Abstract
Innovative infrared nonlinear optical crystalsCsGe(BrxCl1−x)3 were synthesized. From their powder x-ray diffraction patterns,these crystals were characterized as rhombohedral structure with(R3m,No 160) space group symmetry. The energy gap decreased from about 3.43 to 2.38 eV as the substitutionalratio, x, changed from zero to unity. Moreover, the powder second-harmonic generation (PSHG) measurementof CsGeBr3 showed that its nonlinear optical efficiency is 9.64 times larger than that of rhombohedralCsGeCl3 and 28.29 times largerthan that of KH2PO4 (KDP), andmost important of all, that CsGe(BrxCl1−x)3 is phase matchable. So the optical nonlinearity is approximately inversely proportional tothe cube of the energy gap. The infrared transparent spectrum of rhombohedralCsGe(BrxCl1−x)3 was extendedto more than 30 µm, which shows the potential in the realm of nonlinear optics and can be applied to theinfrared region.
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