Snetkov Il'ya L'vovich

Solid-state lasers with high average power and diffraction quality of radiation, thermal effects in crystalline, glass and ceramic optical elements and methods for their attenuation and compensation, Faraday devices, interferometry.

• 2001-2007 - Lobachevsky State University of Nizhny Novgorod, Advanced School of General and Applied Physics.
• 2005 - Bachelor of Physics.
• 2007 - Master of Physics.
• 2007–2011 - postgraduate studies, Institute of Applied Physics RAS.
• 2015 - Ph.D. thesis "Various ways to compensate for thermally induced radiation distortions in the optical elements of lasers", scientific supervisor - O.V. Palashov.

Associate Professor, Lobachevsky State University of Nizhny Novgorod. Practical seminars on the course "Physical Optics" Laboratory practice on the course "Laser Physics". Ph.D. was prepared: 1.

Institute of Applied Physics RAS:

• 2005-2007 - Senior Research Assistant;
• 2007–2016 - Junior Researcher;
• 2016–2019 - Researcher;
• 2019 - present day - Senior Researcher

• Member of the Nizhny Novgorod student branch of SPIE (2008–2011).
• Member of the OSA Student Branch at the Institute of Applied Physics RAS (2009–2011).

• 2009–2010 - scholarship named after academician G. A. Razuvaev.
• 2009 - an incentive diploma for a report at the 14th Nizhny Novgorod session of young scientists.
• 2011, September, 21-23 - Diploma for the best poster presentation at the international conference “Nonlinear Optics: East-West Reunion”.
• III degree diploma at the XV Competition of works of young scientists of the IAP RAS.
• Grant of the President of the Russian Federation for state support of young Russian scientists - candidates of science.
• Member of the team of the mega-grant of the government of the Russian Federation in order to create a "Laboratory for diagnostics of new optical materials for promising lasers."
• 2013 - Medal of the Russian Academy of Sciences with a prize for young scientists of the Russian Academy of Sciences.

A model of thermooptical effects in laser ceramics is constructed, taking into account the random nature of the orientation of the crystallographic axes in the ceramic grains. Analytical expressions are obtained for the thermally induced phase, as well as its mean value and dispersion. The effect of modulation of the phase of a beam with a characteristic transverse size of the order of the grain size is predicted. It is shown that the deterioration of the beam quality parameters associated with this effect is inversely proportional to the ratio of the length of the ceramic element to the grain size. The effect of small-scale phase modulation in the cross-section of the beam has been experimentally demonstrated and studied using CaF2 ceramics as an example.

1. I.L. Snetkov, I.B. Mukhin, O.V. Palashov, and E.A. Khazanov, "Properties of a thermal lens in laser ceramics" // Quantum. Electron. vol. 37, pp. 633-638, 2007. WOS:000250718600008. DOI: 10.1070%2FQE2007v037n07ABEH013477
2. A.A. Soloviev, I.L. Snetkov, V.V. Zelenogorsky, I.E. Kozhevatov, O. Palashov, and E.A. Khazanov “Experimental study of thermal lens features in laser ceramics” // Optics Express Vol. 16, Iss. 25, pp. 21012–21021 (2008). WOS:000261563100088. DOI: 10.1364/OE.16.021012
3. И.Л. Снетков, А.А. Соловьев, Е.А. Хазанов «Исследование тепловой линзы в тонких дисках из лазерной керамики» // Квантовая электроника, 39:4 (2009), 302–308. WOS:000269051200002. DOI: 10.1070%2FQE2009v039n04ABEH013956

Methods of compensation for thermally induced depolarization of radiation in Faraday isolators have been studied and improved. A new scheme of a Faraday isolator with compensation for thermally induced birefringence, based on the use of an additional compensating element outside the magnetic field, is proposed.

1. Ilya Snetkov, Ivan Mukhin, Oleg Palashov, and Efim Khazanov “Compensation of thermally induced depolarization in Faraday isolators for high average power lasers” // Optics Express Vol. 19, Iss. 7, pp. 6366–6376 (2011). WOS:000288852700070. DOI: 10.1364/OE.19.006366
2. Ilya Snetkov, Oleg Palashov “Compensation of thermal effects in Faraday isolator for high average power lasers” // Applied Physics B, Vol. 109, Iss. 2, pp. 239–247 (2012). WOS:000310887100010. DOI: 10.1007/s00340-012-5183-6
3. A.V. Starobor, I.L. Snetkov, and O.V. Palashov, "TSAG-based Faraday isolator with depolarization compensation using a counterrotation scheme" Opt. Lett. vol. 43, pp. 3774-3777, 2018. WOS:000440405900080. DOI: 10.1364/OL.43.003774

Methods for compensating for thermally induced depolarization of radiation in active elements and passive optics of high-power solid-state lasers are studied. Original compensation methods were proposed.

