基于倍频波长转换中走离效应产生多个脉冲的研究  

Research on Technique of Multi-pulses Produced by Walk-off effect in Second-harmonic-generation Process

作　　者：罗传红[1] 孙军强[1] 王健[1] 朱援祥[2] 郭嘉琳[2] 

机构地区：[1]华中科技大学光电子科学与工程学院,武汉430074 [2]武汉大学动力与机械学院,武汉430072

出　　处：《光子学报》2008年第7期1321-1324,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(60577006)资助

摘　　要：利用倍频光与泵浦光脉冲之间的走离效应,通过在周期性极化的LiNbO3波导中间增加两段未被极化的波导,1.55μm波段的泵浦脉冲在极化的波导部分产生0.77μm波段的倍频光,在未被极化的部分不产生倍频光,形成了三个被间隔开来的倍频子脉冲.通过差频将三个倍频子脉冲还原成1.55μm波段的三个差频脉冲,实现了用一个泵浦脉冲产生三个转换脉冲.用数值模拟计算展示脉冲的产生及其演化过程,并讨论了用LiNbO3波导参量控制脉冲特征参量的方法.Using the walk-off effect between pump pulse and harmonic pulse, triple-pulses is produced by second-harmonic generation in periodically-poled lithium-niobate-waveguide in which two pieces of nonpoled waveguide is inserted. Three 0.77 μm-band harmonic pulses are generated by 1.55 μm-band pumppulse in poled segments, but they are separated in non-poled segments, Then three harmonic pulses are converted to three 1.55 μm-band converted pulses by difference-frequency generation. The configuration of triple-pulses produced by one pump pulse is implemented, the generation and the waveform-evolution of triple-pulses is exhibited by numerical simulations, and the method of controlling pulse＇ s characteristic parameter with waveguide size is analyzed as well.

关 键 词：波长转换 倍频效应 差频效应 脉冲走离 

分 类 号：O437[机械工程—光学工程] TN252[理学—光学]