论文部分内容阅读
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。
The effect of pumping wavelength on the generation of mid-infrared supercontinuum was investigated by numerical simulation of the femtosecond pulse propagating in As 2 S 3 microstructured fiber. The generalized nonlinear Schrödinger equation was solved numerically by the step-by-step Fourier algorithm, and the transmission characteristics and evolution of femtosecond pulses at different pumping wavelengths in the As 2 S 3 microstructure fiber were analyzed. Simulation results show that when the pumping wavelength is 2300 nm, the broadband and flat near-infrared dispersion spectrum is obtained in the anomalous dispersion region of the fiber near zero dispersion wavelength. The spectral range covers 1.2-7 μm. When the pumping wavelength is 2500 nm , Which is in the anomalous dispersion region of the fiber and away from the zero-dispersion wavelength, the ultra-wideband mid-infrared supercontinuum can be obtained. The spectral range covers 1.2-7.5μm, but its flatness is slightly worse. The results have important reference value for choosing mid-infrared supercontinuum when choosing suitable laser pumping wavelength and optimizing mid-infrared supercontinuum.