1. A.G. Vyatkin, I.L. Snetkov, O.V. Palashov, and E.A. Khazanov “Self-compensation of thermally induced depolarization in CaF2 and definite cubic single crystals” // Opt. Express Vol. 21, Issue 19, pp. 22338–22352 (2013). WOS:000325547200059. DOI: 10.1364/OE.21.022338
2. Ilya L. Snetkov, Vitaly V. Dorofeev, and Oleg V. Palashov “The effect of full compensation of thermally induced depolarization in two nonidentical laser elements” // Opt. Lett., 41(10) p. 2374–2377 (2016). WOS:000375747600062. DOI: 10.1364/OL.41.002374

A method for the experimental determination of the magnitude and sign of the optical anisotropy parameter ξ of cubic crystals with the symmetry 432, and m3m (garnets, fluorides, etc.) has been developed. The values of ξ were measured in a number of crystals and their dependences on wavelength and temperature.

1. Ilya Snetkov, Anton Vyatkin, Oleg Palashov, and Efim Khazanov “Drastic reduction of thermally induced depolarization in CaF2 crystals with [111] orientation” // Optics Express, Vol. 20, Issue 12, pp. 13357–13367 (2012).
2. I.L. Snetkov, R. Yasuhara, A.V. Starobor, E.A. Mironov, and O.V. Palashov “Thermo-Optical and Magneto-Optical Characteristics of Terbium Scandium Aluminum Garnet Crystals” // IEEE Quantum Electron. Vol. 51, number 7, 7000307-1– 7000307-7 (2015). WOS:000355929300001. DOI: 10.1109/JQE.2015.2431611
3. I.L. Snetkov, A.I. Yakovlev and O.V. Palashov “CaF2, BaF2 and SrF2 crystals' optical anisotropy parameters” // Laser Phys. Lett., Vol.12, Num. 9, p. 095001 (2015). WOS:000360987200001. DOI: 10.1088/1612-2011/12/9/095001
4. I. Snetkov , A. Yakovlev, and O. Palashov “Temperature dependence of optical anisotropy parameter of CaF2, BaF2 and SrF2 materials” // Opt. Mater. 69, 291–294 (2017). WOS:000404305200043. DOI: 10.1016/j.optmat.2017.04.056
5. A. Yakovlev and I. Snetkov, "Thermal lens astigmatism in glass and in cubic crystals with [001] orientation" // Opt. Lett. vol. 45, pp. 6783-6786, (2020). DOI: 10.1364/ol.412108

**The analysis of the dependence of thermally induced depolarization on the orientation of crystallographic axes in crystalline materials with ξ <0 in the presence of Faraday rotation (the case of Faraday devices) is carried out. **

1. I.L. Snetkov “Features of Thermally Induced Depolarization in Magneto-Active Media With Negative Optical Anisotropy Parameter” // IEEE J. Quantum Electron. vol. 54, issue 2, pp. 1–8 (2018). WOS:000426342000001. DOI: 10.1109/JQE.2018.2802466
2. Snetkov I.L. “Compensation for Thermally Induced Depolarization in Magneto-Optical Media Made of Materials With a Negative Optical Anisotropy Parameter“ // IEEE J. Quantum Elect. V. 57, P. 1-8 (2021). WOS:00068111640000. DOI: 10.1109/JQE.2018.2802466

Faraday isolators for high-power laser radiation with record characteristics have been realized and studied. 1 micron

1. E.A. Mironov, I.L. Snetkov, A.V. Voitovich, and O.V. Palashov, "Permanent-magnet Faraday isolator with the field intensity of 25 kOe," Quantum Electron. vol. 43, pp. 740-743, 2013. WOS:000323816700010. DOI: 10.1070/QE2013v043n08ABEH015122
2. I.L. Snetkov, A.V. Voitovich, O.V. Palashov, and E.A. Khazanov “Review of Faraday Isolators for Kilowatt Average Power Lasers” // IEEE J. Quantum Elect. vol. 50, issue 6, pp. 434–443 (2014). WOS:000335562600001. DOI: 10.1109/JQE.2014.2317231
3. Ryo Yasuhara, I. Snetkov, A. Starobor, and O. Palashov “Terbium gallium garnet ceramic-based Faraday isolator with compensation of thermally induced depolarization for high-energy pulsed lasers with kilowatt average power” // Appl. Phys. Lett. 105, pp. 241104 (2014). WOS:000346643600004. DOI: 10.1063/1.4904461
4. Ryo Yasuhara, Ilya Snetkov, Aleksey Starobor, Еvgeniy Mironov, and Oleg Palashov “Faraday rotator based on TSAG crystal with <001> orientation” // Opt. Exp. Vol. 24, Issue 14, pp. 15486–15493 (2016). WOS:000381770500045. DOI: 10.1364/OE.24.015486
5. A.V. Starobor, I.L. Snetkov, and O.V. Palashov “TSAG-based Faraday isolator with depolarization compensation using a counterrotation scheme” // Opt. Lett. 43(15), pp. 3774–3777 (2018). WOS:000440405900080. DOI: 10.1364/OL.43.003774 2 micron
6. 1. Snetkov, A. Yakovlev, “Faraday isolator based on crystalline silicon for 2-µm laser radiation“ // Opt. Lett. 47(7) 1895-1898 (2022) DOI:10.1364/OL.452218

