DICHROIC GLASS

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Dichroic Glass Coatings

Stock Size:

48" x 48" x 1/4" Float Glass
48" x 48" x 1/8" Float Glass
48" x 48" x 3/16" Float Glass

Capabilities:

• Engineering is available for certain materials with odd sizes and shapes.
• Variation on size, color and material.
• Sizes larger than 48" x 48" (stock size) are available by modifications and additional fixture and engineering.

Scope:

These specifications apply to the coatings when they are applied to glass with an index of refraction of 1.523. For custom applications, transmission and reflectivity tolerances and wavelength considerations can be specifically tailored to customer's requirements.

Materials and Workmanship:

The coating process shall cause no injury to the glass surface which would cause rejection of the optical element under other applicable specifications. Any optical element which has met the requirements of other applicable specifications prior to coating shall not be rejected after coating because of fine hair lines or other defects in such optical elements which are made more visible by the coating. The coating shall have substantially low absorption of visible light.

Reflection:

The coated element shall reflect from the front surface at least 90% of the incident light at the specified wavelength which includes a tolerance of +/-10 millimicrons. Our capabilities range from 90% reflectivity up to 99% at the specified wavelengths. Representative spectrophotometric curves for our standard coatings are shown.

Adherence:

No visible part of the coating shall be removed by the cellulose tape test described here:
Tape Test: The tacky surface of cellulose tape shall be carefully placed in contact with a portion of the coated surface and firmly rubbed against the surface. It shall then be quickly removed with a snap action that exerts the greatest stripping action on the mirror film.

Durability:

No evidence of film deterioration visible to the eye shall result from one of both of the following tests.

The coated element shall be placed in a thermostatically controlled cabinet with a salt atmosphere at a temperature of 95° F for 48 hours. The salt atmosphere shall be obtained by allowing a stream of air to bubble through a salt solution containing about 1 1/2 pounds of sodium chloride per cubic ft. of water.

The coated element shall be placed in a thermostatically controlled humidity cabinet with an atmosphere of at least 95% relative humidity and at a temperature of 120° F +/- 4° F for a continuous period of 24 hours.

Hardness:

No evidence of film removal of film abrasion shall be visible to the eye when any one or all the following tests are applied:

• The coated optical element shall be carefully washed first in a solution consisting of one ounce of sulfate alcohol, one ounce of 15 Baume normal ammonium hydroxide and one gallon water; then cleaned in acetone or grain alcohol and dried with lens tissue or soft cloth. The temperature shall not exceed 80° F.
• A thick paste of U.S.P. precipitated chalk and water shall be applied to the coating and allowed to dry and then wiped with soft cloth.
• A pad of clean, dry cheese cloth (previously laundered) 3/8" in diameter, 1/2" thick, bearing with a force of one pound on the coating shall be rubbed across the coated element in any direction 150 times.
• NOTE: During the above tests, care should be exercised to prevent contaminating abrasives contacting the coated surface causing slight sleeks.

Water Resistance:

No evidence of film deterioration visible to the eye shall result from the following test: A drop of (0.05 milliliter) of distilled water shall be permitted to dry at room temperature on the coated surface and the coated surface shall then be cleaned with acetone or grain alcohol.

Effect of Temperature:

The coating shall function satisfactorily and shall not be damaged by exposure to an ambient temperature of 60° F and +500° F.