倾斜相差对激光相干合成影响的仿真分析  

Simulation analysis of influence of tilt phase error on coherent beam combination

作　　者：田俊林[1,2] 潘旭东[1,2] 贺喜[1,2] 

机构地区：[1]中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳621900 [2]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《强激光与粒子束》2014年第5期24-27,共4页High Power Laser and Particle Beams

摘　　要：根据夫琅和费衍射理论,建立了四路激光相干合成模型,研究了不同占空比条件下倾斜相差对激光相干合成效果的影响。通过欧拉旋转变换,将各子光束的倾斜角度转换成相应的倾斜相差引入到光束合成模型中。仿真计算了不同占空比、不同倾斜角度情况下合成光束在远场的光强分布,分析了占空比、倾斜角度对远场光强分布的影响。仿真结果表明,随着子光束倾斜角度的增大,远场艾里斑内的光强逐渐减小,合成效果变差。仿真计算了不同占空比条件下桶中功率(PIB)和β因子随倾斜角度的变化关系。仿真结果表明,随着子光束倾斜角度的增大,PIB和β因子两个评价指标均逐渐变差。为了达到一定的评价指标要求,必须利用快反镜等校正器件将各子光束的倾斜角度减小到一定的范围之内。A 4-channel model of coherent beam combination is established according to Fraunhofer diffraction theory, and the influence of tilt phase error on coherent beam combination with different duty ratios is studied. By using Euler＇s rotation, tilt angles of sub-beams are transformed into tilt phase errors, and then introduced into the combination model. Far-field intensity distribution of the combined beam with different duty ratios and tilt angles is calculated, and the influence of duty ratio and tilt an- gle is analyzed. Simulation results show that far-field intensity in the Airy disk decreases with increasing tilt angle, which means degraded combination effect. The dependencies of power in the bucket （PIB） and β factor on tilt angle with different duty ratios are calculated. It is demonstrated that both of the two criteria degenerate when tilt angle increases. It is concluded that to reach the required criteria, tilt angles of sub-beams should be reduced within certain limit by utilization of correction component such as fast steering mirror.

关 键 词：相干合成 倾斜角度 倾斜相差 快反镜 桶中功率 口因子 

分 类 号：TP273.2[自动化与计算机技术—检测技术与自动化装置]