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比较分析了MgO:LiNbO3(MLN)与KTiOAsO4(KTA)晶体中超短中红外光参量放大的角度调谐、有效非线性系数、群速度失配、晶体长度以及参量放大的转换效率等。结果表明,MgO:LiNbO3晶体的有效非线性系数较大,可用非共线相位匹配方式补偿三波群速度失配,在一定泵浦光强下有利于转换效率的提高。而KTA晶体的有效非线性系数较小,群速度失配严重且不能用非共线相位匹配方式补偿,达到饱和放大所需要的泵浦光功率密度高。在超短中红外光参量放大上,MgO:LiNbO3晶体具有较优的参量耦合性能。
The angle tuning, the effective nonlinear coefficient, the group velocity mismatch, the crystal length and the conversion efficiency of the parametric amplification were compared and analyzed for the optical parametric amplification of ultrashort mid-infrared in MgO: LiNbO3 (MLN) and KTiOAsO4 (KTA) crystals. The results show that the effective non-linear coefficient of MgO: LiNbO3 crystal is large, and the mismatch of phase-mismatch can be used to compensate the mismatch of three-wave group, which is beneficial to the improvement of conversion efficiency under a certain pump light intensity. However, the effective non-linearity coefficient of KTA crystal is small, the group velocity mismatch is serious and can not be compensated by the non-collinear phase matching method, and the power density of the pump light required for saturation amplification is high. The MgO: LiNbO3 crystal has better parametric coupling performance in ultrashort mid-infrared optical parametric amplification.