Theoretical study of filter design for UV-bandpass filters for the CETUS probe mission study

U. Brauneck; R. Woodruff; S. Heap; S. Kendrick

doi:10.1117/12.2315049

6 July 2018 Theoretical study of filter design for UV-bandpass filters for the CETUS probe mission study

U. Brauneck, R. Woodruff, S. Heap, S. Kendrick

Proceedings Volume 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray; 106993D (2018) https://doi.org/10.1117/12.2315049
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The importance of high performance interference bandpass filters in the UV is growing recently. For the CETUS project a set of bandpass filters with a clear aperture of 70 mm is required centered at the wavelengths 215.5 nm / 256.5 nm / 297.5 nm / 338.5 nm / 379.5 nm with a FWHM of 41 nm and blocked as good as possible up to 1100 nm. We present a design study based on all-dielectric hard sputtered coatings on colorglass substrates for the wavelengths 297.5 nm / 338.5 nm / 379.5 nm. The colorglass substrates where chosen to suppress ghost images by reflection on the exit face and to improve the blocking in the required range. For the wavelengths 215.5 nm and 256.5 nm a conventionally evaporated design of metal-dielectric Fabry-Perot stacks was chosen on fused silica substrates. We comment on how system requirements are leading to filter specifications and show theoretical spectra of the chosen filter designs.

Citation Download Citation

U. Brauneck, R. Woodruff, S. Heap, and S. Kendrick "Theoretical study of filter design for UV-bandpass filters for the CETUS probe mission study", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106993D (6 July 2018); https://doi.org/10.1117/12.2315049

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