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基于扫描滤波原理,提出了一种新的用以提升啁啾脉冲激光信噪比(signal-to-noise,SNR)的光学扫描滤波方法.针对内置电光晶体的Fabry-Perot标准具的扫描滤波方案,定量分析了其扫描滤波谱特性,详细讨论了Fabry-Perot标准具平行平板的镜面反射率和内置电光晶体类型对输出脉冲信噪比的影响,并进一步探讨了控制电压变化对信噪比提升效果的影响.结果表明,扫描滤波器的透射窗口带宽越窄,信噪比的提升效果越好;为了保证输出效果,Fabry-Perot标准具平行平板反射率应大于0.9;对于内置二次电光晶体钽铌酸钾晶体的Fabry-Perot标准具扫描滤波方案,其外加电压较内置普通线性电光晶体的方案更低,且更易于控制;钽铌酸钾晶体构成组分的不同对滤波器效果的影响并不大,而控制电压和信号光啁啾率的变化则会对滤波效果产生较大影响.
Based on the principle of scanning filtering, a new optical scanning filtering method is proposed to improve the signal-to-noise (SNR) of the chirped pulse laser.The scanning filtering scheme of the Fabry-Perot etalon with built-in electro-optic crystal , Quantitatively analyzed the characteristics of the scan filter spectrum, and discussed in detail the influence of the specular reflectivity of the Fabry-Perot etalon parallel plate and the type of built-in electro-optic crystal on the signal-to-noise ratio of the output pulse, and further discussed the influence of the control voltage variation on the signal- The results show that the narrower the transmission window of scanning filter is, the better the signal to noise ratio is. In order to ensure the output effect, the parallel plate reflectance of Fabry-Perot etalon should be greater than 0.9. For the built-in secondary electro-optic crystal The Fabry-Perot etalon scan filter scheme of tantalum-niobate crystals has a lower applied voltage than the built-in normal linear electro-optic crystal and is easier to control; the effect of different components of the tantalum potassium niobate crystal on the filter effect Not large, and the control voltage and signal light chirp rate changes will have a greater impact on the filtering effect.