Effect of higher order nonlinear optical processes on optical absorption in the photorefractive BSO and BGO crystals |
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| Authors: | R A Ganeev A I Ryasnyanski? R I Tugushev M K Kodirov F R Akhmedzhanov T Usmanov |
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| Institution: | (1) Akadempribor Research and Production Association, Akademgorodok, Tashkent, 700125, Uzbekistan;(2) Navoi State University, Samarkand, 703004, Uzbekistan |
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| Abstract: | The processes of nonlinear refraction and nonlinear absorption are studied in the photorefractive Bi12SiO20 (BSO) and Bi12GeO20 (BGO) crystals at a wavelength of a picosecond Nd:YAG laser of 1064 nm. The nonlinear refraction in the crystals is shown to be related to the Kerr effect, and the nonlinear absorption at this wavelength, to three-photon absorption. The three-photon absorption coefficients of the BSO and BGO crystals are equal, respectively, to (2.5±0.8) ×10?20 and (4.4±1.3) ×10?20 cm3W?2. |
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