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：杨未强[1] 侯静[1] 张斌[1] 王彦斌[1] 刘泽金[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《强激光与粒子束》2012年第9期2031-2036,共6页High Power Laser and Particle Beams

基　　金：教育部新世纪优秀人才计划项目(NCET-08-0142);国家自然科学基金项目(61077076;61007037)

摘　　要：对2μm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COM-SOL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1.96μm、峰值功率为20kW的50fs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6cm时,产生的中红外超连续谱波长范围为1.0～4.5μm。The mid-infrared supercontinuum generation in telluride photonic crystal fiber with 2 ＆mu;m 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 ＆mu;m central wavelength and 20 kW peak power, a mid-infrared supercontinuum with a bandwidth from 1 ＆mu;m to 4.5 ＆mu;m is obtained when the fiber length is 6 cm.

关 键 词：光纤光学 中红外超连续谱 分步傅里叶法 碲化物 光子晶体光纤 

分 类 号：O437[机械工程—光学工程] TN212[理学—光学]