An optical coupling element for use in large numerical aperture collecting
and condensing systems. The optical coupling element includes a curved
surface such as a lens at the output of a tapered light pipe (TLP). The
TLP in combination with the curved surface alters the divergence angle and
the area of the light exiting the curved surface. Electromagnetic
radiation emitted by a source is collected and focused onto a target by
positioning the source of electromagnetic radiation substantially at a
first focal point of a primary reflector so that the primary reflector
produces rays of radiation reflected from the primary reflector that
converge at a second focal point of the secondary reflector. The optical
coupling element is positioned so that its input end is substantially
proximate with the second focal point of the secondary reflector. The
converging rays of radiation reflected from the secondary reflector pass
through input end and are transmitted towards the curved surface, where
their divergence angle and area are adjusted.
