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AssigneeJapan Atomic Energy Research Insititute
InventorsMasato Koike, Kazuo Sano, Yoshihisa Harada
Estimating the term…
An x-y coordinate is set on the surface of diffraction grating 3 with non-uniformly spaced grooves and expressed by the following series expansion which is a groove function describing a point (w,l) on the nth groove from the origin: 1 n = 1 σ ∑ i , j n i j w i l j ( i + j ≥ 1 ) The focal length (r0′) and the expansion coefficient nij in this series expansion are so determined that all expanded terms Fij in the following optical path function are zero at a desired wavelength: 2 F = ∑ i , j F i j w i l j = ∑ i , j [ M i j + ( m λ σ ) n i j ] w i l j ( i + j > 0 ) the optical path being for the light that passes through entrance slit 1 to be reflected by concave mirror 2 and diffracted at a point (w,l) on the surface of diffraction grating 3 before it reaches exit slit 4. The positions of two point light sources C5 and D6 in a holographic recording system are so determined as to realize the required value of nij.
A conical diffracting grazig incidence spectroscope comprising convergent light generating means which causes divergent light from a light source or through an entrance slit to be converted into convergent light and a diffraction grating positioned on an optical path from said light source to the focal point of said convergent light, said spectrometer performing wavelength scanning by rotating said diffraction grating about an axis set parallel to the grooves in the grating surface, wherein the axis of rotation of the diffraction grating, the incident principal ray and the diffracted principal ray are all in the same plane.
Dependencies are inferred from the claim text.