The magneto-optical and thermo-optical properties of promising magneto-optical materials have been investigated.

Tb2O3

1. I.L. Snetkov, D.A. Permin, S.S. Balabanov, and O.V. Palashov “Wavelength dependence of Verdet constant of Tb3+:Y2O3 ceramics” // Appl. Phys. Lett. vol. 108, p. 161905 (2016). WOS:000375053000015. DOI: 10.1063/1.4947432
2. I.L. Snetkov, and O.V. Palashov “Cryogenic temperature characteristics of Verdet constant of terbium sesquioxide ceramics” // Opt. Mater. 62, pp. 697–700 (2016). WOS:000390735400099. DOI: 10.1016/j.optmat.2016.10.049
3. S.S. Balabanov, D.А. Permin, E.Ye. Rostokina, O.V. Palashov, I.L. Snetkov “Characterizations of REE:Tb2O3 magneto-optical ceramics“ // Phys. Status Solidi (b) pp. 1900474, (2020). DOI: 10.1002/pssb.201900474

Dy2O3

4. I.L. Snetkov, A.I. Yakovlev, D.A. Permin, S.S. Balabanov, and O.V. Palashov “Magneto-optical Faraday effect in dysprosium oxide (Dy2O3) based ceramics obtained by vacuum sintering” // Opt. Lett. 43(16) pp. 4041–4044 (2018). WOS:000441505100060. DOI: 10.1364/OL.43.004041
5. A. Yakovlev, I. Snetkov, D. Permin, S. Balabanov, and O. Palashov “Faraday rotation in cryogenically cooled dysprosium based (Dy2O3) ceramics” // Scripta Materialia 161, pp. 32–35 (2019). DOI: 10.1016/j.scriptamat.2018.10.011

CeF3

5. E.A. Mironov, A.V. Starobor, I.L. Snetkov, O.V. Palashov, H. Furuse, S. Tokita, and R. Yasuhara “Thermo-optical and magneto-optical characteristics of CeF3 crystal” // Opt. Mater. 69, pp. 196–201 (2017). WOS:000400200000016. DOI: 10.1016/j.optmat.2017.04.034
6. A. Starobor, E. Mironov, I. Snetkov, O. Palashov, H. Furuse, S. Tokita, and R. Yasuhara “Cryogenically cooled CeF3 crystal as media for high-power magneto-optical devices” // Opt. Lett. 42, pp. 1864–1866 (2017). WOS:000400487700056. DOI: 10.1364/OL.42.001864

TSAG

7. I.L. Snetkov, R. Yasuhara, A.V. Starobor, E.A. Mironov, and O.V. Palashov “Thermo-Optical and Magneto-Optical Characteristics of Terbium Scandium Aluminum Garnet Crystals” // IEEE Quantum Electron. Vol. 51, number 7, 7000307-1–7000307-7 (2015). WOS:000355929300001. DOI: 10.1109/JQE.2015.2431611

TeO2

8. Yakovlev A.I., Snetkov I.L., Dorofeev V.V., Motorin S.E. “Magnetooptical properties of high-purity zinc-tellurite glasses” // J. Non-Cryst. Solids, 480, pp. 90–94 (2018). WOS:000419409700017. DOI: 10.1016/j.jnoncrysol.2017.08.026

Er2O3

9. A. Yakovlev, S. Balabanov, D. Permin, M. Ivanov, I. Snetkov, “Faraday rotation in Er2O3 based ceramics“ // Optical Materials, Vol. 101, 109750, 2020. WOS:000527936300042. DOI: 10.1016/j.optmat.2020.109750

