Broadband Variable Transmission Sphere for Fizeau Interferometry

Transmission spheres used in interferometry are specified by f-number and source wavelength. In this paper, we explore a broadband variable transmission sphere (BVTS) system based on freeform Alvarez lenses that enables variable operation across a broad range of f-numbers and wavelengths. Potential...

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Bibliographic Details
Published inOptics Vol. 3; no. 1; pp. 88 - 98
Main Authors Koerber, Jonathan, Boreman, Glenn D., Suleski, Thomas J.
Format Journal Article
LanguageEnglish
Published Siegen MDPI AG 01.03.2022
Subjects
Alvarez lens
broadband
Design
freeform optics
Interferometry
Optimization
Sensors
Spheres
variable transmission sphere
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Summary:Transmission spheres used in interferometry are specified by f-number and source wavelength. In this paper, we explore a broadband variable transmission sphere (BVTS) system based on freeform Alvarez lenses that enables variable operation across a broad range of f-numbers and wavelengths. Potential applications and performance tradeoffs are discussed in comparison to conventional spherical transmission spheres. Simulation results are presented for f/15 to f/80 configurations from visible to long-wave infrared sources in a Fizeau interferometer. Simulation results highlight that spherical, coma, and astigmatism impose limits on surface measurement quality.
ISSN:2673-3269
2673-3269
DOI:10.3390/opt3010011