Cs/sub 2/BX/sub 4/(B=Cd, Hg; X=Br, Cl) crystals- highly efficient acoustooptical materials

Summary form only given. The photoelastic and acoustooptical parameters of Cs/sub 2/HgBr/sub 4/ and Cs/sub 2/CdBr/sub 4/ crystals are determined on the base of study of the thermal expansion, optical indicatrix rotation at ferroelastic phase transition and direct piezooptical measurements. It has been shown that Cs/sub 2/HgBr/sub 4/ and Cs/sub 2/CdBr/sub 4/ crystals are good acoustooptical materials. The photoelastic coefficients of Cs/sub 2/HgBr/sub 4/ and Cs/sub 2/CdBr/sub 4/ crystals achieve values p/sub 44/ = 0.12 and p/sub 44/ = 0.2 respectively as well as acoustooptical figures of merit- M/sub 2/ = 126.5 /spl times/ 10/sup -15/ s/sup 3//kg for Cs/sub 2/HgBr/sub 4/ crystals and M/sub 2/ = 366.9 /spl times/ 10/sup -15/ s/sup 3//kg for Cs/sub 2/CdBr/sub 4/ crystals. Acoustooptical diffraction has been observed and studied experimentally in Cs/sub 2/HgCl/sub 4/, Cs/sub 2/HgBr/sub 4/ and Cs/sub 2/CdBr/sub 4/ crystals. From the studied range of transparency (/spl sim/0.32 /spl mu/m-20 /spl mu/m) follows that all three crystals can be used as effective acoustooptical materials in the wide spectrum range.