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Optimal wavelength of Rayleigh laser beacon

机译：瑞利激光信标的最佳波长

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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.
机译：必须要有一个自适应光学系统才能达到既定的信噪比，即每个子孔径中都有足够的信号光子通量。这要求成像的物体足够明亮，或者在视野内有明亮的引导星。然而，不幸的是，在自然界和人工导星所需要的情况下，这种情况经常发生。到目前为止，有两种人造信标。它们是钠​​激光制导星和瑞利制导星。后者是由平流层激光束的瑞利散射产生的。更具体地说，地面发射器发射的激光束向上传播，并沿途经历大气的吸收和散射。显然，只有在指定的高度范围内散布大气是有益的。因此，我们始终希望在此范围内的瑞利散射会很强，而吸收最大程度地会很弱。在规定的高度下，散射和吸收越弱越好。吸收率或散射率取决于激光束的波长并与大气构成有关。在本文中，通过争取透射率和散射的相对极值，提出了瑞利激光信标的最佳波长。

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