【作者】 马华；

【导师】 曾晓东；

【作者基本信息】 西安电子科技大学 ， 光学工程， 2006， 硕士

【摘要】 半导体激光器在军事、工业、医学等许多方面有着重要的应用前景，但由于半导体激光器输出光束具有较大的发散角，因而在几乎所有要求较高的应用领域中，其输出光束都必须通过特殊的光学系统进行准直。柱透镜因其结构简单、材料便宜以及加工容易而在半导体激光束准直领域获得较多的应用，但普通的圆柱透镜其准直能力非常有限，为了提高柱透镜的光束准直能力，设计出更加合理和可行的结构是目前在这方面研究的主要方向之一。 双半圆柱透镜是作者首次提出的一种复合结构柱透镜，它突破了普通圆柱透镜在最佳准直时对透镜材料折射率必须小于2的限制，在透镜材料大于2甚至更高的条件下，其准直能力大大提高，准直效果在理论上可达0.1mrad。本文以光线光学为基础，对双半圆柱透镜准直半导体激光束问题进行了系统分析并给出了数值模拟结果。理论分析和数值模拟均表明：双半圆柱透镜与普通圆柱透镜相比，材料选择更加宽广、准直效率更高；与同等准直水平的非球面柱透镜相比，双半圆柱透镜结构更加简单、更易加工和装配，因此，双半圆柱透镜在半导体激光束准直方面将具有更好的应用前景。 非球面柱透镜是另一类特殊结构的柱透镜，在用于半导体激光束准直时，理论上可以达到完全准直的效果。非球面柱透镜曲面的数学描述是人们目前关注较多的问题之一，作者使用数值拟合的方法，对其进行了数值拟合并给出了精度分析，结果表明：该方法简单、直观，能够完全满足特定精度的要求，从而可以方便地用于非球面柱透镜的分析和设计。更多还原

【Abstract】 Laser diodes have been widely used in many fields such as military, industry and medicine use, however, a Laser Diode has large divergence angle, and the output beam must be collimated by optical systems in most practical work. Because of simple structure and easy fabricating, the cylindrical lenses have been used in many practical applications for beam collimating of LDs.A compound structure—Double Half-cylindrical Lens(DHCL) is proposed firstly by the author. On the basis of ray optics, the theoretical expressions of the collimated beam by a DHCL are derived, and the numerical results are also given. Both theoretical and numerical results indicate that a DHCL can be made from the high refractive index material, but a normal cylindrical lens can’t, and the collimating performance of a DHCL is much better than that of a normal cylindrical lens, and the divergence angle of the collimated beam could be as small as 0.1 mrad.The non-spherical lens is another shaping system that is used to collimate the beam of LD, and the theoretic performance could be perfect. The mathematics description of the non-spherical lens is the most important problem for the beam shaping system design. A numerical simulating method and its precision analysis are given, and the results indicate that this method is simple, and can be used for the design of LD beam collimating system with non-spherical lens.更多还原