High-aperture low-coherence interferometer with a diffraction reference wave

A high-aperture low-coherence interferometer with a diffraction reference wave based on a tipped single-mode optical fiber was proposed and investigated. Due to the usage of the central least-aberrated region of the diffracted wavefront, the interferometer comprise record working aperture among know...

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Bibliographic Details
Published in:Optics letters 2022-07, Vol.47 (14), p.3459-3462
Main Authors: Toropov, Mikhail, Chkhalo, Nikolay, Malyshev, Ilya, Salashchenko, Nikolay
Format: Article
Language:English
Subjects:
Apertures
Interferometers
Low coherence interferometry
Optical fibers
Reproducibility
Wave diffraction
Wave fronts
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Summary:A high-aperture low-coherence interferometer with a diffraction reference wave based on a tipped single-mode optical fiber was proposed and investigated. Due to the usage of the central least-aberrated region of the diffracted wavefront, the interferometer comprise record working aperture among known PDIs. The interferometer makes it possible to study samples with a reflectance that varies over a wide range. A demonstration of the use of this interferometer for high-precision measurements of a spherical mirror is presented. Sub-nanometer reproducibility of measurements in terms of the peak to valley (PV) parameter and sub-angstrom reproducibility in terms of the rms are demonstrated.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.460708