激光探测告警光学系统设计

为满足激光探测告警光学系统对大视场和光学增益的要求,提出了宽视场有增益光学系统。该系统工作波长范围1.06~1.54μm,全视场角60°,最大口径28mm,PIN光电探测器光敏面直径2mm。物镜采用二片式反远距结构,增大了视场和后工作距离。弯月型负透镜在前,具有平衡像差和棱镜的偏向作用;物镜后放置高折射率标准超半球型浸没透镜,满足小光敏面探测器接收。分析结果表明,系统像高0.99mm,光学增益达15.33,结构简单,可有效降低激光辐射源功率、增强探测距离。

Design of laser detection and warning optical system

In order to meet the demands of laser detection and warning optical system with large field-of-view (FOV) and optical gain, a wide-FOV optical system with optical gain was proposed. In this system, the operating wavelength range is 1.06~1.54 microns, and full angle of view is up to 60 degrees. The largest aperture is 28mm and the photosensitive surface diameter of PIN photoelectric detector is 2mm. A retrofocus structure with two elements is used in the object lens to enlarge FOV and back working range, in the head of which the negative meniscus have the effect of balancing aberration and deviating rays like a prism. And a standard hyperhemisphere immersion lens with high refractive index is put behind the object lens to satisfy the receiving of a detector with smaller photosensitive surface. The analyzed results show that the image height is 0.99mm and the optical gain in the compacted system is up to 15.33. It redounds to reduce the power of laser and enhances the distance detected.