Method and apparatus for filter infrared emission

Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector

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359350, 359589, 136257, 250504R, G02B 508, G02B 528

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active

057267987

ABSTRACT:
A method and apparatus are provided for emitting a laser like monochromatic narrow beam of light at a selected wavelength from a heated emitter member having a plurality of parallel layers while reducing emission at other wavelengths of light. The parallel layers are overlaid with each other. Each of the parallel layers extends transversely for a particular width. A heat source stimulates the emitter member to emit photons, which are determined by the composition of materials within the emitter member. The emitter member emits monochromatic light at a selected wavelength in response to the photon emissions. The selected wavelength of the monochromatic light is determined by the width of the layers of the emitter member. Light at other wavelengths does not transmit through and their emissivity also decreases. A preferred embodiment of the present invention has an emitter member with the parallel layers having a width of one-quarter of the selected wavelength, which is within the infrared portion of the light spectrum.

REFERENCES:
patent: 3523179 (1970-08-01), Edwards et al.
Oriel Corporation, "Optics and Filters", vol. 111 Catalog, 1990.

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