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Study on Directional Processing of ZnGeP_2 Crystal Device

YANG Deng-hui;ZHAO Bei-jun;ZHU Shi-fu;CHEN Bao-jun;HE Zhi-yu;CAO Li-qiang;CHEN Cheng;Department of Materials Science,Sichuan University;  
A new directional processing method of optical device of ZnGeP 2 crystal grown by Vertical Bridgman-Stockbarger technique has been studied.The direction of c axis of the crystal could be found fast according to the method that combines cleavage faces((112) and(101)),standard pole figures and X-ray diffraction,and then the(001) face can be determined.The light pass surface was got by phase matching angle,azimuth and faces(101) and(102).A semi-finished device of ZnGeP 2 optical parametric oscillator(OPO) was got by cutting this surface.Final ZGP-OPO device with size of 11 mm ×11 mm ×22 mm was obtained by X-ray diffraction on the sample,and subsequent polishing and coating process.Tunable midinfrared laser in the range of 3-5 μm was realized on the ZGP-OPO pumped by 2.1 μm,7 kHz laser,and the output power reached 0.48 W.The method not only could be used on orientional processing of ZnGeP 2, but also could be applied on orientional processing of other crystals with the similar structure.
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