Hemispherical total reflectance from 2 to 25 micron wavelength for vacuum compatible IR black coatings

Paul J. Kuzmenko; Jason G. Zeibel; Quyen Huynh

doi:10.1117/12.2313014

10 July 2018 Hemispherical total reflectance from 2 to 25 micron wavelength for vacuum compatible IR black coatings

Paul J. Kuzmenko, Jason G. Zeibel, Quyen Huynh

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 1070658 (2018) https://doi.org/10.1117/12.2313014
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Black coatings are used in infrared instruments for the suppression of stray and scattered photons. We previously reported on a diamond-like carbon (DLC) coating that exhibited extremely low outgassing for high vacuum applications¹. The nature of the plasma deposition process limits the shapes that can be coated to flat plates or openended tubes. Additionally, the IR reflectivity, though low, is highly specular, which can be problematical in certain situations. We have since examined a number of other surface treatments including paints and electrodeposited coatings using a hemispherical directional reflectometer. Specular and diffuse reflectance is reported as functions of wavelength and incidence angle. Some vacuum considerations will be discussed. We show the application of black coatings to the design of a light trap/air vent.

Citation Download Citation

Paul J. Kuzmenko, Jason G. Zeibel, and Quyen Huynh "Hemispherical total reflectance from 2 to 25 micron wavelength for vacuum compatible IR black coatings", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070658 (10 July 2018); https://doi.org/10.1117/12.2313014

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