Comparison of pump-laser characteristics for producing a mesospheric sodium guidestar for adaptive optical systems on large-aperture telescopes

Details Comparison of pump-laser characteristics for producing a mesospheric sodium guidestar for adaptive optical systems on large-aperture telescopes Comparison of pump-laser characteristics for producing a mesospheric sodium guidestar for adaptive optical systems on large-aperture telescopes

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3264...37t&link_type=abstract

Proc. SPIE Vol. 3264, p. 37-42, High-Power Lasers, Santanu Basu; Ed.

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We compare the effectiveness of various laser systems for producing a sodium guidestar in the mesosphere for large aperture telescopes. We discuss the requirements for two applications at two sites: satellite imaging at the Starfire Optical Range in Albuquerque, New Mexico (SI) and infrared astronomy at the Steward Observatory in Tucson, Arizona (IR). SI may use either a hybrid system employing a rayleigh and a sodium guidestar or a system employing only a sodium guidestar. IR will use only a sodium guide star. Our results are based on analysis and computation that have been compared to 5 different experiments. Parameters included in our comparison are pulse format, polarization, center frequency, and bandwidth. The infrared astronomy application power requirements are low enough that state of the art laser technology can meet them. But the satellite imaging application is problematic. Required powers are sufficiently high that thermo-optic effects in materials can be a problem.

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