Vol. 35, issue 10, article # 11

Abstract:

The work is devoted to the application of laser guide stars (LGS) technology for the adaptive optics system of a ground-based telescope. The results of the study of the possibilities of correcting the global wavefront tilt with the use of LGS are presented. To approaches are compared: polychromatic LGS, where the correction signal is a difference random refraction due to the atmosphere for different optical radiation wavelengths, and traditional monochromatic LGS, where an LGS is considered as a point source with a random center. The calculations were performed in the approximation of the Huygens–Fresnel method. It is shown that in this approximation, the signal from a monostatic monochromatic LGS used to correct the global wavefront tilt is comparable to the signal from a polychromatic LGS. Seasonal changes in the concentration and altitude of the mesospheric sodium layer, which determines the characteristics of sodium LGS, are estimated for Russian observatories.

Keywords:

laser guide star, adaptive optics, atmospheric turbulence

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