强激光与粒子束, 2012, 24 (9): 2031, 网络出版: 2012-09-12   

激光泵浦碲化物产生中红外超连续谱数值模拟

Numerical simulation of mid-infrared supercontinuum generation in telluride with pulsed laser pumping
作者单位
国防科学技术大学 光电科学与工程学院, 长沙 410073
摘要
对2 μm波段脉冲激光泵浦碲化物光子晶体光纤产生中红外超连续谱进行了数值研究。通过材料的拉曼增益谱间接求得了对应的拉曼响应函数;由光子晶体光纤的材料折射率和波导结构,通过COMSOL软件获得了碲化物光子晶体光纤中基模等效折射率,计算了相应的色散曲线和限制损耗;利用自适应的分步傅里叶算法,模拟了中心波长为1.96 μm、峰值功率为20 kW的50 fs脉冲光泵浦碲化物光子晶体光纤时超连续谱的产生,当光纤长度为6 cm时,产生的中红外超连续谱波长范围为1.0~4.5 μm。
Abstract
The mid-infrared supercontinuum generation in telluride photonic crystal fiber with 2 μm wavelength region pulsed laser pumping is numerically investigated. The material Raman response function is indirectly obtained from the Raman gain spectrum. The effective refractive index of the fundamental mode in telluride photonic crystal fiber is obtained using the material refractive index and waveguide structure through COMSOL software. Then the calculated dispersion and confinement loss of telluride photonic crystal fiber are plotted using the effective refractive index of the fundamental mode. The supercontinuum generation process in telluride photonic crystal fiber is studied by the adaptive split-step Fourier method. Assuming a 50 fs pulsed laser launched into telluride photonic crystal fiber with 1.96 μm central wavelength and 20 kW peak power, a mid-infrared supercontinuum with a bandwidth from 1 μm to 4.5 μm is obtained when the fiber length is 6 cm.

杨未强, 侯静, 张斌, 王彦斌, 刘泽金. 激光泵浦碲化物产生中红外超连续谱数值模拟[J]. 强激光与粒子束, 2012, 24(9): 2031. Yang Weiqiang, Hou Jing, Zhang Bin, Wang Yanbin, Liu Zejin. Numerical simulation of mid-infrared supercontinuum generation in telluride with pulsed laser pumping[J]. High Power Laser and Particle Beams, 2012, 24(9): 2031.

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