三零色散光子晶体光纤中超连续谱的产生与控制

Generation and Control of Supercontinuum in Photonic Crystal Fiber with Three-Zero Dispersion Wavelengths

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。

Supercontinuum generation by dual-wavelength pumping in photonic crystal fiber（PCF） with threezero dispersion wavelengths is proposed. The spectrum extended from near infrared to mid infrared. Evolutions of pulse are modeled based on the nonlinear Schrodinger equation by predictor-corrector split-step Flourier method when the pulse travels in a tellurite PCF. The impacts of the fiber length and pulse peak power on the spectrum are discussed respectively. The result reveals that a combined visible and infrared supercontinuum spectrum spanning from 690 nm to 3150 nm after 10 cm traveling distance when the fiber is pumped by two pulses centred at 1 mm and 2 mm simultaneously with pulse width of 100 fs, repetition frequency of 200 k Hz and peak pulse power of 10 k W. The spectrum has good continuity and flatness.