不同零色散点光子晶体光纤的超连续谱产生

The Influence of Zero-dispersion Point of Photonic Crystal Fiber on Supercontinuum Generation

本文实验研究了飞秒脉冲在不同零色散点光子晶体光纤中传输时产生超连续谱的现象。首先,我们通过非线性薛定谔方程理论计算了激光脉冲分别在正、负色散光子晶体光纤中传输时产生的超连续谱;计算结果表明在正色散光子晶体光纤产生的超连续谱远远大于在负色散中产生的超连续谱。其次,在实验上采用零色散点分别为800 nm、1 060 nm和2 000 nm的光子晶体光纤,将脉宽为130 fs,中心波长800 nm,脉冲重复频率为80 MHz的脉冲输入这些光纤中产生超连续谱并研究其特性,实验结果表明光子晶体光纤的零色散点越小,在其中产生的超连续谱越宽越平坦。同时产生的超连续谱也与激光脉冲的能量和中心波长相关。

The supercontinuum spectrums generated in photonic crystal fibers of normal and anomalous dispersions are calculated by nonlinear Schrodinger equation. The solution shows that the spectrum width of the supercontinuum generated in normal dispersion photonic crystal fiber is much larger than that in anomalous dispersion photonic crystal fiber. In experiment, the Supercontinuum spectrums are generated in different zero-dispersion photonic crystal fibers with 130 fs ultrafast laser pulses. The photonic crystal fibers of zero-dispersion point at 800 nm, 1 060 nm and 2 um are engaged. The Supercontinuum spectrums with different pulse energies and different central wavelengths are obtained and the difference between them are discussed.