Enhanced aluminum reflecting and solar-blind filter coatings for the far-ultraviolet | Zendy

Javier Del Hoyo | Zendy; Manuel A. Quijada | Zendy

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Enhanced aluminum reflecting and solar-blind filter coatings for the far-ultraviolet

Author(s) -

Javier Del Hoyo,

Manuel A. Quijada

Publication year - 2017

Publication title -

nasa sti repository (national aeronautics and space administration)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.1117/12.2274399

Subject(s) - materials science , optical coating , transmittance , magnesium fluoride , ultraviolet , thin film , optical filter , optics , optoelectronics , aluminium , absorption (acoustics) , coating , deposition (geology) , layer (electronics) , nanotechnology , composite material , physics , paleontology , sediment , biology

The advancement of far-ultraviolet (FUV) coatings is essential to meet the specified throughput requirements of the Large UV/Optical/IR (LUVOIR) Surveyor Observatory which will cover wavelengths down to the 100 nm range. The biggest constraint in the optical thin film coating design is attenuation in the Lyman-Alpha Ultraviolet range of 100-130 nm in which conventionally deposited thin film materials used in this spectral region (e.g., aluminum [Al] protected with Magnesium fluoride [MgF2]) often have high absorption and scatter properties degrading the throughput in an optical system. We investigate the use of optimally deposited aluminum and aluminum tri-fluoride (AlF3) materials for reflecting and solar blind band-pass filter coatings for use in the FUV. Optical characterization of the deposited designs has been performed using UV spectrometry. The optical thin film design and optimal deposition conditions to produce superior reflectance and transmittance using Al and AlF3 are presented.

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