Approaches to efficient coupling of laser beams to obscured telescopes

Details Approaches to efficient coupling of laser beams to obscured telescopes Approaches to efficient coupling of laser beams to obscured telescopes

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4635..288h&link_type=abstract

Proc. SPIE Vol. 4635, p. 288-294, Free-Space Laser Communication Technologies XIV, G. Stephen Mecherle; Ed.

Physics

Optics

Scientific paper

For free-space propagation, often laser sources with Gaussian intensity profile are utilized. A Cassegrainian telescope's central obstruction can block a significant amount of the transmitted beam energy. The previously known approaches to solve the problem include: use of an axicon optical element and or sub-aperture illumination of the telescope primary mirror. Two new approaches have been identified to eliminate all secondary mirror and baffle vignetting. These approaches include a beam-slicer and a beam-splitter/combiner optics. The new approaches eliminate the precise alignment required for axicon devices and are simple to fabricate. The beam-splitter/prism combiner approach results in a clean far field pattern and has transmission divergence that is limited to the diffraction limit for each of the sub-aperture transmission beams.

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