17 May 2006 Studies of a mesospheric sodium guidestar pumped by continuous-wave sum-frequency mixing of two Nd:YAG laser lines in lithium triborate
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Proceedings Volume 6215, Atmospheric Propagation III; 62150K (2006); doi: 10.1117/12.673121
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States
Abstract
Mesospheric sodium guidestar radiance is plotted vs. wavelength, fasor power, fasor polarization and date. Peak radiance for circular polarization was about 7000 photons/sec/cm2 (V1 magnitude = 5.1) for 30 watts of pump power in November of 2005. Pumping with circular polarization at high power produces about 2 times more return than linear polarization. Pumping D2a at high power produces about 12 times more return than pumping D2b. A lidar equation is used to determine column density. Estimated maximum possible guidestar radiance is about 3 times greater than measured values. Guidestar radiance may be saturated by atoms becoming trapped in F'=1 and atomic recoil.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John Telle, Jack Drummond, Craig Denman, Paul Hillman, Gerald Moore, Steven Novotny, Robert Fugate, "Studies of a mesospheric sodium guidestar pumped by continuous-wave sum-frequency mixing of two Nd:YAG laser lines in lithium triborate", Proc. SPIE 6215, Atmospheric Propagation III, 62150K (17 May 2006); doi: 10.1117/12.673121; https://doi.org/10.1117/12.673121
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KEYWORDS
Polarization

Chemical species

Sodium

Optical pumping

Sodium guide stars

Estimation theory

Telescopes

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