二维激光阵列逆达曼光栅相干合束理论研究

Research on Two-Dimensional Coherent Laser Array Beam Combination Using Conjugate Dammann Grating

采用逆达曼光栅及相位补偿原理将多束锁相相干的阵列激光合成为远场单一主瓣光束是一种实现高功率和高亮度相干合束的技术方案。以5×5和32×32二维相干激光阵列为例进行了理论模拟分析,同时分析了逆达曼光栅相干合束实验中相位板相位误差、逆达曼光栅对准误差和放置角度误差对合束效率的影响。理论分析及数值模拟计算结果表明,逆达曼光栅可用于相干激光阵列合束,但误差对相干激光阵列合束效率有较大的影响。因此,在实验中乃至发展基于逆达曼光栅的高功率激光器系统时,需要减小相位补偿板的相位加工误差,精密调节逆达曼光栅的位置,以减小误差对于合束效率的影响。

Phase-locked coherent laser array beam combination using conjugate Dammann grating and phase compensation is used to achieve high power and high brightness coherent beam combination. Theoretical analysis of the beam combination of 5×5 and 32×32 two-dimensional laser arrays using conjugate Dammann grating is carried out through numerical simulation, and the influences of the errors in the phase values of the phase plate, the matching and positioning of the conjugate Dammann grating to the beam combination efficiency during the experiment are also studied. The results of theoretical analysis and numerical simulation show that this is an efficient beam combination technique, however, these errors have a great influence on the total beam combination efficiency. This means that the manufacturing of the phase plate and positioning of the conjugate Dammann grating should be taken great care of during the experiment and the development of high power laser system based on conjugate Dammann grating, which will benefit the development of the compact, light, high efficiency and high beam quality high-power laser system.