基于双柱透镜慢轴准直激光二极管堆栈光束匀化系统

为实现高功率激光二极管堆栈光束的匀化与整形，提出基于双柱透镜慢轴准直的匀化系统。利用双柱透镜实现对高填充因子激光二极管慢轴方向光束发散角度的压缩，降低成像型多孔径光束积分器中微透镜的数值孔径，减小匀化系统体积。通过三个限定条件确定了双柱透镜参数取值范围，并通过像差分析对双柱透镜进行了优化，实现慢轴方向光束剩余发散角度1.74。结合成像型多孔径光束积分器，设计了激光二极管堆栈的匀化系统，并进行了实验测试。实验结果表明，在中心光斑尺寸约为6 mm6 mm范围内，光斑不均匀性为8.11%。

Homogenization system for laser diode stack beams based on double cylindrical lenses of slow axis direction

In order to realize the spot homogenization and beam shaping of high-power laser diode stack, a homogenization system is proposed based on double cylindrical lenses in the slow axis direction. The double cylindrical lenses are used to collimate beams of high fill factor laser diodes in the slow axis direction, for decreasing the numerical aperture of microlenses in the imaging multi-aperture integrator and reducing the homogenization system volume. Through three limiting conditions, the parameter ranges of the double cylindrical lenses are determined. By analyzing the effect of aberration on slow axis collimation, the double cylindrical lenses are optimized to achieve the remaining divergence angle of 1.74. With the imaging multi-aperture beam integrator, the homogenization system for laser diode stack beams is designed and verified through experimental test. The experimental results show that the size of central spot on the target plane is about 6 mm6 mm and the spot inhomogeneity reaches to 8.11%.