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Proceedings Paper

Thorium-free antireflection coatings for domes and windows
Author(s): Hoa T. Bui; Wasim Hasan
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Paper Abstract

Thorium fluoride ThF4 has been used over the last several decades as a low index coating material for many optical applications such as in anti-reflection (AR) coatings, high reflective coating, beam splitters, coating dichroics and optical filters. ThF4 has excellent optical and mechanical properties but unfortunately is slightly radioactive. New guidelines from many government agencies require that ThF4 shall not be used as coating material for safety reasons. Also new stringent requirements on the disposal of radioactive material in many states within the USA have made it economically difficult to use. This paper therefore deals with AR coatings which do not have radioactive materials in them. Three types of coatings based on applications have been discussed in this paper. These are namely (1) AR coatings for long wavelength infrared region (LWIR), (2) AR coatings for 1.06 micrometer and long wavelength infrared regions (LWIR), and (3) AR coatings for multiple wavelength regions namely VIS/NIR/MWIR (medium wavelength infrared region) and VIS/NIR/MWIR and LWIR. The spectral performance, mechanical and environmental durability, and rain-erosion test data is presented in this paper.

Paper Details

Date Published: 27 June 1997
PDF: 6 pages
Proc. SPIE 3060, Window and Dome Technologies and Materials V, (27 June 1997); doi: 10.1117/12.277045
Show Author Affiliations
Hoa T. Bui, Hughes Danbury Optical Systems, Inc. (United States)
Wasim Hasan, Hughes Danbury Optical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 3060:
Window and Dome Technologies and Materials V
Randal W. Tustison, Editor(s)

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