基于马赫-曾德尔干涉仪的超短光脉冲合成系统

Ultrashort Optical Pulse Synthesis System Based on Mach-Zehnder Interferometer

基于传输矩阵法对马赫-曾德尔干涉仪的输出特性进行分析,结果表明,当干涉臂臂长差为中心波长与有效折射率比值的整数倍时,马赫-曾德尔干涉仪具有微分特性,且微分阶数与级联的干涉仪数目成正比。根据信号系统理论知识,利用马赫-曾德尔干涉仪的微分特性,设计出基于马赫-曾德尔干涉仪的超短光脉冲合成系统,并通过调节输入高斯脉冲及其各阶微分的加权系数,将输入的高斯脉冲分别合成为平顶脉冲、三角脉冲以及抛物线型脉冲。改变高斯脉冲各阶微分加权系数与输入脉冲宽度发现,输出脉冲波形基本保持不变,系统的稳定性良好。

Based on transfer matrix method,the output characteristics of Mach-Zehnder interferometer are analyzed.Results show that Mach-Zehnder interferometer has differential characteristics when difference of two interference arms′length is an integer multiple of the ratio of the center wavelength to the effective refractive index,and the differential order is proportional to the number of cascaded interferometers.Based on signal system theory and the differential characteristic of Mach-Zehnder interferometer,the ultrashort optical pulse synthesis system based on Mach-Zehnder interferometer is designed.By adjustment of the weighting coefficients of input Gaussian pulse and its differential order,input Gaussian pulses are synthesized into flattened pulse,triangular pulse and parabolic pulse,respectively.When the weighting coefficients and input width of Gaussian pulse are changed,the output pulse waveform is basically invariable,which proves the system has good stability.