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从理论上推导了第Ⅱ类相位匹配下宽带飞秒脉冲的二次谐波光场,分析输入飞秒脉冲的非共线相位匹配方式、脉冲带宽引起相位失配与群速失配对测量的影响。结果表明,为了消除飞秒脉冲的带宽影响,需要对测量记录的光强乘以一个调制因子;测量相位误差与非共线相位匹配的夹角和晶体长度成正比;相位失配与群速失配产生相位测量误差,且第Ⅱ类相位匹配方式下脉冲附加相位值较大;强度和相位误差需要在脉冲重建结果中补偿。
The second harmonic field of broadband femtosecond pulse under phase Ⅱ phase matching is deduced theoretically. The non-collinear phase matching mode of input femtosecond pulse is analyzed. The influence of phase mismatch and group velocity mismatch on the measurement . The results show that in order to eliminate the influence of the bandwidth of femtosecond pulse, it is necessary to multiply the measured light intensity by a modulation factor; the angle between measurement phase error and non-collinear phase matching is proportional to crystal length; phase mismatch and group velocity loss With phase measurement error, and Phase II phase matching mode pulse additional phase value larger; intensity and phase error needs to be compensated in the pulse reconstruction results.