Experimental investigation on environmental durability of protected-silver mirrors

Xu Xu; Wang Hang; Xiong Tao

doi:10.1117/12.2622365

27 March 2022 Experimental investigation on environmental durability of protected-silver mirrors

Xu Xu, Wang Hang, Xiong Tao

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121691P (2022) https://doi.org/10.1117/12.2622365
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Silver-based high-reflective mirrors are widely used in optical applications such as large-aperture astronomical telescopes and spaced-based optics. The long-term stability of silver-based mirrors is of great importance to these applications. The development of more durable silver-based mirrors has been a hot topic in the optical coating community. In this paper, corrosion mechanisms of the protected-silver mirrors with a Sub/NiCrN_x/Ag/NiCrN_x/SiN_x/Air structure were investigated in details. The corrosion features of a single layer Ag sample, which exposed to atmospheric environment for a few days, are observed by a Zeta-500 3D optical microscope. The durability of protected-silver mirrors with a structure of Sub/NiCrN_x/Ag/NiCrN_x/SiN_x/Air is evaluated by accelerated environmental tests, including 360-hour salt fog test and humidity test. A transmittance measurement setup at the wavelength of 632.8 nm and a Perkin-Elmer Lambda 1050 spectrophotometer are used to monitor the transmittance and reflectance evolutions during the accelerated environmental tests. A Zeta-500 3D optical microscope is employed to analyze the corrosion features of the protected-silver mirrors after 360-hour accelerated environmental tests. X-ray diffractometer (XRD) is employed to analyze the microstructure before and after 360-hour accelerated environmental tests. Based on the experimental results, the potential corrosion mechanisms of the protected-silver mirrors were discussed in-depth. Furthermore, it was demonstrated that the transmittance evolution, which represents the pinhole density and therefore the degree of corrosion of the protected-silver mirrors, is valuable to evaluate the durability of silver-based mirrors.

Citation Download Citation

Xu Xu, Wang Hang, and Xiong Tao "Experimental investigation on environmental durability of protected-silver mirrors", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121691P (27 March 2022); https://doi.org/10.1117/12.2622365

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Mirrors

Corrosion

Silver

Fiber optic gyroscopes

Humidity

Transmittance

Reflectivity

Show All Keywords

Keywords/Phrases

Search In:

Publication Years