CN209928138U - Off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system - Google Patents
Off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system Download PDFInfo
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Abstract
The patent discloses an off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system. 2.5-degree-2.5-degree scenery with a large field of view passes through the off-axis three-mirror telescope, light is split by using the position of an off-axis three-mirror intermediate image surface, and full-wave band separation imaging from visible light to long-wave infrared is realized through the two off-axis three-mirror, the four color splitting sheets and the four groups of relay lenses. The large-aperture and large-relative-aperture high-resolution imaging device can realize large-aperture and large-relative-aperture high-resolution imaging, can realize large-view-field staring imaging, avoids moving scanning components, and has a simple and compact structure; the imaging wave band is wide, and covers five channels with visible infrared and laser ranging receiving functions, so that the problem that the multiple channels are difficult to arrange is solved, and the detection performance of the instrument is obviously improved; the aperture diaphragm of the optical system reaches 500mm, the relative aperture of the medium-wave and long-wave infrared channels reaches 1/1.1, and the designed real exit pupil is matched with the position of the Dewar cold diaphragm, so that the influence of background radiation on infrared imaging is effectively inhibited.
Description
Technical Field
The patent relates to a satellite-borne large-relative-aperture large-aperture high-resolution all-band imager, in particular to a multi-channel visible infrared imager form combining an off-axis three-mirror telescope, a color separation sheet and a relay lens group.
Background
The infrared camera with large field of view and high resolution is a key load of a ground remote sensing and space astronomical system. The large-view-field infrared camera can cover a wide monitoring area, and has important significance for improving time resolution, shortening revisit period and realizing high-density observation. The spatial resolution of the camera is improved, and more accurate position, posture and geometric shape information of the target can be provided.
Several astronomical satellites with infrared cameras have been successfully launched in the united states, japan and europe, such as the first infrared astronomical satellite IRAS, the astronomical satellite AKARI launched in japan, the infrared astronomical satellite Spitzer developed in the united states, the infrared astronomical satellite Herschel developed in europe, and so on.
The ESA of European space agency (25 D.1.1983) launched the first infrared astronomical satellite IRAS (Infrared astronomy satellite) in the world, and the telescope is an RC system with a clear aperture of 0.57m and a focal length of 5.5m, and 96% of celestial spheres are generally examined by 4 wave bands of 12 μm, 25 μm, 60 μm and 100 μm at a spatial resolution of 25 "-100" to detect 35 ten thousand infrared radiation sources.
In 2006, 2.21, an infrared astronomical satellite akari (infrared imaging surveyyor) was successfully launched in japan. The satellite was equipped with 3 infrared detectors using a 512 x 512-element InSb (1.7-5.5 μm),256 x 256-element Si: as (5.8-14.1 μm) and 256X 256 Si: as (12.4-26.5 μm) and an operating temperature of about 2K. The main optical system of the satellite is an RC system with the caliber of 0.67m and the focal length of 4.2m, and can carry out high-spatial resolution and high-sensitivity imaging observation on a celestial body target.
The Spitzer Space Telescope, launched on 25.8.2008, is the last Space astronomical satellite of the four astronomical benches program of the United states Space agency. The main optical system of the Spitzer is an RC system with the caliber of 0.85m and the focal length of 10.2m, and is provided with 3 high infrared detectors of an infrared camera, an infrared spectrometer and an infrared imaging photometer. The infrared camera images the target shot with a resolution of 1.2 "using 4 independent bands within the 3.6-8.0 μm band.
The European Space agency of 14 th 5 th month in 2009 emitted Herschel Space observer, which is mainly used for detecting middle and far infrared rays and submillimeter waves, and is also an infrared astronomical satellite with the largest caliber in Space at present. The main optical system of Herschel adopts an RC system with the caliber of 3.5m and the focal length of 28.5m, and the effective light collection area of the optical system is 9.6m2The detection wave band covers 60-670 μm.
With the progress of various related technologies, the main technical indexes of the infrared camera are obviously improved, and meanwhile, the requirements on the infrared camera in the future are also improved, which is mainly shown in the following steps:
1. staring imaging with ultra-large field of view
The field angle is a very critical parameter in object discovery and detection, early warning and surveillance applications. The optical system selects an RC system with two coaxial reflections, and the available field of view is small (less than 1 degree).
2. High resolution
The limit resolution and the signal-to-noise ratio of the infrared optical system are limited by the relative aperture of the optical system, the larger the relative aperture is, the stronger the light-gathering capacity of the optical system is, the higher the transfer function value at the same Nyquist frequency is, and the higher the resolution and the signal-to-noise ratio are. The requirement of high resolution ratio of infrared optical observation is the requirement of a large-caliber large-relative-aperture infrared optical system. The relative aperture of the optical system is distributed between 8.14 and 12, and the relative aperture is small.
The visible infrared optical scheme combining the off-axis three-mirror intermediate image surface position for light splitting and the two off-axis three-mirror and relay lens group is adopted, so that large-caliber large-relative-caliber high-resolution imaging can be realized, large-field staring imaging can also be realized, a moving scanning component is avoided, and the structure is simple and compact; the imaging wave band is wide, and the visible infrared and laser ranging receiving functions are covered by five channels in total; the real exit pupil designed by the medium wave and long wave infrared channels is superposed with the Dewar cold diaphragm, so that the influence of background radiation on infrared imaging is effectively inhibited. Therefore, the problem that the multiple channels are difficult to arrange under the conditions of large visual field and large relative aperture of the visible infrared imaging camera is solved, high-resolution imaging of the large visual field and the large relative aperture is realized, and the detection efficiency is improved.
