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    Focal Volume Characterization of a Laser Scanning System

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    Author
    Whitsitt, Rebecca
    Issue Date
    2020
    Keywords
    beam waist
    knife edge
    laser scanner
    pinhole
    Advisor
    Ellis, Jonathan D.
    
    Metadata
    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, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Knife edge testing of a focused laser beam is a well-known method of observation of the position of focus. When this test is paired with pinhole scanning, a representation of the focal volume can be observed. These two methods are discussed and applied to an optical system that mimics laser-induced refractive index change (LIRIC), a femtosecond micromachining system developed at the University of Rochester to write diffractive patterns into ophthalmic hydrogels for vision correction. The focused, 405 nm, single-mode diode laser beam is modeled as Gaussian with a beam waist of 1.5 μm, and the experimentally measured waist was found to be between 8 μm. The beam quality is assessed in terms of Gaussian beam waist and the estimated beam quality factor M2, and the possibility of full characterization of the focal volume is explored. An f-theta lens is used to scan the beam, and the properties of f-theta lenses are discussed and modeled.
    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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