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Proceedings Paper

Fiber Raman laser for sodium guide star
Author(s): James T. Murray; W. Thomas Roberts; William Lucas Austin; Richard C. Powell; Domenico Bonaccini
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Paper Abstract

The generation of sodium guide stars through laser excitation imposes very specific requirements on the laser. It has been argued that the most effective sodium guide star laser would operate CW with a mode spacing of less than the 10 MHz Doppler broadening profile of the mesospheric sodium. However, achieving high power in free-space optics with these requirements becomes very difficult because of the limited active gain volume and exceedingly long cavity requirement. The clear solution to these impediments is the development of a fiber raman laser (FRL) to shift the output of a solid state laser to a harmonic of the 589 nm sodium transition. The specific wavelength and bandwidth are selected from the large Raman gain spectrum by application- specific Distributed Bragg Reflectors. The guided-wave nature of the FRL allows for very large interaction volumes, while the long fiber length allows for narrowly-spaced modes which easily fill the sodium D2 continuum. This paper reviews the theory and design of the Fiber Raman Guidestar Laser being developed for Astronomical Adaptive Optical systems.

Paper Details

Date Published: 11 September 1998
PDF: 10 pages
Proc. SPIE 3353, Adaptive Optical System Technologies, (11 September 1998); doi: 10.1117/12.321725
Show Author Affiliations
James T. Murray, Lite Cycles, Inc. (United States)
W. Thomas Roberts, Lite Cycles, Inc. (United States)
William Lucas Austin, Lite Cycles, Inc. (United States)
Richard C. Powell, Optical Sciences Ctr./Univ. of Arizona (United States)
Domenico Bonaccini, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 3353:
Adaptive Optical System Technologies
Domenico Bonaccini; Robert K. Tyson, Editor(s)

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