四波混频过程中差频与和频的竞争研究  

The Competition between Two-Photon Resonance Four Wave Frequency Difference and Sum Mixings

作　　者：李奇峰[1] 汪华[1] 石勇[1] 戴静华[1] 刘世林[1] 俞书勤[1] 马兴孝[1] 

机构地区：[1]中国科学院选键化学重点实验室,中国科学技术大学化学物理系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2005年第3期298-302,共5页化学物理学报（英文）

基　　金：ProjectsupportedbytheStateKeyDevelopmentProgramforBasicResearchofChina(G1999075304)andtheNationalNaturalScienceFoundationofChina(20373066).

摘　　要：在以惰性气体Xe为非线形介质,利用双光子共振四波混频差频(2PR4WDM,ω-=2ωUV-ωT)技术,产生可调谐相干真空紫外激光(VUV)的实验中,观察到产生的VUV在一些特定波长附近出现共振衰减.这些波长对应着伴随过程四波混频和频的双共振增强.对四波混频过程进行了比较粗略的定量的处理,考虑到泵浦光在传播途中的衰减,得到的结论能很好地解释观察到的差频输出的衰减现象,差频输出的衰减是由于双共振四波混频和频(ω+=2ωUV+ωT)与差频竞争的结果.Tunable intense Vacuum-Ultraviolet ( VUV) laser was generated by two-photon resonant four wave difference frequency mixing (omega(-) = 2 omega(uv) - omega(T)) in Xenon. In the experiment - some resonance attenuations of the VUV were observed at certain difference frequencies. These attenuations occur when the sum frequencies omega(+) = 2 omega(uv) + omega(T) coincide with excited ns (n = 10,11) and nd (n = 8 similar to 13) states. The third order linear susceptibility chi((3)) (2 omega(UV) + omega(T);omega(UV) , omega(UV) + omega(T)) is reasonably increased by the double resonance enhancement, so the conversion efficiency of sum frequency mixing can be very high and the power of the pump laser is decreased and thus the difference frequency output is attenuated.

关 键 词：四波混频 VUV强度凹陷 差频与和频的竞争 

分 类 号：TN24[电子电信—物理电子学]