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Lamp method and apparatus using multiple reflections

United States Patent

June 12, 2001
View the Complete Patent at the US Patent & Trademark Office
An electrodeless microwave discharge lamp includes an envelope with a discharge forming fill disposed therein which emits light, the fill being capable of absorbing light at one wavelength and re-emitting the absorbed light at a different wavelength, the light emitted from the fill having a first spectral power distribution in the absence of reflection of light back into the fill, a source of microwave energy coupled to the fill to excite the fill and cause the fill to emit light, and a reflector disposed within the microwave cavity and configured to reflect at least some of the light emitted by the fill back into the fill while allowing some light to exit, the exiting light having a second spectral power distribution with proportionately more light in the visible region as compared to the first spectral power distribution, wherein the light re-emitted by the fill is shifted in wavelength with respect to the absorbed light and the magnitude of the shift is in relation to an effective optical path length.
MacLennan; Donald A. (Gaithersburg, MD), Turner; Brian P. (Damascus, MD)
Fusion Lighting, Inc. (Rockville, MD)
09/ 309,272
May 11, 1999
This invention was made with Government Support under Contract No. DE-FG01-95EE23796 awarded by the Department of Energy. The Government has certain rights in this invention.