Electric lamp and discharge devices – Photosensitive – Photocathode
Patent
1992-05-26
1994-05-10
Yusko, Donald J.
Electric lamp and discharge devices
Photosensitive
Photocathode
313110, 313539, 313527, 2502141, H01J 134, H01J 4308
Patent
active
053110986
ABSTRACT:
An interference photocathode includes a reflective substrate and interference layers disposed on said reflective substrate for selectively enhancing a first photoelectric yield of said photocathode when irradiated by radiation having a first wavelength relative to a second photoelectric yield of said photocathode when irradiated by radiation having a second wavelength. In one embodiment, the interference layers include a dielectric layer having a wavelength dependent effective thickness disposed on said reflective substrate such that said effective thickness for radiation having said first wavelength is an odd multiple of a quarter of said first wavelength and said effective thickness for radiation having said second wavelength is an even multiple of a quarter of said second wavelength. In another embodiment, the dielectric layer includes a layer of electrically conductive material and a dielectric material disposed between said layer of electrically conductive material and said reflective substrate.
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J. F. Seely et al., "Thin-Film Interference Optics for Imaging the O II 834 Airglow and Rejection of 1216 A Radiation," SPIE vol. 1546 Multilayer and Grazing IncidenceX-Ray/EUV Optics Jul. 1991.
J. F. Seely et al., "Thin FIlm Interference Optics for Imaging the O II 834-A Airglow," Applied Optics, 30, 2788 (No. 19, Jul. 1, 1991).
Greorg Hass, "Physics df thin films", vol. 1, Academic Press, 1963.
Hunter William R.
Seely John F.
McDonnell Thomas E.
Miles Edward F.
Patel Nimesh
The United States of America as represented by the Secretary of
Yusko Donald J.
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