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提出了利用倍频效应得到双波长抽运三零色散光子晶体光纤(PCF),产生近红外、中红外波段超连续谱。设计三零色散光子晶体光纤结构,采用分步傅里叶算法数值求解非线性薛定谔方程,模拟双波长抽运三零色散光子晶体光纤产生超连续谱的演化过程,分析了不同光纤长度和脉冲峰值功率对产生的超连续谱的影响。结果表明:当抽运激光脉冲中心波长分别为1μm和2μm、脉宽为100 fs、重复频率为200 k Hz,传输距离为10 cm、脉冲峰值功率为10 k W时,得到了谱宽为690~3150 nm的超连续谱,包含了近红外、中红外波段,光谱具有较好的连续性和平坦度。
The double wavelength pumping triplet dispersion photonic crystal fiber (PCF) is proposed by using the frequency doubling effect to generate near-infrared and mid-infrared supercontinuum. The structure of the three-zero dispersion photonic crystal fiber was designed. The nonlinear Schrodinger equation was solved by using the fractional Fourier algorithm. The evolution of the supercontinuum was simulated by using the three-wavelength dispersive photonic crystal fiber. The effects of different fiber length and pulse peak The effect of power on the resulting supercontinuum. The results show that when the center wavelength of pumping laser pulse is 1μm and 2μm, the pulse width is 100 fs, the repetition frequency is 200 k Hz, the transmission distance is 10 cm and the pulse peak power is 10 k W, the spectral width is 690 ~ 3150 nm supercontinuum, including the near-infrared and mid-infrared bands, the spectrum has good continuity and flatness.