Patent ID: 8792170
Filing Date: 2014-07-29
Classification: G02B

Abstract:
1. An imaging device comprising: receiver optics for receiving and focusing radiation emanating from a scene, said radiation comprising a first wavelength selected from a first spectral band, and further comprising a second spectral band, wherein said first wavelength is substantially a multiplicative factor less than the midpoint of said second spectral band; a diffractive and focusing surface, optically coupled with said receiver optics, wherein said diffractive and focusing surface diffracts said first wavelength received from said receiver optics at an order of diffraction substantially equal to said multiplicative factor, and further diffracts said second spectral band received from said receiver optics at a first order of diffraction; a first diffractive and focusing arrangement, optically coupled with said diffractive and focusing surface, wherein said first diffractive and focusing arrangement diffracts said first wavelength received from said diffractive and focusing surface at a first order of diffraction, and further diffracts said second spectral band received from said diffractive and focusing surface at a zeroth order of diffraction, and a second diffractive and focusing arrangement, optically coupled with said first diffractive and focusing arrangement, wherein said second diffractive and focusing arrangement diffracts said first wavelength received from said first diffractive and focusing arrangement at a first order of diffraction, and further diffracts said second spectral band received from said first diffractive and focusing arrangement at a zeroth order of diffraction, such that said first wavelength and second spectral band emanating from said second diffractive and focusing arrangement focuses at a substantially common focal length along an optical axis, and at a substantially common focal plane width perpendicular to said optical axis, producing a final image with substantially no longitudinal chromatic aberration and substantially no transverse chromatic aberration.