Patent ID: 8885161

Claim:
An energy dispersion device, comprising: a limiting aperture; a collimating optic; and a wavelength dispersion component, wherein: said limiting aperture is positioned at the optical focus point of said collimating optic; said limiting aperture admits electromagnetic radiation incident on said collimating optic; said collimation optic collimates said electromagnetic radiation to be incident on said wavelength dispersion component; said wavelength dispersion component comprises a stack comprising two or more diffraction gratings; wherein each diffraction grating in said stack is selected from the group consisting of single-dispersion diffraction gratings and double-dispersion diffraction gratings; wherein each diffraction grating in said stack is about coplanar with each other diffraction grating in said stack; and wherein each diffraction grating in said stack is rotated about its normal such that it is rotated relative to each other diffraction grating in said stack; and said wavelength dispersion component diffracts said electromagnetic radiation into a multiplicity of diffraction orders.