Patent ID: 8355214
Filing Date: 2013-01-15
Classification: G02B

Abstract:
1. An apparatus for collecting light from a source into a beam of light, said apparatus comprising: a front surface comprising a selectively light transmitting portion; a back surface comprising a reflecting portion; and an internal region disposed between the front surface and back surface; said selectively light transmitting portion comprising a side facing the internal region which selectively reflects light incident from the source back through the internal region towards the reflecting portion of the back surface; said reflecting portion of the back surface reflecting the light from the front surface back through the internal region towards the front surface; and said selectively light transmitting portion selectively transmitting at least a portion of light incident from the reflecting portion of the back surface out of the internal region to form the beam of light; the apparatus having a focal point located in a focal plane, and wherein: the front surface and back surface are aspherical surfaces adapted to substantially eliminate spherical and comatic aberration associated with light collected from the source located proximal to the focal point.