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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., Myslivets S. A., Fokin V. A., Volochaev M. N., Smolyarova T. E., Radionov N. V., Zaitsev A. I., Arkhipkin V. G., Chirkin A. S.
Заглавие : Dual wavelength Talbot self-imaging using facet patterned nonlinear crystals
Коллективы : Russian Science Foundation (RSF) [19-12-00203]
Место публикации : Opt. Lett. - 2019. - Vol. 44, Is. 15. - P.3761-3764. - ISSN 0146-9592, DOI 10.1364/OL.44.003761. - ISSN 1539-4794(eISSN)
Примечания : Cited References: 19. - Russian Science Foundation (RSF) (19-12-00203).
Предметные рубрики: RAMAN-NATH DIFFRACTION
LITHOGRAPHY
FIELD
Аннотация: A method for functional patterning of facets of a nonlinear crystal using focused ion beam milling has been developed. The near-field diffraction on periodic gratings has been experimentally and theoretically studied. The periodicity of the structure enables Talbot self-imaging at the fundamental and second-harmonic frequencies simultaneously. Spatial interference patterns for both harmonic frequencies are individual ones, which can enable the higher-accuracy optical testing, coupling the radiation at both frequencies, and wavelength-division demultiplexing. The impact of the aperture effect on a Talbot carpet is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Chirkin A. S.
Заглавие : Frequency doubling in periodic nonlinear photonic crystals mediated by random layers
Место публикации : Opt. Lett.: Optical Society of America, 2017. - Vol. 42, Is. 6. - P.1189-1192. - ISSN 01469592 (ISSN), DOI 10.1364/OL.42.001189
Примечания : Cited References: 26. - Council of the President of the Russian Federation (MK-2908.2015.2); Russian Foundation for Basic Research (RFBR) (15-02-03838). The authors thank I. S. Baturin for fruitful discussions and D. P. Agapov for help.
Ключевые слова (''Своб.индексиров.''): conversion efficiency--crystal structure--efficiency--photonic crystals--ferroelectric crystal--frequency-doubling--intensity oscillations--intermediate layers--nonlinear photonic crystals--periodically poled structures--second harmonics--statistical frequency--frequency doublers
Аннотация: We study the frequency doubling in a quadratic nonlinear photonic crystal consisting of periodically poled structures mediated by uniform layers with random lengths. These structures can be formed by new local impact methods for ferroelectric crystal structuring. The statistical frequency doubling theory is developed for such structures. The effect of the number of random layers and variation in their thicknesses on the second-harmonic conversion efficiency is clarified. It is demonstrated that a proper choice of the intermediate layer thickness can enhance or suppress the conversion efficiency. A new type of the Makerfringes-like second-harmonic intensity oscillations is predicted. © 2017 Optical Society of America.
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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) : Chirkin A. S.
Заглавие : General formula for the natural width of optical parametric oscillator spectral lines
Место публикации : Laser Phys. Lett. - 2020. - Vol. 17, Is. 11. - Ст.115401. - ISSN 1612-2011, DOI 10.1088/1612-202X/abb6e6. - ISSN 1612-202X(eISSN)
Примечания : Cited References: 21
Предметные рубрики: QUANTUM-FLUCTUATIONS
PHASE MEASUREMENTS
STATES
NOISE
Аннотация: A new approach to the quantum analysis of the spectral linewidths of optical parametric oscillators (OPOs) is proposed. The approach is based on introducing a Hermitian frequency deviation operator. The spectral linewidths in the triply resonant OPO above-threshold regime have been calculated. It has been found that the width of the generated spectral line depends on the loss at all interacting frequencies, the photon number of frequency under study, and the threshold photon number of pump. The formula obtained for the spectral width is general; in particular cases, it yields the well-known results. The developed simple approach can be applied to the quantum analysis of the spectra of various oscillatory systems, for example, the multifrequency parametric and non-linear optomechanical interactions and lasers.
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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., 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin A. S.
Заглавие : Theory of noncollinear frequency doubling of transform limited pulses in non-steady-state regime
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2016. - Vol. 33, Is. 11. - P.2308-2312. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.33.002308
Примечания : Cited References: 22. - Council of the President of the Russian Federation (MK-2908.2015.2); Russian Foundation for Basic Research (RFBR) (15-02-03838); Krasnoyarsk Regional Fund for Science and Technical Activity Support.The authors thank I. V. Timofeev for the fruitful discussions and theoretical support.
Ключевые слова (''Своб.индексиров.''): band structure--frequency doublers--gaussian beams--nonlinear optics--phase matching--analytical expressions--frequency-doubling--interaction geometries--intersection angles--parametric interactions--phase matching conditions--spectral bandwidth--transform-limited pulse--harmonic generation
Аннотация: Noncollinear second-harmonic generation from two ultrashort pulses intersecting in a nonlinear medium is studied in spectral and time domains. We derive analytical expressions for the second-harmonic (SH) amplitude in crystals of finite thickness neglecting diffraction. The contribution from characteristics of the fundamental radiation and interaction geometry to the process is analyzed. In addition, refined phase-matching conditions are obtained. We find that the spectral bandwidth is determined by the intersection angle and can be enlarged. The SH pulse duration can be optimized by varying the fundamental beam size and the intersection angle. It is found that the SH beam excited by a Gaussian fundamental beam becomes elliptical. It is shown that the fundamental pulse duration can be readily characterized with single pulses by means of measuring the ellipticity of the SH beam profile. The approach developed can potentially be used to calculate parametric interactions of fundamental pulses with an arbitrary spectrum. © 2016 Optical Society of America.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin, A. S.
Заглавие : Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction
Коллективы : Council of the President of the Russian Federation [MK-2908.2015.2]; Russian Foundation for Basic Research (RFBR) [15-02-03838]
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2015. - Vol. 32, Is. 12. - P.2411-2416. - ISSN 0740-3224, DOI 10.1364/JOSAB.32.002411. - ISSN 1520-8540(eISSN)
Примечания : Cited References:31. - Council of the President of the Russian Federation (MK-2908.2015.2); Russian Foundation for Basic Research (RFBR) (15-02-03838).
Предметные рубрики: FEMTOSECOND LASER-PULSES
POLED LITHIUM-NIOBATE
PHOTONIC CRYSTAL
COMPRESSION
CONVERSION
Аннотация: We analyze second-harmonic generation (SHG) in a two-dimensional nonlinear optical superlattice (NLOS) with its modulation period being chirped in the propagation direction and constant in the transverse direction. This results in efficient multiple SHG via nonlinear Raman–Nath diffraction. We obtain exact analytical expressions for a SH amplitude generated in chirped 2D NLOSs and for its quasi-phase-matching bandwidth. The results of analytical calculations are in excellent agreement with the numerical ones. We show that the process is robust to angular deviations of NLOS and it can be applied to enable tunable and broadband frequency conversion.
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