The invention discloses a spatial
light beam compression multichannel imaging optical
system with a
large field of view. The
system comprises an off-axis three-mirror
light beam compression afocal telescopic
system, a second replicating mirror (5), a first color separation filter (6), a second color separation filter (7), a visible and near
infrared relay lens group (8), a visible and near
infrared focal plane device (9), a short wave
relay lens group (10), a short wave focal plane device (11), a long wave
relay lens group (12) and a long wave focal plane device (13), wherein the afocal off-axis three-mirror
light beam compression optical system comprises a
primary mirror (1), a
secondary mirror (2), a first replicating mirror (3) and a third mirror (4). A target radiating light beam is compressed by the afocal off-axis three-mirror light beam compression optical system, emergent parallel light beams pass through the color separation filters and enter following visible and near
infrared channel,
medium wave channel and
long wave infrared channel, and images are formed on focal planes of the channels by the
relay lens groups of the channels. The optical system has the advantages that the optical system is large in
field of view and relative aperture, wide in spectral range and easy to
machine, assemble and adjust, and the like.