Effect of postgrowth processing technology and laser radiation parameters at wavelengths of 2091 and 1064 nm on the laser-induced damage threshold in ZnGeP2 single crystal
| Autor: | Oleg L. Antipov, I.D. Eranov, A. I. Gribenyukov, M.P. Zykova, L.A. Voronin, N. N. Yudin, E.V. Zhuravleva, S. N. Podzyvalov, Mikhail Zinoviev |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
лазерно-индуцированное разрушение business.industry Statistical and Nonlinear Physics Radiation Laser монокристаллы Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention оптическое повреждение Wavelength law Optoelectronics Electrical and Electronic Engineering business Single crystal |
| Zdroj: | Quantum electronics. 2021. Vol. 51, № 4. P. 306-316 |
| ISSN: | 1468-4799 1063-7818 |
| Popis: | We report a study of the effect of postgrowth treatment of ZnGeP2 single crystals (low-temperature annealing, irradiation with fast electrons, polishing of working surfaces) and the conditions of exposure to repetitively pulsed laser radiation [wavelength (2091 or 1064 nm), pulse repetition rate, beam diameter, exposure time, sample temperature] on the laser-induced damage threshold (LIDT) of the surfaces of these crystals. It is found that thermal annealing of ZnGeP2 single crystals and their irradiation with a flux of fast electrons, which increase the LIDT at a wavelength of λ = 1064 nm, do not lead to a change in this threshold at λ = 2091 nm. It is shown that ZnGeP2 elements with lower optical losses in the spectral range 0.7 – 2.5 μm have a higher LIDT at λ = 2091 nm both immediately after fabrication and after postgrowth processing. An increase in the threshold energy density of laser radiation by a factor of 1.5 – 3 at λ = 2091 nm is revealed with a decrease in the crystal temperature from zero to –60 °C. The fact of reversible photodarkening of the propagation channel of laser radiation in ZnGeP2 in the predamage region of parameters is established by the method of digital holography. |
| Databáze: | OpenAIRE |
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