Optimal wavelength for Rayleigh laser beacon

Jixiang Yan; Yu Xin; Changning Zhou

doi:10.1117/12.549408

25 October 2004 Optimal wavelength for Rayleigh laser beacon

Jixiang Yan, Yu Xin, Changning Zhou

Proceedings Volume 5490, Advancements in Adaptive Optics; (2004) https://doi.org/10.1117/12.549408
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

It is necessary for an adaptive optics system to be excepted to achieve established signal-noise ratio that enough signal photon fluxes are there in every subaperture. This requests that either the object imaged is bright enough or there is a bright guide star within the field of view. However, it is unfortunately as often as not in the case in nature and the artificial guide stars have need for. There are two kinds of artificial beacons up to now. They are sodium laser guide star and Rayleigh guide star. The latter among which is generated by the Rayleigh scatter of laser beam from stratosphere. More specially, the laser beam transmitted by ground transmitter propagates upward and undergoes the absorption and the scatter of the atmosphere along the way. It is obvious that only the scattering of the atmosphere within specified altitude range is beneficial. So we always hope that the Rayleigh scattering in this range would be strong and the absorption would be weak to the greatest extent. Under stated altitude, both the scattering and the absorption are the weaker the better. Either the absorbance or the scatterance is dependents on the wavelength of the laser beam and relates to the atmospheric constitution. In this paper, the optimum wavelength for Rayleigh laser beacons is presented by striving for relative extreme values of the transmissivity and the scattering.

Citation Download Citation

Jixiang Yan, Yu Xin, and Changning Zhou "Optimal wavelength for Rayleigh laser beacon", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); https://doi.org/10.1117/12.549408

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