Abstract: An optical system a plurality of lenses, arranged within a same optical path, configured to simultaneously pass and focus therethrough short-wave infrared (SWIR) and mid-wave infrared (MWIR) spectral bands to a common focal plane and provide simultaneous correction of monochromatic and chromatic aberrations over the SWIR and MWIR spectral bands is disclosed. Another system and a method are also disclosed.

Abstract: A reflecting prism has an input surface, an output surface, a first reflection surface, a second reflection surface, and a third reflection surface. The reflecting prism has a first refractive index, such that the first, second, and third reflection surfaces interface with an external medium having a second refractive index less than the first refractive index. This interface defines a critical angle for total internal reflection for each of the first, second, and third reflection surfaces. Light is received at the input surface of a prism body of a reflecting prism and is transmitted along a first internal optical path segment of an optical path to the first reflection surface. The angle of incidence of the first internal optical path segment with respect to the first reflection surface is greater than the critical angle for the first reflection surface, thereby causing the light to be reflected via total internal reflection.