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通过非线性薛定谔方程模拟了不同激光脉冲形状在光子晶体光纤中传输时对超连续谱产生特性的影响。研究发现,高斯脉冲和双曲正割脉冲在光子晶体光纤中产生的超连续谱谱宽和形状与原脉冲基本相同;啁啾高斯脉冲和方形脉冲可以在很短的传输距离内得到很宽的光谱,但啁啾高斯脉冲相对于方形脉冲则较为平坦,方形脉冲则产生了很多新的频率成分。因此利用啁啾脉冲可以产生较宽的平坦超连续谱。
The nonlinear Schrodinger equation was used to simulate the effect of different laser pulse shapes on the properties of supercontinuum generation in photonic crystal fibers. The results show that the width and shape of the supercontinuum generated by the Gaussian pulse and the hyperbolic secant pulse in the photonic crystal fiber are basically the same as those of the original pulse. The chirped Gaussian pulse and the square pulse can be very broad within a short transmission distance However, the chirped Gaussian pulse is relatively flat with respect to the square pulse and the square pulse produces many new frequency components. Therefore, the use of chirped pulses can produce a wider flat supercontinuum.