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Proceedings Paper

Polarization switching of sodium guide star laser for brightness enhancement
Author(s): Tingwei Fan; Tianhua Zhou; Yan Feng
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Paper Abstract

The efficiency of optical pumping that enhances the brightness of sodium laser guide star with circularly polarized light is reduced substantially due to the precession of sodium atoms in geomagnetic field. Switching the laser between left and right circular polarization at the Larmor frequency is proposed to improve the photon return. With ESO's cw laser guide star system at Paranal as example, numerical simulation for both square-wave and sine-wave polarization modulation is conducted. For the square-wave switching case, the return flux is increased when the angle between geomagnetic field and laser beam is larger than 60°, as much as 40% at 90°. The method can also be applied for remote measurement of magnetic field with available cw guide star laser.

Paper Details

Date Published: 27 July 2016
PDF: 8 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99095F (27 July 2016); doi: 10.1117/12.2229514
Show Author Affiliations
Tingwei Fan, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Tianhua Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Yan Feng, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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