The basic principle of quasi-phase-matching (QPM) of DFG is depicted, the temperature tuning characteristics of periodically poled LiNbO3(PPLN) are studied based on the Sellmeier equation for the extraordinary refraction index.

• 研究了基于准相位匹配技术的差频产生基本原理和PPLN晶体的温度调谐特性;