利用Mach-Zehnder干涉仪提升啁啾脉冲信噪比  

Improving signal-to-noise ratio of chirped laser pulse using Mach-Zehnder interferometer

作　　者：曾冰[1] 叶荣[1] 张彬[1] 孙年春[1] 隋展[2] 

机构地区：[1]四川大学电子信息学院,成都610064 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2013年第11期2788-2792,共5页High Power Laser and Particle Beams

基　　金：国家高技术研究发展计划项目

摘　　要：基于内置电光晶体的Mach-Zehnder干涉仪,利用Mach-Zehnder干涉仪双光束干涉原理和晶体的线性电光效应,提出了一种新的能有效提高啁啾脉冲信噪比的扫描滤波方法。定量分析了其扫描滤波谱特性,探讨了预脉冲噪声延时对信噪比提升效果的影响,并讨论了电光晶体的电压控制参数对信噪比提升效果的影响。研究结果表明:预脉冲噪声的延时和控制电压的变化会对滤波效果产生较大影响,利用该扫描滤波方法可将啁啾脉冲激光信噪比提升约2个量级,且信号光透过率高达95%以上。Based on Mach-Zehnder interferometer placed in electro-optic crystal,and using the principles of double beam interference of the Mach-Zehnder interferometer and the linear electro-optic effect of the crystal,a new method of scanning filtering for improving the signal to noise ratio （SNR） of chirped pulse was proposed.The spectral characteristics of the scanning filter were analyzed quantitatively.The effects of the delay time of the prepulse on the output SNR were analyzed.Moreover,the effects of the control parameters of the electro-optic crystal voltage on the SNR were discussed in detail.The results show that the variation of controlling voltage and the delay time of the prepulse have significant impact on the filtering effect and that the SNR of the chirp pulse can be improved nearly two magnitudes by using the scanning filtering method and the transmittance of signal can be as high as 95% or more.

关 键 词：啁啾脉冲 信噪比 MACH-ZEHNDER干涉仪 电光晶体 控制电压 扫描滤波 

分 类 号：O441.4[理学—电磁学]