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Proceedings Article

Approaches to efficient coupling of laser beams to obscured telescopes

[+] Author Affiliations
Hamid Hemmati, Norman A. Page

Jet Propulsion Lab. (USA)

Proc. SPIE 4635, Free-Space Laser Communication Technologies XIV, 288 (April 30, 2002); doi:10.1117/12.464108
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From Conference Volume 4635

  • Free-Space Laser Communication Technologies XIV
  • G. Stephen Mecherle
  • San Jose, CA | January 18, 2002

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.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Hamid Hemmati and Norman A. Page
"Approaches to efficient coupling of laser beams to obscured telescopes", Proc. SPIE 4635, Free-Space Laser Communication Technologies XIV, 288 (April 30, 2002); doi:10.1117/12.464108; http://dx.doi.org/10.1117/12.464108


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