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    Dynamically refocused Rayleigh beacons for adaptive optics

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    Author
    Georges III, James Augustus
    Issue Date
    2003
    Keywords
    Engineering, Electronics and Electrical.
    Physics, Optics.
    Advisor
    Angel, Roger
    
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    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Dynamic refocus, DR, for adaptive optics has been proposed as a process that, over a given range, will maintain a sharp image of the Rayleigh backscatter due to a laser pulse rising in the atmosphere. Sharp focus is important when the backscatter from an artificial star is used for wavefront sensing. The wavefront variance associated with a Shack Hartmann wavefront sensor is inversely related to the photon return (in the shot noise limited case) and is dependant on the square of the beacon image's angular size. For the same spot size the photon return of a dynamically refocused Rayleigh beacon is increased by a factor of twelve over a system without DR. Here we present the implementation and results of the first operational Rayleigh beacon DR system. The DR system is designed for use on the MMT with five Rayleigh laser beacons projected on a 120arcsec regular pentagon. It was tested on the Mt. Bigelow 61" telescope, configured to act as an off-axis MMT subaperture. The results show the simultaneous DR of five Rayleigh beacons where a beacon image is dynamically refocused from 7arcsec FWHM to 2.7arcsecFWHM.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Optical Sciences
    Degree Grantor
    University of Arizona
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