激光与光电子学进展, 2011, 48 (2): 020601, 网络出版: 2011-01-12
一种适合低阈值中红外超连续谱产生的新型微结构光纤
Microstructed Fiber for Low-Threshold Mid-IR Supercontinuum Generation
光纤光学 中红外超连续谱 微结构光纤 光纤设计 硫化物玻璃 fiber optics mid-IR supercontinuum microstructured optical fiber fiber design chalcogenide glass
摘要
提出并设计了一种适合低阈值中红外超连续谱产生的新型微结构光纤。采用多极法对光纤的传输常数和模场分布进行计算。计算结果表明,光纤在中红外波段具有极高的非线性系数、平坦的色散曲线、极低的模式限制损耗以及良好的单模传输特性,在2.2 μm和3.32 μm处分别有一个零色散点。采用分步傅里叶的数值模拟方法,研究了光纤中超连续谱的产生。通过合理调节抽运脉冲的波长、脉宽和峰值功率,发现在2.5 μm处抽运脉宽为100 fs,峰值功率为100 W的脉冲,通过0.1 m长的光纤后,能产生1.5~5.5 μm波段的中红外超连续谱,而单个抽运脉冲能量只有10 pJ。孤子自频移和色散波放大是光纤中超连续谱产生的主要原因。
Abstract
A new microstructured fiber for low-threshold mid-infrared (mid-IR) supercontinuum generation is proposed and designed. The transmission parameters and mode field intensity are calculated by multipole method. The results show the fiber has high nonlinear coefficient, widely flattened chromatic dispersion, low confinement loss together with a single mode operation in the mid-IR range. It has two zero-dispersion wavelengths(ZDWs) at 2.2 μm and 3.32 μm. The supercontinuum generation in fiber is studied by a split-step Fourier numerical stimulation method. We find the pulse with pump pulse width of 100 fs and peak power of 100 W, can generate the mid-IR supercontinuum spectrum covering 1.5~5.5 μm, bu the energy of pump single pulse is only 10 pJ. Soliton self-frequency shift and dispersion wave amplification are the major reasons for supercontinuum generation in fiber.
谢栋, 文建国, 赵楚军, 夏兰叶. 一种适合低阈值中红外超连续谱产生的新型微结构光纤[J]. 激光与光电子学进展, 2011, 48(2): 020601. Xie Dong, Wen Jianguo, Zhao Chujun, Xia Lanye. Microstructed Fiber for Low-Threshold Mid-IR Supercontinuum Generation[J]. Laser & Optoelectronics Progress, 2011, 48(2): 020601.