Patent ID: 6999231

Claim:
A multi-spectral objective lens comprising: a primary lens for receiving light in the short wave infrared and long wave infrared spectral bands; a prism that receives the light from the primary lens, the prism being formed of a first half cube and a second half cube, which when put together form a 45° angle face; wherein the first half cube is coated along the 45° angle face with a first coating that is a long wave infrared/short wave infrared splitting coating and the second half cube has a powered, reflective back surface and is coated along the 45° angle face with second coating that is a polarization-sensitive short wave infrared coating, which allows for transmission of short wave infrared light in one direction and reflection of short wave infrared light in the opposite direction; wherein the prism transmits short wave infrared light through the 45° angle face and the short wave infrared light reflects on the second half cube's back surface to the 45° angle face which reflects the short wave infrared light again out to a powered top surface of the prism to a short wave infrared channel; and wherein the first coating of the first cube reflects long wave infrared light to a long wave infrared channel; the short wave infrared channel being powered for aberration correction; and the long wave infrared channel having a plurality of lens that provide chromatic aberration correction and field angle correction.