Andreana M, Labruyère A, Tonello A, Wabnitz S, Leproux P, Couderc V, Duterte C, Cserteg A, Bertrand A, Hernandez Y, Giannone D, Hilaire S, Huss G
Université de Limoges, XLIM, UMR CNRS 7252, Limoges, France.
Opt Express. 2012 May 7;20(10):10750-60. doi: 10.1364/OE.20.010750.
We experimentally and numerically investigated the impact of input pump pulse duration on the near-infrared bandwidth of supercontinuum generation in a photonic crystal fiber. We continuously stretched the temporal duration of the input pump laser (centered at 1030 nm) pulses from 500 fs up to 10 ps, while keeping fixed the pump peak power. We observed that the long-wavelength edge of the supercontinuum spectrum is increased by 200 nm as the pump pulse duration grows from 500 fs to 10 ps. We provide a quantitative fit of the experimental results by means of numerical simulations. Moreover, we have explained the observed spectral broadening enhancement induced by pump pulse energy by developing an approximate yet fully analytical model for soliton energy exchange through a series of collisions in the presence of stimulated Raman scattering.
我们通过实验和数值方法研究了输入泵浦脉冲持续时间对光子晶体光纤中超连续谱产生的近红外带宽的影响。我们将输入泵浦激光（中心波长为1030 nm）脉冲的时间持续时间从500 fs连续拉伸至10 ps，同时保持泵浦峰值功率不变。我们观察到，随着泵浦脉冲持续时间从500 fs增加到10 ps，超连续谱的长波长边缘增加了200 nm。我们通过数值模拟对实验结果进行了定量拟合。此外，我们通过建立一个近似但完全解析的模型来解释泵浦脉冲能量引起的光谱展宽增强，该模型用于描述在受激拉曼散射存在的情况下，孤子通过一系列碰撞进行能量交换的过程。
