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建立了描述内腔连续波单共振光学参量振荡器(ICCWSRO)的功率特性的高斯光束理论。将激光谐振腔内的二阶非线性相互作用视为激光器的一种输出损耗,求解描述激光器功率特性的方程,得到激光器的非线性反射率,进而得到内腔连续波单共振光学参量振荡器的信号波和闲置波的功率特性。分析中考虑了驻波腔结构、四能级激光增益介质的端面抽运特性、二阶非线性作用的平均场近似、相互作用的各光波的衍射效应。若不考虑激光增益介质中光束的衍射效应并同时采用一级近似,可以直接求解超越方程,得到激光器的非线性反射率。以Nd∶YVO4作为激光增益介质,周期极化LiNbO3(PPLN)作为二阶非线性晶体,给出了有关数值计算结果。
A Gaussian beam theory describing the power characteristics of a continuous resonator single resonator optical parametric oscillator (ICCWSRO) was established. Considering the second-order nonlinear interaction in the laser resonator as an output loss of the laser, the equation describing the power characteristics of the laser is solved to obtain the nonlinear reflectivity of the laser, and then the LCO single-resonant optical parametric oscillator Power characteristics of signal and idle waves. In the analysis, the pump cavity structure, the end-face pumping characteristics of the four-level laser gain medium, the mean field approximation of the second-order nonlinear effects and the diffraction effects of the light waves interacting are considered. Without considering the diffraction effect of the laser beam in the laser gain medium and using the first-order approximation, the transcendental equation can be solved directly to obtain the nonlinear reflectivity of the laser. Using Nd: YVO4 as the laser gain medium, the periodically polarized LiNbO3 (PPLN) is taken as the second-order nonlinear crystal, and the numerical results are given.