Astigmatism generating device.

摘要

A block-shaped optical device with an improved efficiency in the transmission of light through the device is disclosed. The block-shaped device (1) is made up of a first plane (11) on which incident light is presented at a predetermined incidence angle i1. The incident light is transmitted through the first plane and is reflected off of another plane (13) which is oriented at a predetermined angle alpha 1 with respect to a perpendicular to the first plane. The reflected light is next totally transmitted through an exit plane (12) situated parallel to the first plane. The incidence angle i1 is predetermined so that the angle at which the light is finally transmitted with respect to the exit plane is a polarization angle satisfying Brewster's rule. Therefore, at the exit plane, the light is totally transmitted and thus none of the light is reflected, resulting in a greatly improved degree of efficiency in the transmission of light through the device.