外文题目: Polarization switching of sodium guide star laser for brightness enhancement
作者: Fan, Tingwei; Zhou, Tianhua; Feng, Yan
刊名: Proc.SPIE
来源图书: ADAPTIVE OPTICS SYSTEMS V
年: 2016 卷: 9909 文章编号：99095F
会议名称: Conference on Adaptive Optics Systems V
英文关键词:
Polarization switching; laser guide stars; Larmor precession; geomagnetic field
MESOSPHERIC SODIUM; EXCITATION; BEACON; FIELD; LAYER
英文摘要:
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 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.


文献类型: 会议论文
正文语种: English
收录类别: ISTPEI
DOI: 10.1117/12.2229514


全文传递服务