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基于周期性极化铌酸锂晶体(PPLN)的准相位匹配光参变放大过程,通过倾斜周期极化铌酸锂晶体中极化域(极化光栅)一定角度,实现了介于共线匹配方式和非共线匹配方式之间的一种半非共线型准相位匹配方式,并以该匹配方式下的各光矢量几何关系得出相位匹配曲线,找到在特定抽运光和信号光波长下能获得宽带增益放大的周期极化长度。并研究其极化倾斜角度与温度特性。模拟计算表明,在合适的角度与温度条件下,该方式可以532 nm抽运光抽运的信号光在800 nm和1064 nm处均获得宽带光参变放大。
Based on the quasi-phase-matching optical parametric amplification of periodically poled lithium niobate crystals (PPLN), the polarization-domain polarization grating (Polarization grating) is tilted at a certain angle by tilting the periodic polarization, Non-collinear matching between a semi-non-collinear quasi-phase matching mode, and the light vector of the matching mode geometry to find the phase matching curve to find the specific pump light and signal light wavelength Under the broadband gain gain of the periodic polarization length. And study its polarization tilt angle and temperature characteristics. The simulation results show that this method can obtain wideband optical parametric amplification at 800 nm and 1064 nm with 532 nm pump signal light pumping at the proper angle and temperature.