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Polarization switching of sodium guide star laser for brightness enhancement
Fan, Tingwei; Zhou, Tianhua; Feng, Yan; feng@siom.ac.cn
2016
Source PublicationADAPTIVE OPTICS SYSTEMS V
ISSN0277-786X
Department空间
AbstractThe 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 degrees, as much as 40% at 90 degrees. The method can also be applied for remote measurement of magnetic field with available cw guide star laser.
Language英语
Document Type会议论文
Identifierhttp://ir.siom.ac.cn/handle/181231/27394
Collection空间激光信息技术研究中心
Corresponding Authorfeng@siom.ac.cn
Affiliation中国科学院上海光学精密机械研究所
Recommended Citation
GB/T 7714
Fan, Tingwei,Zhou, Tianhua,Feng, Yan,et al. Polarization switching of sodium guide star laser for brightness enhancement[C],2016.
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