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根据高斯光束的性质,本文设计了一种利用普通连续激光器产生较高质量PIV片光源的光路系统。整个光路分为两部分,第一部分为原始光束优化光路,第二部分为片光分光光路。原始光束优化光路通过一系列凸凹透镜有序布置,将原来直径大于2mm的光斑在PIV实验区间控制到1mm以下。优化光路能有效集中激光能量,提高片光亮度。片光分光光路使用鲍威尔棱镜将激光光束分为扇形片光,再用平凸柱面镜将扇形片光汇聚为矩形片光。鲍威尔棱镜分得片光的能量在宽度方向分布较常规双凹柱面镜均匀。平凸柱面镜将扇形光源中分散在极宽区域的能量集中在固定宽度里,使得激光能量的有效利用率提高,有利于PIV实验。
According to the nature of the Gaussian beam, this paper presents an optical system using a conventional continuous laser to produce a higher quality PIV light source. The entire optical path is divided into two parts, the first part of the optical path for the optimization of the original beam, the second part of the optical splitting light path. The original beam optimized optical path through a series of convex and concave lenses in an orderly arrangement, the original diameter greater than 2mm spot controlled PIV experimental interval to 1mm below. Optimize the optical path can effectively concentrate the laser energy, improve film brightness. The beam splitting optical path using Powell prism laser beam is divided into fan-shaped piece of light, and then flattened cylindrical lens fan-shaped piece of light converged into rectangular piece of light. Powell prism split light energy in the width direction of the conventional double concave cylindrical mirror uniform. Planoconvex cylindrical mirrors focus the energy scattered in a very wide area of the fan-shaped light source in a fixed width so that the effective utilization of laser energy is improved, which is in favor of the PIV experiment.