Laser beam wavelength determination algorithm using a digital micromirror device


An approach for wavelength characterization whereby dynamic Fresnel zone plate (FZP) patterns are written to a digital micromirror device (DMD) and used to focus incoming light onto a camera is proposed. The incoming wavelength is then assessed by scanning the focal length. Rectangular basis Zernike modes are implemented to match the rectangular geometry of the DMD, we believe for the first time. A procedure is developed to correct for inherent aberrations of the optical system by adjusting the Zernike mode amplitudes, thus improving focal spot quality. The aberration corrected FZPs are used to assess the focusing conditions needed for four lasers of different visible wavelengths ranging from blue (405 nm) to near infrared (760 nm). The system is able to produce focused beams with a width of twice the diffraction limit and achieve a wavelength resolution of 3 nm. The operational wavelength of the system is ultimately limited by the spectral bandwidth of the detector.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
Additional Information: Copyright © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI
Publication ISSN: 1560-2303
Last Modified: 11 Jul 2024 07:24
Date Deposited: 28 Jun 2023 15:01
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Related URLs: https://www.spi ... 4101.full?SSO=1 (Publisher URL)
PURE Output Type: Article
Published Date: 2023-06-20
Accepted Date: 2023-06-06
Authors: Zandi, Marie
Benton, David (ORCID Profile 0000-0003-0663-1404)
Sugden, Kate (ORCID Profile 0000-0001-6323-1082)



Version: Published Version

License: Creative Commons Attribution

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