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对基于多周期极化铌酸锂晶体 (PPLN)的信号光单谐振准相位匹配光学参量振荡器 (QPM OPO) ,进行了温度调谐的理论和实验研究。以激光二极管 (LD)端面抽运的声光调QNd∶YVO4全固态激光器为抽运源 ,获得了136 9 7～ 16 78 8nm无重叠波段连续可调谐输出。给出了 10 6 4nmNd∶YVO4激光器抽运下 ,由PPLN的极化周期和温度直接计算输出信号光波长的公式 ,以及由信号光波长和极化周期计算相应的晶体温度的公式。这样就可直接计算实现无重叠波段连续可调谐输出时不同极化周期所对应的温度调谐范围 ,而不必联立能量守恒和动量守恒公式 ,逐点进行尝试。另外 ,周期极化晶体的极化周期不可避免地较理想值有一定的偏移 ,且具有不均匀性 ,给出了利用实验获得的温度调谐曲线 ,对极化周期进行修正计算的方法
The theoretical and experimental studies on the temperature tuning of signal-to-noise single-phase quasi-phase-matching optical parametric oscillator (QPM OPO) based on multi-period polarized lithium niobate crystals (PPLN) The acousto-optic QNd: YVO4 all-solid-state laser pumped by the laser diode (LD) end face was used as the pump source, and the tunable output of 136 9 7 ~ 16 78 8nm without overlapping band was obtained. The formula for calculating the wavelength of the output signal directly from the polarization period and temperature of the PPLN and the corresponding crystal temperature from the signal wavelength and the polarization period are given under the pumping of the 1064nm Nd: YVO4 laser. In this way, the temperature tuning range corresponding to different polarization periods when the continuously tunable output of the non-overlapping wavelength band is achieved can be directly calculated without the need to jointly establish the conservation of energy and the momentum conservation formula, and attempt point by point. In addition, the polarization period of the periodically poled crystal inevitably has a certain deviation from the ideal value, and there is a nonuniformity. A method for correcting the polarization period by using the obtained temperature tuning curve is given