Interleaving of similar thin-film stacks for producing optical interference coatings
First Claim
1. An optical interference coating for reflecting infrared radiation and transmitting visible light comprising:
- one or more interleaved stacks said interleaved stacks comprising a first stack containing three alternating layers of high and low refractive index materials of form (L/a bH L/a), and a second stack containing three alternating layers of high and low refractive index materials of the form (H/a bL H/a)wherein a and b are predetermined values, and a≧
1.75;
and wherein L and H are a low and a high index of refraction material respectively, L and H each being defined as having an optical thickness of a multiple of a quarter-wave of the stack wavelength.
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Accused Products
Abstract
The present invention describes an optical interference coating useful for transmitting visible radiation and reflecting infrared radiation. The coating is formed from a series of interleaved stacks. The interleaved stacks require only two materials, one having a low index of refraction (L) and the second having a high index of refraction (H). The interleaved stack is made from a first stack of the form (L/a bH L/a) and a second stack of the form (H/a bL H/a). The interleaved stack includes one or more of the combined first stack and second stack in the form [(L/a bH L/a) (H/a bL H/a)]. A stack of the form (L/a bH L/a) is placed on one side of the interleaved stacks to achieve symmetry. The complete visible transmitting and infrared reflecting coating is made from two interleaved stack centered at different wavelength and a third quarterwave stack of the form (L/2 H L/2) centered at a third wavelength. Each interleaved stack and quarterwave stack includes one or more layers.
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Citations
6 Claims
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1. An optical interference coating for reflecting infrared radiation and transmitting visible light comprising:
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one or more interleaved stacks said interleaved stacks comprising a first stack containing three alternating layers of high and low refractive index materials of form (L/a bH L/a), and a second stack containing three alternating layers of high and low refractive index materials of the form (H/a bL H/a) wherein a and b are predetermined values, and a≧
1.75;and wherein L and H are a low and a high index of refraction material respectively, L and H each being defined as having an optical thickness of a multiple of a quarter-wave of the stack wavelength. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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- Resources
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Current AssigneeGTE Products Corporation (Ams-Osram AG)
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Original AssigneeGTE Products Corporation (Ams-Osram AG)
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InventorsGasloli, Paul J.
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Primary Examiner(s)Arnold, Bruce Y.
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Assistant Examiner(s)PARSONS, DAVID
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Application NumberUS07/787,855Time in Patent Office434 DaysField of Search359/359, 359/360, 359/350, 359/588, 359/589US Class Current359/359CPC Class CodesG02B 5/282 reflecting for infrared and...
