周期极化铌酸锂波长转换器脉冲抽运时的波形畸变  

Waveform Distortion in Periodically Poled Lithium Niobate-Based Wavelength Converter with Pulse Pumping

作　　者：罗传红[1] 孙军强[1] 王健[1] 陈金林[1] 

机构地区：[1]华中科技大学光电系

出　　处：《光学学报》2007年第6期1084-1089,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60577006)资助课题

摘　　要：理论分析了周期性结构的LiNbO3晶体(PPLN)光波导在脉冲光抽运时的级联二阶非线性效应,并通过数值计算得到了抽运、倍频、信号及转换四个光脉冲的波形在波导中的演化。研究表明,使用脉冲光抽运时,由于抽运光脉冲与倍频光脉冲之间的群速度失配导致的走离,将使倍频光脉冲产生展宽;再通过差频转换使得转换光脉冲产生了波形畸变和峰值偏移。最后通过实验验证了转换光脉冲的波形畸变。Theoretical research on the cascaded second-order nonlinearity based on periodically poled lithium niobate waveguide in pulsed pumping is presented. By numerical simulations the propagation figure is obtained and it exhibits the waveform evolution of pump, second harmonic, signal and difference frequency pulse. The analyses demonstrate that harmonic pulse is continually broadened along propagation length because the walk-off occurs among four pluses due to group-velocity-mismatch, and then converted-pulse-waveform distorts with peak offset. The wavelength conversion experiment has been completed in pulsed pumping and converted-pulse-waveform distortion has been demonstrated.

关 键 词：非线性光学 倍频效应 差频效应 走离效应 脉冲抽运 脉冲展宽 波形畸变 

分 类 号：O437[机械工程—光学工程] TN252[理学—光学]