Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1991-11-05
1993-01-12
Arnold, Bruce Y.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359588, 359589, G02B 528, F21V 904
Patent
active
051794683
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.
REFERENCES:
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patent: 3853386 (1974-12-01), Ritter et al.
patent: 4854670 (1989-08-01), Mellor
patent: 4931315 (1990-06-01), Mellor
L. I. Epstein, "The Design of Optical Filters" Journal of the Optical Society of America, vol. 42, No. 11, pp. 806-810, Nov. 1952.
H. A. Macleod Thin Film Optical Filters, Macmillan Publishing Company, New York, 1986, pp. 191-198.
Arnold Bruce Y.
Craig Frances P.
GTE Products Corporation
Parsons David R.
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