Effect of higher order nonlinear optical processes on optical absorption in the photorefractive BSO and BGO crystals
R. A. GaneevAkadempribor Research and Production Association, Akademgorodok, Tashkent, 700125, UzbekistanA. I. Ryasnyanskiı̆Navoi State University, Samarkand, 703004, UzbekistanR. I. TugushevAkadempribor Research and Production Association, Akademgorodok, Tashkent, 700125, UzbekistanМ. К. КодировNavoi State University, Samarkand, 703004, UzbekistanFarkhad AkhmedzhanovNavoi State University, Samarkand, 703004, UzbekistanT. UsmanovAkadempribor Research and Production Association, Akademgorodok, Tashkent, 700125, Uzbekistan
ABI
Annotatsiya
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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