同时考虑了群速色散失配、最低阶群速色散(GVD)和二阶群速色散。研究了在BBO晶体中飞秒激光脉冲的谐波产生,计算了BBO晶体的作为波长函数的晶体的最低阶和二谐群速色散,借助求解改进的耦合波方程的数值计算,得到了飞秒脉冲的二次及三次谐波辐射,分析了最低阶及二阶GVD对于基波脉冲和谐波脉冲的影响,最后考虑了三次谐波产生中群速失配的补偿。

Harmonic generation in BBO by femtosecond laser pulses is studied, taking into account both group velocity mismatch, lowest order group velocity dispersion (GVD) and second order GVD. The lowest and second order GVD of BBO as a function of wavelength is calculated. Second and third harmonic radiation with femtosecond laser pulses is computed by numerically solving the improved coupled wave equations. The effects of the lowest oder GVD and second order GVD on fundamental and harmonic pulses are analyzed. The compensation of group velocity mismatch for third harmonic generaiton is considered.