中国激光, 2017, 44 (7): 0703023, 网络出版: 2017-07-05
抽运波长对中红外超连续谱影响的数值模拟
Numerical Simulation of Effect of Pump Wavelength on Mid-Infrared Supercontinuum
超快光学 中红外超连续谱 光子晶体光纤 抽运波长 非线性效应 ultrafast optics mid-infrared supercontinuum photonic crystal fiber pump wavelength nonlinear effect
摘要
采用数值模拟研究了飞秒脉冲在悬吊芯As2S3微结构光纤中传输时, 抽运波长对中红外超连续谱产生的影响。通过分步傅里叶算法数值求解广义非线性薛定谔方程, 对不同抽运波长的飞秒脉冲在悬吊芯As2S3微结构光纤中传输时的传输特性及演化过程进行分析。模拟结果表明, 当抽运波长为2300 nm时, 处于光纤的反常色散区且近零色散波长, 可获得宽带且平坦的中红外超连续谱, 光谱范围覆盖1.2~7 μm; 当抽运波长为2500 nm时, 处于光纤的反常色散区且远离零色散波长, 可获得超宽带中红外超连续谱, 光谱范围覆盖1.2~7.5 μm, 但其平坦度略差。该结果对产生中红外超连续谱时选择合适的激光抽运波长, 进而优化中红外超连续谱具有重要的参考价值。
Abstract
Numerical simulation is used to study the effect of pump wavelength on mid-infrared supercontinuum generation when femtosecond pulse is transmitted in As2S3 suspended-core microstructure optical fiber. The transmission characteristics and evolution process of femtosecond pulse with different pump wavelengths in As2S3 suspended-core microstructure optical fiber are analyzed by using split-step Fourier method to solve the generalized nonlinear Schrdinger equation numerically. The analytical results demonstrate that the flatter and wider mid-infrared supercontinuum of 1-7 μm can be obtained when the pump wavelength is 2300 nm, locating in anomalous dispersion region and closing to zero dispersion wavelength. And the wider mid-infrared supercontinuum of 1-7.5 μm can be obtained when the pump wavelength is 2500 nm, locating in anomalous dispersion region and keeping away from zero dispersion wavelength. But the flatness of mid-infrared supercontinuum with 2500 nm is slightly worse. This study has a significant reference value for selecting pump wavelength and optimizing mid-infrared supercontinuum.
高鹏飞, 李晓辉, 罗文峰, 邹德峰, 柴通, 庞星星. 抽运波长对中红外超连续谱影响的数值模拟[J]. 中国激光, 2017, 44(7): 0703023. Gao Pengfei, Li Xiaohui, Luo Wenfeng, Zou Defeng, Chai Tong, Pang Xingxing. Numerical Simulation of Effect of Pump Wavelength on Mid-Infrared Supercontinuum[J]. Chinese Journal of Lasers, 2017, 44(7): 0703023.