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17 July 2018 Simulations of continuous-wave sodium laser guide stars with polarization modulation at Larmor frequency
Felipe Pedreros Bustos, Ronald Holzlöhner, Simon Rochester, Domenico Bonaccini Calia, Joschua Hellemeier, Dmitry Budker
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Proceedings Volume 10703, Adaptive Optics Systems VI; 107033R (2018) https://doi.org/10.1117/12.2313694
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States
Abstract
The return flux from a sodium laser guide star suffers, at large angles between the geomagnetic field and the laser beam, from the reduction in optical pumping due to spin-precession of sodium atoms. This detrimental effect can be mitigated by modulating the circular polarization of a continuous-wave laser beam in resonance with the Larmor frequency of sodium atoms in the mesosphere. We present an investigation based on numerical modeling to evaluate the brightness enhancement of a laser guide star with polarization modulation of a continuous-wave laser beam at different observatories.
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Felipe Pedreros Bustos, Ronald Holzlöhner, Simon Rochester, Domenico Bonaccini Calia, Joschua Hellemeier, and Dmitry Budker "Simulations of continuous-wave sodium laser guide stars with polarization modulation at Larmor frequency", Proc. SPIE 10703, Adaptive Optics Systems VI, 107033R (17 July 2018); https://doi.org/10.1117/12.2313694
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KEYWORDS
Modulation
Polarization
Sodium
Continuous wave operation
Laser guide stars
Mesosphere
Optical pumping
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