研究了纳秒脉冲在光子晶体光纤中的演化和传输.利用纳秒激光器产生脉宽为65ns、重复频率为150kHz光脉冲,泵浦25m的光子晶体光纤,获得了输出功率为0.76W、整个光谱范围超过1200nm的超连续谱.在光谱展宽的初始阶段,光谱的展宽来源于调制不稳定性效应.随着泵浦功率的增加,发现四波混频效应对光谱短波部分的展宽起作用,受激拉曼散射效应对光谱长波部分的展宽起作用. The evolution and transmission of nanosecond pulses in photonic crystal fiber were studied.The nanosecond laser was used to generate a photon crystal fiber with a pulse width of 65ns and a repetition frequency of 150kHz and a photon crystal fiber of 25m was pumped.The output power was 0.76W.The whole spectrum In the initial stage of spectrum broadening, the broadening of the spectrum comes from the modulation instability effect.With the increase of pump power, it is found that the four-wave mixing effect has an effect on the broadening of the shortwave part of the spectrum, The stimulated Raman scattering effect plays a role in the broadening of the long wavelength part of the spectrum.