Abstract
An innovative infrared nonlinear optical crystal CsGe(Br x Cl 1− x ) 3 was synthesized. From its powder X-ray diffraction pattern, this crystal was characterized as a rhombohedral structure with a ( R3 m, No. 160) space group symmetry. The powder second-harmonic generation (PSHG) measurement of CsGeBr 3 showed that its nonlinear optical efficiency is 9.64 times larger than that of rhombohedral CsGeCl 3 and is 28.29 times larger than that of KH 2PO 4 (KDP), and most important of all, that CsGe(Br x Cl 1− x ) 3 is phase-matchable. The infrared transparent spectrum of rhombohedral CsGe(Br x Cl 1− x ) 3 was extended to more than 30 μm. The rhombohedral CsGe(Br x Cl 1− x ) 3 shows the potential in the realm of nonlinear optics and can be applied to the infrared region.
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