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采用分步傅里叶法对飞秒激光在BBO晶体中倍频过程的效率进行了数值计算 ,分析表明这种方法既避免了其他数学方法的繁琐 ,又直观地展现了倍频过程的物理本质 .针对有关实验条件 ,计算了脉宽为 10 0fs的激光脉冲通过 2mm长、Ⅰ类相位匹配的BBO晶体的倍频效率 ,计算结果与实验上对同样晶体倍频效率的测量是一致的 .
The efficiency of the frequency doubling process of the femtosecond laser in the BBO crystal was numerically calculated by using the fractional Fourier method. The analysis shows that this method not only avoids the cumbersomeness of other mathematical methods, but also intuitively shows the physical nature of the frequency doubling process According to the experimental conditions, the frequency doubling efficiency of a 2 mm long, class Ⅰ BBO crystal with a pulse width of 10 fs is calculated, which is consistent with the experimental measurement of the same crystal frequency doubling efficiency.