磷锗锌光学参量振荡器技术研究

报道了一台高重复频率2 mm光学参量振荡器泵浦的磷锗锌光学参量振荡器。磷锗锌晶体(ZnGeP2，简称ZGP)采用Ⅰ类相位匹配方式，切割角度q为55°，f为0°，尺寸5.5 mm×6 mm×18 mm，在4.0 kHz重复频率下，当注入5.2 W的2 mm圆偏振光时，获得310 mW中红外输出，p偏振态2 mm到3～5 mm光-光转换效率12%。通过调节晶体的角度，实验获得ZGP光学参量振荡器的波长调谐曲线，在误差范围内与理论变化规律相符。

Zinc germanium phosphide optical parametric oscillator

This paper reported a ZGP (zinc germanium phosphide) optical parametric oscillator (OPO) pumped by high-repetition rate 2 mm OPO. Type Ⅰ ZGP crystal (ZnGeP2) with the size of 5.5 mm×6 mm×18 mm was cut at phase matching angles of 55° and 0°. Under 4.0 kHz repetition rate, 310 mW mid-IR laser was obtained when the random polarization 2 mm pumping power was 5.2 W. The optical-to-optical efficiency of the p-polarized 2 mm to 3~5 mm was 12%. The experimental wavelength tuning curve of ZGP OPO was also achieved by tuning the angle of the ZGP crystal. It accorded with the theoretical rule in the error range.