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Optical Engineering

Measured optical performance of three Fabry-Perot interferometers for use in a tunable ultraviolet filter
Author(s): Clarence M. Korendyke; Dennis George Socker
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Paper Abstract

A narrowband ultraviolet (UV) filter would allow the first monochromatic two-dimensional images of astrophysical plasmas to be obtained in UV emission lines. The high etendue and spectral resolving power of the Fabry-Perot (FP) interferometer make it an excellent candidate for use in a tunable UV filter, provided that adequate optical performance can be obtained. Laboratory measurements of three UV FP interferometers with progressively greater dielectric mirror reflectances are described. The measurements demonstrate the adequate reflectivity, absorption, and small-scale smoothness of currently available coatings and substrates for UV interferometry. The measurements are conducted at 228.8 nm utilizing a cadmium hollow cathode light source. The best performing interferometer has a finesse of 41 and maximum transmittance of 0.38 over a coating-performance-dominated 3-mm-diam subaperture and a finesse of 26 and maximum transmittance of 0.32 over a parabolic-defect-dominated 30-mm-diam aperture. This interferometer is well suited for use in a UV filter system.

Paper Details

Date Published: 1 September 1993
PDF: 5 pages
Opt. Eng. 32(9) doi: 10.1117/12.145387
Published in: Optical Engineering Volume 32, Issue 9
Show Author Affiliations
Clarence M. Korendyke, Naval Research Lab. (United States)
Dennis George Socker, Naval Research Lab. (United States)

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