Effects of atmospheric turbulence on the return photon flux of sodium laser guide star

Xiangyuan Liu; Xianmei Qian; Chuanyu Fan; Chengtao Du; Chengling Lu; Lei Zhang; Huan Yang

doi:10.1117/12.2267964

8 March 2017 Effects of atmospheric turbulence on the return photon flux of sodium laser guide star

Xiangyuan Liu, Xianmei Qian, Chuanyu Fan, Chengtao Du, Chengling Lu, Lei Zhang, Huan Yang

Proceedings Volume 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016; 102553S (2017) https://doi.org/10.1117/12.2267964
Event: Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 2016, Jinhua, Suzhou, Chengdu, Xi'an, Wuxi, China

Abstract

The circular-polarized laser can excite Sodium Laser Guide Star (SLGS) to obtain a large number of the return photons. Re-pumping technology can further enhance the return photon flux of SLGS. But laser propagating in the atmosphere suffers the atmospheric turbulence which causes the stochastic distributions of laser intensity in mesosphere. This leads to the fluctuations of return photon flux as the strength of atmospheric turbulence. We study effects of atmospheric turbulence on the return photon flux of SLGS under the Hufnagle-vally5/7(HV5/7), Greenwood and Mod-HV models by numerical simulation. Results show that both the return photon flux and fluctuations under the strong atmospheric turbulence are more than those under the weak one. Comparing re-pumping with no re-pumping, increment of the return photon flux under the three atmospheric turbulence models increase with the decreasing strength of atmospheric turbulence. But the fluctuations of the return photon flux greatly decrease for re-pumping.

Citation Download Citation

Xiangyuan Liu, Xianmei Qian, Chuanyu Fan, Chengtao Du, Chengling Lu, Lei Zhang, and Huan Yang "Effects of atmospheric turbulence on the return photon flux of sodium laser guide star", Proc. SPIE 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 102553S (8 March 2017); https://doi.org/10.1117/12.2267964

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KEYWORDS

Sodium

Atmospheric turbulence

Atmospheric modeling

Chemical species

Mesosphere

Laser guide stars

Continuous wave operation

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