Patent ID: 7863570

Claim:
An infrared imaging apparatus, comprising: a dewar, having an internal volume that defines a cold space; an IR transmissive window that seals the cold space to receive IR energy directly from an IR source; a lens located within the cold space to receive IR energy directly from the IR transmissive window, the lens has a first aspheric profile on a first side and a second aspheric profile on a second side, the first side parallel to the second side; an IR detector located within the cold space in operational communication with the lens and positioned coincident to a common focal plane of at least a first and second wavelength of IR energy; an optical stop located within the cold space in front of the lens; and a curved holographic optical element disposed on the second aspheric profile; wherein the lens and the holographic optical element are constructed and arranged to simultaneously color correct energy having said first wavelength from a first waveband of the infrared spectrum and said second wavelength from a second waveband of the infrared spectrum, wherein the first waveband is different from the second waveband, the second wavelength being a harmonic component of the first wavelength, and to focus the color corrected energy onto the common focal plane.