Claims
- 1. Apparatus to generate radiation comprising; means to generate a beam of electrons; a diffraction grating generally adjacent the path of said electron beam; and a reflector means cooperating with said diffraction grating to set up a standing electromagnetic wave pattern through which the electron beam passes; wherein said reflector means comprises substantially only dielectric materials.
- 2. Apparatus as in claim 1, wherein said reflector means comprises a dielectric base member having selected dielectric coatings thereon.
- 3. Apparatus as in claim 2, wherein the coatings are so chosen as to reflect radiation of a selected wavelength.
- 4. Apparatus as in claim 3, wherein said coatings comprise alternate layers of differing dielectric materials, the thickness of each of said layers being substantially equal to one-fourth of said selected wavelength in the respective dielectric medium.
- 5. Apparatus as in claim 2, further comprising output means for radiation generated by said apparatus, said output means comprising a dielectric waveguide.
- 6. Apparatus as in claim 5, wherein said dielectric waveguide is operatively connected to the base of said reflector means, a portion of said base member adjacent said waveguide being free of said coatings.
- 7. Apparatus as in claim 1, wherein said diffraction grating is embedded in a dielectric base having a surface highly reflective of radiation of a selected wavelength.
- 8. Apparatus as in claim 7, wherein said surface comprises alternate layers of differing dielectric materials, the thickness of each of said layers being substantially equal to one-fourth of said selected wavelength in the respective dielectric medium.
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without payment to use of any royalties thereon.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2634372 |
Salisbury |
Apr 1953 |
|
4074211 |
Bates |
Feb 1978 |
|
Non-Patent Literature Citations (2)
Entry |
Born et al., Principles of Optics, 5th edition, Pergamon Press, Oxford, 1, pp. 66-70. |
Culshaw, Proc. Phys. Soc. 66B, 1953, pp. 597-608 "The Fabry-Perot Interferometer at Millimetre Wavelengths". |