmonic beams with the efficiency a few orders of magnitude higher than in the case of nonphase-matched generation via NRND.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Slabko V. V., Baturin I. S., Akhmatkhanov A. R., Shur V. Y.
Заглавие : Nonlinear Raman-Nath diffraction of femtosecond laser pulses
Коллективы : Russian Federation [MK-250.2013.2]; Krasnoyarsk Regional Fund for Science and Technical Activity Support; RAS grant [24.31]; Ural Federal University Development Program
Место публикации : Opt. Lett.: Optical Society of America, 2014. - Vol. 39, Is. 14. - P.4231-4234. - ISSN 0146-9592, DOI 10.1364/OL.39.004231. - ISSN 1539-4794
Примечания : Cited References: 22. - This work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, Krasnoyarsk Regional Fund for Science and Technical Activity Support and by the RAS grant no. 24.31. A. A. acknowledges the financial support of young scientists through the Ural Federal University Development Program. The authors thank A. S. Chirkin and I. V. Timofeev for fruitful discussions and A. V. Barannik for optical microscopy of the samples.
Предметные рубрики: STRONTIUM BARIUM NIOBATE
2nd-HARMONIC GENERATION
PHOTONIC STRUCTURES
DOMAIN-STRUCTURE
LITHIUM-NIOBATE
CRYSTAL
Аннотация: We study the nonlinear Raman–Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes observed in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Čerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Slabko V. V., Baturin I. S., Akhmatkhanov A. R., Shur, V. Ya., Chirkin A. S.
Заглавие : Nonlinear Raman-Nath diffraction of femtosecond laser pulses in a 2D nonlinear photonic crystal
Коллективы : Council of the President of the Russian Federation [MK-2908.2015.2], Ministry of Education and Science of the Russian Federation [2014/7, UID RFMEFI59414X0011], Russian Foundation for Basic Research (RFBR) [13-02-01391-a, 14-02-01160-a, 15-02-03838]
Место публикации : Opt. Lett.: Optical Society of America, 2015. - Vol. 40, Is. 17. - P.4002-4005. - ISSN 0146, DOI 10.1364/OL.40.004002. - ISSN 15394794(eISSN)
Примечания : Cited References:27. - Council of the President of the Russian Federation (MK-2908.2015.2); Ministry of Education and Science of the Russian Federation (2014/7, UID RFMEFI59414X0011); Russian Foundation for Basic Research (RFBR) (13-02-01391-a, 14-02-01160-a, 15-02-03838).
Предметные рубрики: POLED LITHIUM-NIOBATE
2ND-HARMONIC GENERATION
BEAMS
Аннотация: We study second-harmonic generation (SHG) of femtosecond laser pulses in a rectangular two-dimensional nonlinear photonic crystal (NLPC). Multiple SH beams were observed in the vicinity of the propagation direction of the fundamental beam. It has been verified that the angular positions of these beams obey the conditions of nonlinear Raman-Nath diffraction (NRND). The measured SH spectra of specific NRND orders consist of narrow peaks that experience a high-frequency spectral shift as the order grows. We derive an analytical expression for the process studied and find the theoretical results to be in good agreement with the experimental data. We estimate the enhancement factor of nonlinear Raman-Nath diffraction in 2D NLPC to be 70. (C) 2015 Optical Society of America
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Vyunishev A.M., Zaitsev A.I., Slabko V.V.
Заглавие : Random quasi-phase-matched conversion of broadband radiation in a nonlinear photonic crystal
Место публикации : Phys. Rev. A. - 2010. - Vol. 82, Is. 5. - ISSN 1050-2947, DOI 10.1103/PhysRevA.82.055806
Примечания : Cited Reference Count: 22. - Гранты: The work was supported by the Ministry of Education and Science of the Russian Federation (Contract 16.740.11.0150), Grant of the President of the Russian Federation for the support of leading scientific schools No. SS-4645.2010.2, Grant No. RNP.2.1.1.3455, Projects 2.5.2 and 3.9.1 of PSB RAS, and Projects No. 27.1 and No. 5 of SB RAS. A. M. Vyunishev is grateful for the support from Krasnoyarsk Regional Fund of Science and Technical Activity Support.Финансирующая организация: Ministry of Education and Science of the Russian Federation [16.740.11.0150]; Russian Federation for the support of leading scientific schools [SS-4645.2010.2, RNP.2.1.1.3455]; PSB RAS [2.5.2, 3.9.1]; SB RAS [27.1, 5]; Krasnoyarsk Regional Fund of Science and Technical Activity
Ключевые слова (''Своб.индексиров.''): broad spectrum--broadband radiation--femtosecond laser pulse--fundamental wave--nonlinear generation--nonlinear photonic crystals--quasi-phase-matched--quasi-phase-matched frequency doubling--red shift--shorter wavelength--tetraborate--tuning ranges--vacuum ultraviolets--band structure--crystal structure--strontium--ultrafast lasers--ultrashort pulses--photonic crystals
Аннотация: Radiation in the range 187.5-215 nm was generated via random quasi-phase-matched frequency doubling of femtosecond laser pulses in nonlinear photonic crystals of strontium tetraborate. Abroad spectrum of fundamental radiation favors the probing of the nonlinear photonic crystal band structure. The red shift of the band structure upon the fundamental wave-vector rotation was observed. No principal limitations of the tuning range at its shorter wavelength boundary from the nonlinear photonic crystal (NPC) material are found. Calculation shows that the NPC structure enables enhancement of nonlinear generation in the vacuum ultraviolet.
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