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Proceedings Paper

Approaches to efficient coupling of laser beams to obscured telescopes
Author(s): Hamid Hemmati; Norman A. Page
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Paper Abstract

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.

Paper Details

Date Published: 26 April 2002
PDF: 7 pages
Proc. SPIE 4635, Free-Space Laser Communication Technologies XIV, (26 April 2002); doi: 10.1117/12.464108
Show Author Affiliations
Hamid Hemmati, Jet Propulsion Lab. (United States)
Norman A. Page, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 4635:
Free-Space Laser Communication Technologies XIV
G. Stephen Mecherle, Editor(s)

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