激光技术, 2011, 35 (6): 833, 网络出版: 2011-11-09
Wollaston棱镜对发散光束的分束特性分析
Effect of Wollaston prism on splitting properties of divergent beam
光学器件 Wollaston棱镜 控制变量法 发散光束 发散角 optical devices Wollaston prism controlling variables method divergent beam divergent angle
摘要
为了了解Wollaston棱镜用于发散光束时对出射o光束、e光束发散角的影响,利用折射定律对发散光束两边缘光线通过Wollaston棱镜后的o光、e光分束角进行了推导,采用控制变量法分析了发散光束经过Wollaston棱镜后岀射的o光束和e光束的变化,得出了Wollaston棱镜对出射o光束、e光束发散角的影响。结果表明,相对入射光束的发散角,Wollaston棱镜对o光束有减小发散角的作用,对e光束有增大发散角的作用;对于一定结构角的棱镜,当入射光的波长变大时,o光束发散角增大,而e光束发散角减小;对于确定的单色发散光束,当结构角增大时,o光束发散角减小,而e光束发散角增大;无论是入射光的波长还是棱镜结构角的变化,对出射o光束、e光束发散角的影响都是有限的。由此可见,在要求不是太高的应用中,可以忽略Wollaston棱镜对出射o光束、e光束发散角的影响。
Abstract
In order to know the effect of a Wollaston prism on o beam and e beam when it is applied to divergent beam, the splitting angles of o light and e light were respectively deduced according to refraction law when both edge rays of the divergent beam incident on a Wollaston prism. The variation of emergent o beam and e beam was analyzed with the method of controlling variables as divergent beam passing through a Wollaston prism, and the effect of a Wollaston prism on the divergent angle of obeam and e beam was obtained. The result show the divergent angle of o beam becomes larger than that of the incident beam and the divergent angle of e beam becomes larger; For a prism with given structure angles, the divergent angle of o beam increases when the wavelength of incident light increases, but the divergent angle of e beam decreases. For a certain monochromatic divergent beam, the divergent angle of o beam increases with the decrease of structure angle, while e beam increased with it. Both of the changes of incident light’s wavelength and prism’s structure angle have limit effect on the divergent angles of o beam and e beam. The effect of a Wollaston prism on the divergent angles of o beam and e beam can be neglected in the application with lower precision requirements.
薛林, 吴福全, 蒋琳琳. Wollaston棱镜对发散光束的分束特性分析[J]. 激光技术, 2011, 35(6): 833. XUE Lin, WU Fu-quan, JIANG Lin-lin. Effect of Wollaston prism on splitting properties of divergent beam[J]. Laser Technology, 2011, 35(6): 833.