ZnGeP_2-差频中红外激光器的角调谐特性及转换效率  

Tuning Properties and Conversion Efficiency in Mid-Infrared Laser Using ZnGeP_2-Difference Frequency Generation

作　　者：李光[1] 王丽[1] 

机构地区：[1]北京工业大学应用数理学院,北京100124

出　　处：《中国激光》2010年第1期54-58,共5页Chinese Journal of Lasers

基　　金：全国高等学校博士点基金(200800050013)资助项目

摘　　要：根据非线性晶体ZnGeP2（ZGP）的色散方程、能量和动量守恒,对ZGP-DFG过程的调谐特性、转换效率以及此过程中的允许参量、走离效应进行了数值计算和分析,得到了Ⅰ类和Ⅱ类相位匹配条件下的ZGP-DFG角度调谐特性和转换效率。在Ⅰ类和Ⅱ类相位匹配条件下,分别对ZGP,AgGaS2（AGS）和AgGaSe2（AGSe）晶体的调谐特性进行了比较,得到了在Ⅰ类匹配时,ZGP的角度调谐范围为51°-89°,对应的波长范围在3.1-12μm;在Ⅱ类匹配时,波长调谐范围6.2-11.5μm,对应的角度调谐范围为58°-88°。结果表明ZGP-DFG的走离效应较小且转换效率远大于AGS和AGSe晶体。进一步证明了ZGP为较好的中红外激光晶体。According to the Sellmeier dispersion equation and law of energy conservation and momentum conservation,the tuning characteristics,conversion efficiency,permitted parametric and walk-off effect of ZGP-DFG have been obtained using numerical simulation in type-Ⅰ and type-Ⅱ phase-matched.The ranges of angle tuning were 51°～89° in type-Ⅰ,and 58°～88° in type-Ⅱ.The corresponding ranges of wavelength were 3.1～12 μm and 6.2～11.5 μm,respectively.In addition,the corresponding characteristics of AgGaS2（AGS） and AgGaSe2（AGSe） were compared with ZGP,and the conclusion was the walk-off effect of ZGP-DFG was small,and the conversion efficiency of ZGP-DFG was the highest among the three crystals.In summary,ZGP was a better crystal to produce the mid-infrared laser.

关 键 词：非线性光学 中红外辐射 角度调谐 ZGP晶体 差频产生 

分 类 号：O437[机械工程—光学工程]