Patent ID: 8684545

Claim:
An optical device, comprising: a non-imaging secondary concentrator having an entry aperture and an exit aperture, and configured to receive light focused by a primary focusing element from a source onto the entry aperture; wherein the non-imaging secondary concentrator comprises: a first portion proximal the entry aperture which is rotationally symmetric about an optic axis; a second portion exit aperture which is not rotationally symmetric about the optic axis; further comprising a receiver located proximal to the exit aperture of the secondary concentrator, wherein the receiver is optically coupled to the exit aperture of the secondary concentrator, wherein the second portion extends and tapers along the optic axis from a wide end proximal the first portion to a narrow end comprising the exit aperture, wherein the shape of the exit aperture corresponds to the shape of the receiver, wherein the receiver is square shaped, and the second portion of the non-imaging secondary concentrator comprises a truncated substantially square pyramidal portion, which extends and tapers along the optic axis from a wide end proximal the first portion to a narrow end comprising the exit aperture.