Reflector for transmission of a desired band of wavelengths of electromagnetic radiation
First Claim
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1. A reflector having a concave cavity, comprising:
- an absorptive layer disposed on the concave cavity;
a reflective filter coating disposed on the absorptive layer adapted to reflect a band of wavelengths and to transmit wavelengths outside of the band of wavelengths;
a window including an optical coating comprising a short-wave filter in optical series with a long-wave filter, said optical coating comprising dielectric layers; and
additional dielectric layers in said optical coating configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between said short-wave and long-wave filters.
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Abstract
A cool light source includes a reflector having a band-reject reflective coating and an underlying absorptive coating. The cool light source also includes a window with a band-pass transmission function that is substantially complimentary to the band-reject reflective coating.
27 Citations
27 Claims
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1. A reflector having a concave cavity, comprising:
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an absorptive layer disposed on the concave cavity; a reflective filter coating disposed on the absorptive layer adapted to reflect a band of wavelengths and to transmit wavelengths outside of the band of wavelengths; a window including an optical coating comprising a short-wave filter in optical series with a long-wave filter, said optical coating comprising dielectric layers; and additional dielectric layers in said optical coating configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between said short-wave and long-wave filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A reflector, comprising:
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an optical cavity including a means for convectively removing heat; an absorptive layer disposed in the optical cavity; a reflective filter; and a decoupling layer disposed between the absorptive layer and reflective filter; said reflective filter comprising means for reflecting a set of desired wavelengths, and said absorptive layer comprising means for absorbing at least partially a set of undesired wavelengths and converting the undesired wavelengths to heat; and means for transmitting the set of desired wavelengths from the optical cavity including means for reflecting substantially the set of undesired wavelengths back to the means for absorbing, in which the means for transmitting includes a means for reflecting a set of short-wavelengths in optical series with a means for reflecting a set of long-wavelengths, and a number of additional dielectric layers interposed between said means for reflecting a set of short-wavelengths and said means for reflecting a set of long-wavelengths configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between said means for reflecting a set of short-wavelengths and said means for reflecting a set of long-wavelengths. - View Dependent Claims (15)
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16. A projection system, comprising:
a cool light source having, an electromagnetic radiator capable of creating a set of desired wavelengths and a set of undesired wavelengths, a reflector having a reflective coating configured to reflect substantially the set of desired wavelengths and at least partially absorb the set of undesired wavelengths, and a window having a set of dielectric coatings comprising a short-wave filter in optical series with a long-wave filter configured to transmit substantially the set of desired wavelengths and reflect substantially the set of undesired wavelengths back to the reflective coating and additional dielectric layers in said coatings configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between said short-wave and long-wave filters; and a light modulator assembly optically coupled to the cool light source. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method of making a cool light source, comprising:
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creating a set of desired wavelengths and a set of undesired wavelengths of electromagnetic radiation; reflecting substantially the set of desired wavelengths, absorbing at least partially the set of undesired wavelengths, and reflecting any remaining set of the undesired wavelengths off of a first reflective surface; and reflecting substantially the set of undesired wavelengths with a second reflective surface back to the first reflective surface and transmitting the set of desired wavelengths through the second reflective surface including forming the second reflective surface from a short-wave pass filter in optical series with a long-wave pass filter, both said filters being disposed on a same side of a window that comprises said second reflective surface and applying a number of additional dielectric layers interposed between said short-wave pass filter and long-wave pass filter configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between the short-wave and long-wave filters. - View Dependent Claims (24, 25)
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26. The method of making a cool light source, comprising:
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creating a reflector cavity within a heat conducting substrate; applying an absorptive coating on the reflector cavity; applying a first reflective coating on the absorptive coating that reflects a first set of wavelengths and transmits a second set of wavelengths; applying a second reflective coating on a window that transmits the first set of wavelengths and reflects the second set of wavelengths to create a reflector window; and applying the reflector window to at least partially enclose the reflector cavity, in which applying the second reflective coating on a window includes applying a first set of dielectric coatings that transmit the first set of wavelengths and reflects a first subset of the second set of wavelengths and applying a second set of dielectric coatings that transmit the first set of wavelengths and reflects a second subset of the second set of wavelengths, and applying a number of additional dielectric layers interposed between the first set of dielectric coatings and the second set of dielectric coatings configured to reduce reflectance loss due to air and window interface index mismatch and for phase matching between the first set of dielectric coatings and the second set of dielectric coatings. - View Dependent Claims (27)
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Specification