This invention relates to the field of optical technology and provides a short-to-mid-wave
infrared broadband relay imaging
system. Along the
optical path, it sequentially includes a stepped micromirror, a
beam splitter, a compensation plate, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a filter, a
detector window, a cold stop, and a
detector back focal plane. The six lenses are, respectively, a zero-power wedge plate, a positive-power
cylindrical lens, a positive-power binary
diffraction positive
meniscus lens, a negative-power negative
meniscus lens, a negative-power negative
meniscus lens, and a positive-power positive meniscus lens. By combining the wedge plate and the cylindrical mirror, it eliminates large-scale
astigmatism in the
broadband infrared band, achieving
broadband infrared chromatic aberration correction and thermal-free design. It solves the
significant difference in imaging transfer functions between the meridional and sagittal directions of the lens, addresses the problem of reduced
transfer function, and can meet the imaging requirements of the short-to-mid-wave infrared band under complex environmental conditions.