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    Towards instantaneous spectrally controlled interferometry

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    Author
    Salsbury, Chase
    Olszak, Artur
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2018
    Keywords
    spectrally controlled interferometry
    white light interferometry
    coherence
    metrology
    interferometry
    instantaneous
    wavelength shifting
    carrier fringe
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Chase Salsbury and Artur Olszak "Towards instantaneous spectrally controlled interferometry", Proc. SPIE 10749, Interferometry XIX, 107490U (18 August 2018); doi: 10.1117/12.2318896; https://doi.org/10.1117/12.2318896
    Journal
    INTERFEROMETRY XIX
    Rights
    © 2018 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Spectrally controlled interferometry (SCI) is a method which presents a host of advantages over traditional coherent and white light interferometry. As its name suggests, the source spectrum is precisely controlled to produce localized fringes whose location and phase are tunable. The approach has been demonstrated to produce accurate interferometric measurements of planar and spherical optics in the presence of detrimental back reflections over a large range of cavity sizes. Phase shifted measurements of single surfaces can be done without any means of mechanical phase shifting. Additionally, existing systems can be converted to be SCI compatible as the method is implemented entirely at the source level of the instrument. Previous demonstrations of this method have applied temporal phase shifting, but use of the SCI method does not preclude the use of alternative measurement techniques. While traditionally, SCI measurements are acquired by shifting the phase of the spectrum modulation function, here we present an alternative method for phase shifting via mean wavelength shift. It is a convenient extension of SCI because typically source parameters are already controlled electronically and shifting mean wavelength of the source adds no additional complication or modification to the existing hardware. By utilizing wavelength shifting novel architectures for instantaneous measurements become possible. In this paper we present two methods of instantaneous surface measurements: using carrier fringe approach and simultaneous PSI by mean wavelength shift. Various phase measurements of multiple surface cavities via both methods are presented to demonstrate the capability. Comparisons are made to traditional SCI and standard coherent phase shifting measurements. Limitations and sources of noise are addressed as well.
    ISSN
    9781510620698
    9781510620704
    DOI
    10.1117/12.2318896
    10.1117/12.2318896.5836066804001
    Version
    Final published version
    Additional Links
    https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10749/2318896/Towards-instantaneous-spectrally-controlled-interferometry/10.1117/12.2318896.full
    https://www.spiedigitallibrary.org/conference-presentations/10749/107490U/Towards-instantaneous-spectrally-controlled-interferometry/10.1117/12.2318896.5836066804001
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2318896
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