一种可用于激光周视探测的发射光学系统设计

为了改善大功率半导体激光器快轴和慢轴两个方向光束质量极不均衡这一光束特性,基于几何光学的折射原理,经过理论分析和软件模拟实验设计了一套发射光学系统,采用柱面镜改变快轴和慢轴的发散度,使输出光束在子午方向上以窄视场发射,在弧矢方向上覆盖±30°的视场,并加入特殊结构的棱镜混光,得到目标区域内能量分布均匀性大于75%的窄带状光束,能量利用率达80%以上。结果表明,单套发射系统可以完成工作距离15m以内的±30°视场探测,6套发射系统构成360°视场完成周视探测。这一结果对于提高激光主动探测的精度和增大其使用范围是有帮助的。

An emitting optical system design for laser panorama detection

In order to improve the beam characteristics of high-power laser diode, whose beam quality is quite different in fast axis and slow axis, a set of emitting shaping system was designed through theoretical analysis and software simulation based on geometrical optics of refraction. As beam divergence of fast axis and slow axis is changed by cylindrical lens separately, the beams radiate in the meridional direction to the narrow field of view, and cover the field of view of ±30° in the sagittal direction. Meanwhile, a prism of special structure was added in the shaping system to mix light. Consequently, the uniformity of energy distribution of the output beam became greater than 75% within the target area, and the energy utilization rate reached to 80% or more. The results show that a single emitting system can complete the detection of ±30° field of view within the work distance of 15m, and six emission systems constitute a 360° field of view to complete panorama detection. This result is helpful for improving the accuracy of the laser active detection and increasing its scope.