基于内置电光晶体的F-P标准具，利用F-P多光束干涉原理和晶体的线性电光效应，提出了一种能有效提高啁啾脉冲信噪比的扫描滤波方法。给出了电光晶体加载电压的时变函数表达式，分析了影响信噪比提升效果的主要因素，并重点讨论了电光晶体的电压控制参数对信噪比提升效果和滤波器透过率的影响。研究结果表明，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。

A method of scanning filtering for improving the signal-to-noise ratio (SNR) of chirped pulse has been proposed. The method is based on Fabry-Perot (F-P) etalon with electro-optic crystal, and uses the principle of multi-beam interference of the F-P etalon and the linear electro-optic effect of the crystal. The time-varying function of the voltage applied on electro-optic crystal was given, and the main factors affecting the SNR were analyzed. Moreover, the effects of the control parameters of the applied voltage on the SNR and the transmittance of the filter were discussed. The results show that the SNR of chirped pulse laser can be improved nearly two orders of magnitude by using the scanning filtering method.