光学胶折射率对渥拉斯顿棱镜透射性能的影响

Influence of the refractive index of optical cement on Wollaston prisms' transmitting performance

为了使渥拉斯顿棱镜具有更好的透射性能,从理论上分析了光学胶折射率对渥拉斯顿棱镜透射光光强分束比、总透射比的影响,得到了关于光学胶折射率与棱镜透射光光强分束比及总透射比的关系式,并拟合出了关系曲线。结果表明,光学胶折射率对渥拉斯顿棱镜的光强分束比和总透射比均有影响;且无论棱镜的结构角是大是小,光强分束比为1和总透射比的最大值对应着同一光学胶折射率,对633nm的光而言,此折射率值为1.570。这一结果对优化渥拉斯顿棱镜的性能是非常重要的。

In order to make the Wollaston prisms get better transmitting performance, the influence of the refractive index of optical cement used in Wollaston prisms on the splitting ratio and the transmission was analyzed in this paper. The relationship formula about the refractive index of optical cement and the splitting ratio and the transmission was worked out, and besides, the relationship curves were fitted by computer. The result indicates that the refractive index of optical cement used in Wollaston prisms can influence both the splitting ratio and the transmission ; and especially when the value of the splitting ratio is 1 and the value of total transmission reaches the maximum, the value of refractive index of optical cement is the same. If the wavelength of the light is 633nm, the value of the index is 1. 570. The result is very helpful for optimizing the transmitting performance of Wollaston prisms.