Ho2O3

10. S. Balabanov, S. Filofeev, M. Ivanov, A. Kaigorodov, D. Kuznetsov, D.J. Hu, J. Li, O. Palashov, D. Permin, E. Rostokina, I. Snetkov “Fabrication and characterizations of holmium oxide based magneto-optical ceramics“ // Optical Materials, Vol. 101, 109741, 2020. WOS:000527936300033. DOI: 10.1016/j.optmat.2020.109741
11. 4. Hu, X. Li, I. Snetkov, A. Yakovlev, S. Balabanov, M. Ivanov, X. Liu, Z. Liu, F. Tian, T. Xie, O. Palashov, J. Li, “Fabrication, microstructure and optical characterizations of holmium oxide (Ho2O3) transparent ceramics“ , J. European Ceram. Soc. 41(1) 759-767 (2021) DOI: 10.1016/j.jeurceramsoc.2020.08.008

Yb2O3

12. D.A. Permin, A.V. Novikova, V.A. Koshkin, S.S. Balabanov, I.L. Snetkov, O.V. Palashov, and K.E. Smetanina, "Fabrication and Magneto-Optical Properties of Yb2O3 Based Ceramics" // Magnetochem. 6, 63 (2020). DOI: 10.3390/magnetochemistry6040063

The optical and laser properties have been investigated and lasing has been realized on domestic and foreign laser ceramics.

1. I.L. Snetkov, D.E. Silin, O.V. Palashov, E.A. Khazanov, H. Yagi, T. Yanagitani, H. Yoneda, A. Shirakawa, K.-i. Ueda, and A. A. Kaminskiy “Study of the thermo-optical constants of Yb doped Y2O3, Lu2O3 and Sc2O3 ceramic materials” // Opt. Express Vol. 21, Issue 18, pp. 21254–21263 (2013). WOS:000324867100088. DOI: 10.1364/OE.21.021254
2. I.L. Snetkov, I.B. Mukhin, S.S. Balabanov, D.A. Permin, and O.V. Palashov, "Efficient lasing in Yb:(YLa)2O3 ceramics," // Quantum Electron. 45, 95-97 (2015). WOS:000350966100001. DOI: 10.1070/QE2015v045n02ABEH015652
3. I.L. Snetkov, I.B. Mukhin, and O.V. Palashov, "Comparative characteristics of Yb:(YLa)2O3 laser ceramics" // Quantum Electron. 46, 193-196 (2016). WOS:000378171200002. DOI: 10.1070/QEL15983
4. I.L. Snetkov, O. V. Palashov, V.V. Osipov, I.B. Mukhin, R.N. Maksimov, V.A. Shitov, and K.E. Luk'yashin, "Investigation of lasing characteristics of domestic Yb : YAG laser ceramics" // Quantum Electron. 46, 586–588 (2016). WOS:000380954300002. DOI: 10.1070/QEL16115
5. I.L. Snetkov, Ding Zhou, A.I. Yakovlev, M. Volkov, I.I. Kuznetsov, I.B. Mukhin, O.V. Palashov, Ying Shi, and Ken-ichi Ueda “Laser generation on Yb:LuAG ceramics produced by nanocrystalline pressure-less sintering in H2 method” // Laser Phys. Lett. 15, 035801 (2018). WOS:000424229000001. DOI: 10.1088/1612-202X/aa8580
6. I.L. Snetkov, O.V. Palashov, V.V. Osipov, I.B. Mukhin, R.N. Maksimov, V.A. Shitov, and K.E. Luk'yashin, "Continuous-wave 80-W lasing in Yb : YAG ceramics" // Quantum Electron. 48, 683 (2018). WOS:000442892500001. DOI: 10.1070/QEL16727
7. R.N. Maksimov, V.A. Shitov, M.R. Volkov, O.L. Vadimova, and I.L. Snetkov, "Spectroscopic and laser characteristics of ceramics based on Yb3+-doped Lu2O3 – Y2O3 solid solution" // Quantum Electron. 48, 695 (2018). WOS:000442892500004. DOI: 10.1070/QEL16716
8. D.A. Permin, S.S. Balabanov, A.V. Novikova, I.L. Snetkov, O.V. Palashov, A.A. Sorokin, and M.G. Ivanov “Fabrication of Yb-doped Lu2O3-Y2O3-La2O3 solid solutions transparent ceramics by self-propagating high-temperature synthesis and vacuum sintering” // Ceram. Int. 45(1), pp. 522–529 (2019). DOI: 10.1016/j.ceramint.2018.09.204
9. D.A. Permin, S.S. Balabanov, I.L. Snetkov, O.V. Palashov, A.V. Novikova, O.N. Klyusik, and I.V. Ladenkov, “Hot pressing of Yb:Sc2O3 laser ceramics with LiF sintering aid“ // Opt. Mater. vol. 100, p. 109701, 2020. DOI: j.optmat.2020.109701