抽运波长对中红外超连续谱影响的数值模拟

发布时间：2017-12-28 01:26

本文关键词：抽运波长对中红外超连续谱影响的数值模拟　出处：《中国激光》2017年07期 　论文类型：期刊论文

【摘要】：采用数值模拟研究了飞秒脉冲在悬吊芯As_2S_3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As_2S_3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2300nm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1.2~7μm;当抽运波长为2500nm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1.2~7.5μm,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]:The influence of the pumping wavelength on the generation of the mid infrared supercontinuum is studied by numerical simulation in the transmission of the femtosecond pulse in the suspended core As_2S_3 microstructural fiber. The transmission characteristics and evolution process of femtosecond pulses with different pumping wavelengths in suspended core As_2S_3 microstructured optical fiber are analyzed by using the fractional Fourier algorithm to solve the generalized nonlinear Schrodinger equation numerically. The simulation results show that when the pump wavelength is 2300nm, in the anomalous dispersion region of fiber and near zero dispersion wavelength, mid IR supercontinuum can get broadband and flat, which covers the spectral range of 1.2~7 m; when the pump wavelength is 2500nm, in the anomalous dispersion region of fiber and far away from the zero dispersion wavelength can be. To obtain ultra broadband mid infrared supercontinuum spectrum, covering 1.2~7.5 m, but its flatness is slightly worse. The results have important reference value for selecting suitable laser pumping wavelength and optimizing the mid infrared supercontinuous spectrum in the production of mid infrared supercontinuum.
【作者单位】：陕西师范大学物理学与信息技术学院;西安邮电大学电子工程学院;
【基金】：国家自然科学基金(61605106) 陕西师范大学启动基金(1112010209,1110010717)
【分类号】：TN253
【正文快照】： 超短脉冲在高非线性光纤中传输时,因光孤子效应和多种非线性效应(如自相位调制、交叉相位调制、受激拉曼散射及四波混频等)的共同作用而使得输出光谱得到极大展宽,这种光谱即为超连续谱[1]。超连续谱由于具有较宽的光谱特性而得到了广泛的关注与研究,在可见光、近红外、中红外

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