Absorptance characteristics of silver and silver-on-copper mirrors

Journal Article · Mon Jun 15 00:00:00 EDT 1987 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.26.002450· OSTI ID:6512046

Kimura, W D

Glancing incidence absorptance measurements are performed on bare silver and bare silver with a copper underlayer mirrors. Measurements are at a laser wavelength of 0.5145 ..mu..m, angles of incidence from 0 to 89/sup 0/, at both s and p polarizations. The increase in absorptance as a result of the mirrors tarnishing naturally in room air is measured over a period of 60 days. New and untarnished, the silver/copper mirror tends to have a higher absorptance at all angles of incidence compared with the silver mirror. Once exposed to room air the silver/copper mirror absorptance at normal incidence does not increase as rapidly over time as the silver mirror, which seems to indicate a greater resistance to tarnishing. However, at glancing incidence both mirrors appear to have similar tarnishing rates. After 60 days the absorptance of the silver/copper mirror has a lower absorptance at normal incidence than the silver mirror, but at glancing angles of incidence both tarnished mirrors have comparable absorptance values.

• Research Organization: Spectra Technology, Inc., 2755 Northup Way, Bellevue, Washington 98004
• OSTI ID: 6512046
• Journal Information: Appl. Opt.; (United States), Vol. 26:12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
REFLECTIVITY
MIRRORS
PERFORMANCE TESTING
SILVER
ABSORPTIVITY
INCIDENCE ANGLE
LASER MIRRORS
OPTICAL PROPERTIES
POLARIZATION
SPECTRAL REFLECTANCE
SUBSTRATES
WAVELENGTHS
ELEMENTS
METALS
PHYSICAL PROPERTIES
SURFACE PROPERTIES
TESTING
TRANSITION ELEMENTS
360104* - Metals & Alloys- Physical Properties