论文部分内容阅读
高功率激光系统中一般利用相位调制器对单纵模激光进行频谱展宽以避免受激布里渊散射,当后继系统中的滤波器存在中心波长偏差时,则会导致相位调制产生的边带失衡,使光信号出现较为严重的高频起伏。基于前端系统模拟平台对此问题进行了数值模拟研究,结果表明滤波后的高频起伏随滤波器带宽变窄和中心波长偏差增大而加剧。分析表明0.2 nm带宽的滤波器出现0.05 nm左右的波长偏差时,将引起24.3%左右的顶部起伏。实验中根据分析将滤波器带宽从0.2 nm加大到0.4 nm,成功将脉冲顶部起伏从25.2%减小到了4.4%,对前端系统的研制起到了很好的指导作用。
In high-power laser systems, the phase modulator is usually used to broaden the spectrum of the single longitudinal mode laser to avoid stimulated Brillouin scattering. When the filter in the succeeding system has a center wavelength deviation, the sideband generated by the phase modulation will be unbalanced , So that the optical signal appears more serious high-frequency fluctuations. Based on the front-end system simulation platform, the numerical simulation of this problem is carried out. The results show that the filtered high-frequency fluctuation aggravates with the narrowing of the filter bandwidth and the increase of the center wavelength deviation. Analysis shows that 0.2 nm bandwidth filter wavelength deviation of about 0.05 nm, will cause about 24.3% of the top of the ups and downs. In the experiment, the bandwidth of the filter was increased from 0.2 nm to 0.4 nm according to the analysis, and the pulse top fluctuation was successfully reduced from 25.2% to 4.4%, which played a good guiding role in the development of the front-end system.