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Proceedings Paper

Tilt angular correlation and tilt sensing techniques with a laser guide star
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Paper Abstract

The two techniques for sensing full aperture tilt with a laser guide star (LGS) are described. The first technique exploits a full aperture beam transmitting through the main optical train. The two auxiliary telescopes, which are separated from the transmitter in transverse directions, are used to measure a laser beacon image motion. The contribution of the down propagation path to the tilt that is measured with an auxiliary telescope is eliminated by averaging LGS image over a laser beacon angular extent. Such averaging requires FOV of the receiver which greatly exceeds the tilt angular correlation scale. A second method exploits a small aperture beam transmitted from behind a portion of a primary mirror of the main telescope. A laser beacon image motion is measured simultaneously with the main and auxiliary telescopes. A full aperture tilt is determined by subtracting the tilt measured with the main telescope from that measured with an auxiliary one. This method does not require transmitting laser irradiance through the main optical train, and it might be used for the mesospheric sodium layer. A scheme for measuring uncontrolled motion of the main telescope is also considered.

Paper Details

Date Published: 6 January 1997
PDF: 12 pages
Proc. SPIE 2956, Optics in Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing, (6 January 1997); doi: 10.1117/12.263169
Show Author Affiliations
Mikhail S. Belen'kii, Georgia Institute of Technology (United States)


Published in SPIE Proceedings Vol. 2956:
Optics in Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing
Adam D. Devir; Anton Kohnle; Christian Werner, Editor(s)

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