摘要
运用矩阵光学理论以及将硬边光阑窗口函数展开为有限个复高斯函数之和的方法,对激光束辐照猫眼光学镜头时产生的猫眼效应机理进行了理论推导.通过数值计算对猫眼效应的反射规律进行了分析,并利用532nm激光辐照一个变焦范围为12—72mm的光学镜头进行了猫眼效应的实验验证,从而得出了猫眼效应反射光特性与入射激光参数以及猫眼光学镜头的口径、焦距、离焦量等基本参数之间的关系.研究表明,猫眼效应反射光特性与猫眼光学镜头参数和入射激光参数密切相关,且当猫眼光学镜头位于近场和远场的情况有很大不同.根据入射光束的束腰位置与猫眼光学镜头之间的距离,选取合适的正离焦量可以在猫眼效应反射光原路返回处得到比非离焦时更高的峰值光强,这与传统的根据几何光学理论得出的非离焦时可以得到最高峰值光强的结论不同.
Using the theory of matrix optics and expanding the aperture function into a sum of finite complex Gaussian functions, this paper theoretically deduces the mechanism of cat eye effect generated by laser irradiation on the cat eye optical lens and analyzes the reflection law of cat eye effect through numerical computation. Then an experiment is operated to validate the cat eye effect by making 532 nm laser irradiate on an optical zoom lens whose focus is ranged between 12 and 72 mm. By using the above method, the law governing the variation of laser reflection characteristics with the parameters of the transmitting laser beam and the cat eye optical lens, including aperture, focus and focal shift ete, is established. The study reveals that the reflection characteristics of cat eye effect are intimately correlated with the parameters of the cat eye optical lens and transmitting laser beam, furthermore, the characteristics would change obviously when there is a large change in the distance between the waist of the incident beam and the cat eye optical lens. In particular, a reasonable choice of the positive focal shift would result in a higher peak intensity at the return place than that of no focal shift, when the distance between the waist of the incident beam and the cat eye optical lens varies, whereas the former conclusion based on geometry optics was that the highest peak intensity could be obtained when the optical lens has no focal shift.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期2284-2294,共11页
Acta Physica Sinica
关键词
猫眼光学镜头
猫眼效应
高斯光束
反射特性
eat eye optical lens, cat eye effect, Gaussian beam, reflection characteristics
