Moon Sucbei, Kim Dug Y
Opt Express. 2006 Jan 9;14(1):270-8. doi: 10.1364/opex.14.000270.
We present a compact supercontinuum source using a dispersion-shifted fiber and an amplified diode-laser pulse source. Gain-switched DFB laser operating at 1550-nm wavelength, which provides 30-ps pulses, was used for generating the seeding pulses. And serially cascaded low-cost EDFAs were employed to boost the peak power of the pulses to more than 1 kW. Single-mode supercontinuum spanning nearly the full near-IR band was obtained by passing the amplified high-power pulses through a dispersion-shifted fiber. By investigating various characteristics of the supercontinuum generation, the walk-off between the spectral components was found to limit the effective interaction length of the spectrum-broadening effects. An optimal length of the fiber to obtain a flat spectrum was determined, which minimizes undesirable excessive Raman effect.
我们展示了一种使用色散位移光纤和放大二极管激光脉冲源的紧凑型超连续谱源。工作在1550纳米波长、提供30皮秒脉冲的增益开关分布反馈激光器被用于产生种子脉冲。并且采用串联的低成本掺铒光纤放大器将脉冲的峰值功率提升至超过1千瓦。通过让放大后的高功率脉冲通过色散位移光纤，获得了覆盖几乎整个近红外波段的单模超连续谱。通过研究超连续谱产生的各种特性，发现光谱成分之间的走离限制了光谱展宽效应的有效相互作用长度。确定了获得平坦光谱的光纤最佳长度，该长度可使不期望的过度拉曼效应最小化。
