Patent ID: 7898750

Claim:
An optical system having an optical axis, said optical system comprising: (I) a light source; (II) a reflector; and (III) a lens component situated between the light source and the reflector; (IV) a receiver, wherein the light source and the receiver are situated substantially symmetrically and are decentred with respect to the optical axis and are separated by a distance d from one another; wherein: (a) the lens component is positioned to provide a collimated beam when intercepting light from the light source, and (b) the reflector is situated to intercept the collimated beam and to reflect the collimated beam to the receiver through the lens; and such that the collimated beam is at an angle Θ′ to the optical axis; and (c) the lens component is structured to provide on the receiver an image of the light source, said image characterised by (i) astigmatism of more than 0.05 waves RMS, and less than 0.1 waves RMS, when the lens component is not misaligned with respect to the average emission angle of the light source; and (ii) astigmatism of less than 0.05 waves RMS for tilt angles of 2 to 5 degrees, when the lens component is tilted by 2 to 5 degrees with respect to the average emission angle of the light source.