对基于周期极化掺氧化镁的铌酸锂(PPMgO:CLN)晶体的光参量放大器(OPA)进行了理论分析和实验研究。模拟了PPMgO:CLN晶体准相位匹配(QPM)波长-温度调谐曲线和OPA中各光波平均功率随晶体长度的变化曲线,并进一步分析了最佳晶体长度的影响因素。当常温极化周期为31.3μm的PPMgO:CLN晶体工作在150℃时,用平均功率为44W的调Q Nd:YAG激光器抽运OPA,注入OPA内的2.765μm激光的功率由4W定标放大至13.3W,转换效率为21.14%。 The theoretical analysis and experimental study on the optical parametric amplifier (OPA) based on periodically poled MgO doped lithium niobate (PPMgO: CLN) crystal were performed. The curve of QPM wavelength-temperature tuning curve and the average power of each light wave in OPA with crystal length was simulated, and the influencing factors of the optimal crystal length were further analyzed. When the normal temperature polarization period of PPMgO: CLN crystals is 31.3μm, the QA Nd: YAG laser with an average power of 44W is used to pump OPA. The power of 2.765μm laser injected into OPA is scaled up from 4W to 13.3W, conversion efficiency of 21.14%.