Glancing incidence measurements of diamond turned copper mirrors
The absorptance characteristics of diamond turned copper mirrors are measured at angles of incidence from 0 to 87/sup 0/. The measurements are performed at 1.06 ..mu..m for both s and p polarization and for the diamond turned grooves on the mirror surface oriented either perpendicular or parallel to the plane of incidence. To first order, the absorptances tend to follow the theoretical curves predicted by the Fresnel equations for flat bare metal surfaces. However, at glancing incidence, the Fresnel equations tend to have difficulty accurately predicting the experimental results. When the grooves are oriented perpendicular to the plane incidence the measured absorptance for s-polarized light is significantly higher than that predicted by theory; whereas the absorptance is slightly lower than theory when the grooves are parallel to the plane of incidence. Possible explanations for the observed absorptance behavior are discussed.
- Research Organization:
- Spectra Technology, Inc., 2755 Northup Way, Bellevue, Washington 98004
- OSTI ID:
- 6884217
- Journal Information:
- Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 26:4; ISSN APOPA
- Country of Publication:
- United States
- Language:
- English
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47 OTHER INSTRUMENTATION
COPPER
CORRELATIONS
ELEMENTS
INCIDENCE ANGLE
LAWRENCE LIVERMORE LABORATORY
MANUFACTURING
METALS
MIRRORS
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OPTICAL PROPERTIES
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POLARIZATION
REFLECTIVITY
RESEARCH PROGRAMS
SPECTRAL REFLECTANCE
SURFACE PROPERTIES
TESTING
TRANSITION ELEMENTS
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