提出一种相干激光阵列合束孔径装填的新方法,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束装填为远场单一主瓣的光束,给出了相应设计方案,并进行了模拟相干激光阵列合束孔径装填的原理性演示实验。实验结果表明,这是一种实现高功率和高亮度激光的有效技术方案。逆达曼光栅用于相干阵列激光合束是基于远场衍射原理,阵列面和光栅面为严格的傅里叶变换关系,具有原理简单、性能稳定可靠的特点,能够控制输出光束尺寸及其远场光束宽度,对于发展紧凑型、轻量化和高光束质量的高功率激光器系统具有重要意义。

A new beam combining and aperture filling technique using conjugate Dammann grating is introduced to direct all the energy of a mutually coherent laser array to the far-field main lobe in theor. The design scheme of beam combination for one-and two-dimensional coherent laser arrays is demonstrated. An experiment using an idealized simulated laser array with a mask is performed,which verifies the proposed concept. Experimental results show that such a beam combination scheme is efficient technique for the high-brightness and high-power laser systems. This technique is based on the far-field diffraction theory. The relation between grating plane and array plane is Fourier transformation. The aperture size and power density of the combined beam can be conveniently changed. It is very significant for the development of compact,light weight,and high-quality laser systems.