Reflectivity

Laser Gold plating reflectivity is greater than 99% at 10.6 microns and greater than 97% at 0.7 microns when measured on a low-scatter substrate, measured at 6 degrees angle of incidence. The reflectivity in the infrared equals and often exceeds that of a freshly vapor-deposited gold. Because of its outstanding cleanability, stability and reflectivity, in 1984, the National Bureau of Standards, (NIST), chose Laser Gold plating as the Standard IR reference material (#2011). For more than twenty years, Epner Technology had been the sole source supplier of these standards.

Zinc Selenide Gold Plated Mirror Spectral Reflection Measurements
Epner Technology received Optical Grade Zinc Selenide samples for Laser Gold.  The mirrors have a surface quality of 60/40 scratch/dig (both sides), a flatness of < 3 waves @ 633nm (both sides), an RA of <10nm and a wedge of < 5 arc minutes.  The data are all relative reflection measurements vs. the internal gold mirror piece.  Tests were performed at different times with individual atmospheric and energy background.  An error margin of approximately +/- 1% should be applied.
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By University of Reading
Laser Gold Spectral Reflectance Graphical Data
Reflectivity

This reflectance chart depicts measurements made by three separate organizations, China Lake Naval Weapons Center, (measurement made under the renowned Jean Bennett), Hughes Aircraft’s Optics Lab, then in Culver City, Ca. and AZ Technology, a NASA source in Huntsville.  In all cases, the measurements were made with the Laser Gold plated over a highly polished, low scatter electroless nickel substrate.  At 700nm wavelength reflectivity is an astounding 97% and >99% @10 microns.  Measured at 6 degrees angle of incidence.
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Laser Gold Spectral Reflectance Tabular Data
By AZ TECHNOLOGY
Hemispherical Reflectance of Laser Gold
The first test of the coating was to determine the solar absorptance and the directional hemispherical spectral reflectance from 250nm-2800nm.  AZ Technology specifically designed and built the Laboratory Portable SpectroReflectometer (LPSR-200IR) to perform such measurements.  The LPSR-200IR measures the directional hemispherical spectral reflectance of the sample at 100 wavelengths in less than two minutes from 250nm-2800nm and from this data calculates the solar absorptance.
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By AZ TECHNOLOGY
Hemispherical Directional Reflectance on Specular Au
Phi_i Orientation: 0.0ºData Points:  191Spectral Range: 500 to 2500 nanometersReflectance Units:  % Reflectance Data Type:  Hemispherical Directional Reflectance General Description:  Specular Au (Epner Sample #2) Unpolarized
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By Surface Optics Corporation
Specular Gold Directional Reflectance at 20 Degrees Incidence
 Wavelength: 400 – 2600 nanometers
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By Surface Optics Corporation
Spectral Reflectivity of Epner’s Laser Gold

Almost everyone who attends the SPIE DSS Exposition has received a gold-plated paper clip from Mr. David Epner, personally. Well, the gold costing that Epner supplies to the optics industry has some interesting infrared reflectance (and emittance) properties…
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By Temperatures.com, Inc.
IMR Laser Gold Test Report
At IMR Test Labs in Lansing, NY, six samples were tested, three  from Epner Technology, Inc. and three samples from an unidentified competitor (provided by L3 Communications), calculating the Hemispherical Directional Reflectance measurements.  The samples were sent out, first to be environmentally tested in a humidity chamber (exposed to 120°F at 95% for 24 hours), then sent back out for reflectivity testing.
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By IMR Test Labs
Spectroscopic Ellipsometry Analysis of Opaque Gold Film
Ron Synowicki, with J.A. Woollam, Co., Inc., measured the optical n & k properties of our Laser Gold plating using spectroscopic ellipsometry.
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