Flat field schmidt telescope with extended field of view

摘要

Various embodiments provide a flat field Schmidt-type telescope including a spherical primary mirror, an aspheric correcting plate spaced apart from the primary mirror, a detector disposed between the primary mirror and the corrector plate, and a field lens disposed between the primary mirror and the detector. The field lens is configured to reshape a curved field plane formed by the primary mirror into a flat field plane. A material of the field lens is selected to transmit in the infrared wavelength range (e.g., SWIR and/or MWIR) and is selected to have a desired refractive index so as to achieve a field of view (FOV) of the telescope greater than approximately 10 degrees.