G - Physics – 01 – N
Patent
G - Physics
01
N
358/11.4
G01N 23/207 (2006.01) G21K 1/06 (2006.01)
Patent
CA 1183285
ABSTRACT A crystal diffraction instrument or diffraction grating instrument with an improved crystalline structure or grating spacing structure having a face for receiving a beam of photons or neutrons and diffraction planar spacing or grating spacing along that face with the spacing increasing pro- gressively along the face to provide a decreasing Bragg diffraction angle for a monochromatic radiation and thereby increasing the usable area and acceptance angle. The in- creased planar spacing for the diffraction crystal is pro- vided by the use of a temperature differential across the crystalline structure, by assembling a plurality of crystal- line structures with different compositions, by an individual crystalline structure with a varying composition and thereby a changing planar spacing along its face, and by combinations of these techniques. The increased diffraction grating element spacing is generated during the fabrication of the diffraction grating by controlling the cutting tool that is cutting the grooves or controlling the laser beam, electron beam or ion beam that is exposing the resist layer, etc. It is also possible to vary this variation in grating spacing by applying a thermal gradient to the diffraction grating in much the same manner as is done in the crystal diffraction case.
401037
Meredith & Finlayson
The Government Of The United States As Represented By The United
LandOfFree
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