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    Spatial Light Modulator-Based Shack Hartmann Wavefront Sensor With Built In Influence Matrix Measurement

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    Author
    Jin, Moonseob
    Issue Date
    2018
    Keywords
    Adaptive optics
    Diffractive optics
    Lenslet array
    Shack Hartmann wavefront sensor
    Spatial light modulator
    Advisor
    Hart, Michael
    
    Metadata
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    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, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The Shack Hartmann wavefront sensor (SHWFS) is used to detect the incoming aberrated wavefront for use with an adaptive optics system by using a 2-D lenslet array to produce an array of spots and recording the spot deviations near the focal plane. The size and number of lenslets within the array is closely related to the exposure time and resolution of the WFS and depends on the irradiance of the target, the atmospheric situation inside the FOV, and the optical performance of the adaptive optics system. Since a WFS normally has a fixed number of lenslets and aperture size, to make the WFS work properly, it requires a well-suited calibration process using a planar wavefront. It produces difficulties in the optimization of the system when varying circumstances are introduced. In this paper, we describe how by delaying the phase at each pixel, an SLM (Spatial Light Modulator) is used to build lenslets with different sizes and aperture counts. The multimode WFS has calibration data for each mode before operating the system and depending on the variable circumstances it is able to easily convert to another mode even as the system operates. This paper describes the setup of a multimode wavefront sensor using an SLM, the construction of a lenslet array using an SLM-generated Fresnel lens, and the theory of calibration and reconstruction. We also prove the capability of the WFS performance by measuring a wavefront aberrated by a phase plate.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Optical Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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