中国激光, 2010, 37 (S1): 172, 网络出版: 2010-10-29
激光相干合成中的相位与偏振态变化特性
Transformation Characteristic of Phase and Polarization in Laser Coherent Combination
相干光学 高斯光束 光束合成 外差法 液晶相位调制器 coherent optics Gaussian beams beam combination heterodyne method liquid phase modulator
摘要
采用夫琅禾费衍射理论与数值模拟方法计算了光束间距、阵列占空比以及相位变化与相干合成远场光强分布之间的关系; 运用外差法和液晶相位调制器,验证了激光偏振态与相位变化对相干合成光强分布的影响, 并得到了光束在光纤中传输的相位变化特性。结果表明, 相位的随机变化使得合成光强降低, 并有本底漂移; 偏振态的改变会使合成光束的条纹对比度发生较大变化; 在振动、温度变化的环境中, 光束相位变化的频率明显高于自然环境下的频率。
Abstract
By Fraunhofer diffration theory and numerical analysis method, the relation of beam separation distance, fill factor, phase change and far-field intensity distribution of laser coherent combination is calculated. The influences of transformation characteristic of phase and polarization on intensity distribution of coherent combination are studied by heterodyne method and liquid phase modulator. The characteristics of phase change for beam in fiber transmission is obtained. As a result of the random change of phase, the intensity of laser combination is reduced and the excursion of background comes forth. The contrast of fringes can be changed with the transformation of polarization. In vibrant and temperature changed environment, the frequency for phase change in beam is higher than that in natural environment.
黄智蒙, 骆永全, 张大勇, 刘仓理. 激光相干合成中的相位与偏振态变化特性[J]. 中国激光, 2010, 37(S1): 172. Huang Zhimeng, Luo Yongquan, Zhang Dayong, Liu Cangli. Transformation Characteristic of Phase and Polarization in Laser Coherent Combination[J]. Chinese Journal of Lasers, 2010, 37(S1): 172.