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用实验和数值模拟两种方法研究了在反常色散区抽运光子晶体光纤(PCF)中飞秒激光脉冲的传输特性和超连续谱的产生机理,给出了抽运脉冲在不同功率情况下输出光谱展宽并形成超连续谱的实际测量及理论模拟结果。研究表明:在反常色散区抽运时,光谱展宽的初期以自相位调制为主,随后根据抽运功率的不同,孤子自频移、高阶光孤子的裂变和四波混频效应会逐渐增强,进而成为光谱展宽的主要原因;初始激光脉冲的峰值功率和脉冲初始啁啾对光子晶体光纤反常色散区产生超连续谱形状和带宽是有影响的。
The propagation characteristics of femtosecond laser pulses and the generation mechanism of the supercontinuum in the photonic crystal fiber (PCF) with anomalous dispersion are studied experimentally and numerically. The results show that the pump pulses are output at different power levels Spectral broadening and the formation of supercontinuum spectrum measurements and theoretical simulation results. The results show that when the anomalous dispersion region is pumped, the initial phase of the spectrum broadening is self-phase modulated, and then the self-frequency shift of the soliton, the fission of the high-order optical soliton and the four-wave mixing effect will gradually increase according to the pumping power, and then the effect of the four- Which is the main cause of spectral broadening. The peak power of the initial laser pulse and the initial chirp of the pulse have an effect on the supercontinuum shape and bandwidth of the PCF.