MgO∶LiNbO_3晶体中超短中红外非共线相位匹配光参量放大过程角度的优化选择

Angle Optimization for Ultra-Short Mid-Infrared Non-Collinear Phase Matching Optical Parametric Amplificauion in MgO∶LiNbO_3 Crystal

计算了MgO：LiNbO3中超短中红外光参量放大（OPA）过程中晶体的相位匹配角与非共线角的优化选择。结果表明，对于800 nm波长的抽运光，信号光波长为1053 nm时，非共线角α优化在1．74°～2°之间；当信号光波长在1046-1067nmnm变化时，α在1．05°～2．18°之间，并且当信号光波长为1057nm，α=1．76°时，可实现三波间群速度的完全匹配。同时还得到了抽运光中心波长在780-810nm之间变化时，实现完全群速度匹配时的注入信号光波长与对应的中红外光以及相应的非共线角与相位匹配角。

The phase matching angle and the non-collinear angle for ultrashort and mid-infrared optical parametric amplification （OPA） in MgO： LiNbO3 are calculated. With pump light wavelength fixed at 800 nm, the noncollinear angle should be optimized between 1.74° and 2° when the seeded signal wavelength is 1053 nm, and the non -collinear angle should be optimized between 1.05° and 2.18° when the seed signal wavelength changes between 1046 and 1067 nm. Especially, when the seeded signal wavelength is 1057 nm and the non-collinear angle is 1.76°, the group velocities mismatching can be almost completely compensated with the pump light wavelength fixed at 800 nm. The series of signal light wavelength, mid-infrared light phase matching angle and non-collinear angle are also achieved when the group velocities are almost completely compensated with the pump light changing between 780 and 810 nm.