Abstract
Еsents the research results of biaxial crystals with mm2 symmetry class. These crystals were used for determining regularities of nonlinear conversion of broadband optical emission on the basis of collinear and vector light waves interactions of different nature. The quantities of the basis nonlinear optical characteristics of KTP (KTiOPO4) and banana (Ba2NaNb5O15) crystals were calculated in case of synchronous conversion of broadband emission from the area of 0.8 – 2.8 micron to the visible spectrum of 0.4 – 0.7 micron. The nonlinear optical characteristics of KTP crystals are defined by their geometrical structure, the mode of interaction of light waves, and the infra-red spectrum width, that was experimentally confirmed on KTP crystal. The quality characteristics β were calculated for the KTP crystal. For banana crystal the angle of phase synchronism θc changes insignificantly when the observation plane is changed. It can be explained by the fact that the biaxiality of crystal is not strongly expressed, because of the basis refraction indices the conditions nz≤ny≈nx are performed.
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