Physics – Optics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3353..330m&link_type=abstract
Proc. SPIE Vol. 3353, p. 330-339, Adaptive Optical System Technologies, Domenico Bonaccini; Robert K. Tyson; Eds.
Physics
Optics
Scientific paper
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 D(subscript 2) continuum. This paper reviews the theory and design of the Fiber Raman Guidestar Laser being developed for Astronomical Adaptive Optical systems.
Austin William L.
Bonaccini Domenico
Murray James T.
Powell Richard C.
Roberts William T.
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