Disclosure of Invention
The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system provides a novel optical system form for researching a high-resolution multi-channel full-waveband imaging camera. The technical idea of the patent is that off-axis three-mirror is adopted as a telescope structure form, wave band separation is carried out based on a color separation sheet, two three mirrors and respective relay lens groups are adopted to realize large view field 2.5 degrees x 2.5 degrees and large relative aperture 1.1 to ground object target full-wave band imaging, and the imaging device comprises five channels including a laser receiving module, a visible light imaging module, a short wave imaging module, a medium wave imaging module and a long wave imaging module. The optical system comprises an off-axis primary mirror 1, an off-axis secondary mirror 2, a first dichroic sheet 3, a first off-axis three mirror 4, a visible light refractor 5, a second dichroic sheet 6, a visible light focal plane 7, a laser receiving lens group 8, a laser receiving focal plane 9, a second off-axis three mirror 10, a third dichroic sheet 11, a medium-long wave correcting lens 12, a fourth dichroic sheet 13, a medium wave correcting lens group 14, a medium wave focal plane 15, a long wave correcting lens group 16, a long wave focal plane 17, a first short wave refractor 18, a short wave correcting lens 19, a second short wave refractor 20, a short wave correcting lens group 21 and a short wave focal plane (22). The technical solution of this patent is as follows:
visible, short wave, medium wave and long wave imaging light beams from a target within the range of 3.75 degrees +/-1.25 degrees of a central field of view in a meridian plane and +/-1.25 degrees of a sagittal plane are reflected by an off-axis primary mirror 1 and an off-axis secondary mirror 2 in an off-axis three-mirror telescope, then separation imaging of visible light and laser wave bands and short wave and medium wave bands is carried out at a first color separation sheet 3, the visible light and 1064nm laser wave bands are reflected by the first color separation sheet 3, and the short wave, the medium wave and the long wave bands are transmitted. The first dichroic sheet 3 reflects visible light beams, the visible light beams are reflected by the first off-axis three mirror 4 and the visible light deflection mirror 5, visible light and laser wave bands are separated on the second dichroic sheet 6, and the second dichroic sheet 6 reflects visible light transmission laser wave bands. The visible light is reflected by the second dichroic plate 6 and converged on the visible light focal plane 7 to form an image. Short wave and medium wave band scenery light is transmitted through the first color separation plate 3 and reflected and converged by the second off-axis three mirrors 10, short wave and medium wave band separation is carried out through the third color separation plate 11, and the medium wave and long wave band are reflected by the third color separation plate 11 and the short wave band is transmitted. After the medium-long wave band is reflected by the third dichroic filter 11 and transmitted by the medium-long wave correction lens 12, the medium-long wave band and the long-long wave band are separated at the fourth dichroic filter 13, and the medium-long wave band is reflected by the fourth dichroic filter 13. The middle wave band is transmitted through the fourth color separation sheet 13 and is transmitted and converged to form an image on a middle wave focal plane 15 through the middle wave correction lens group 14; the long wave band is reflected by the fourth color splitter 13 and transmitted by the long wave correction lens group 16 to be converged and imaged on a long wave focal plane 17. After being transmitted by the third dichroic filter 11 and reflected by the first short wave turning mirror 18, the short-wave scene light is transmitted by the short-wave correction lens 19 and reflected by the second short wave turning mirror 20, and then is converged and imaged on the short-wave focal plane 22 by the short-wave correction lens group 21. The relative aperture of the medium wave imaging module and the long wave imaging module is up to 1/1.1 under the condition of 500mm of the aperture diaphragm, the scene imaging with the view field reaching 2.5 degrees can be realized, and the real exit pupil is designed at the position 35mm in front of the focal plane, so that the stray radiation influence can be effectively inhibited. The short wave imaging module and the visible light imaging module can realize scene imaging with an aperture diaphragm of 500mm, relative apertures of 1/1.5 and 1/3 respectively and a field of view of 2.5 degrees.
After laser echo beams with the wavelength of 1064nm in the ranges of 3.75 degrees +/-0.05 degrees of a central field of view in a meridian plane and a sagittal plane +/-0.05 degrees from a target are reflected by an off-axis primary mirror 1 and an off-axis secondary mirror 2 in an off-axis three-mirror telescope, the laser beams are reflected by a first off-axis three-mirror 4 and a visible light refractor 5, the laser beams with the wavelength of 1064nm are transmitted to the position of an off-axis three-reflection focal plane through a second dichroic plate 6, and are collimated and converged to a laser receiving focal plane 9 through a laser receiving lens group 8 to realize the laser ranging function of an aperture diaphragm with the size of 500mm and an opposite aperture of 1/4.
The off-axis main mirror 1 is a metal or glass concave reflector and has a six-order hyperboloid surface shape. The off-axis secondary mirror 2 is a metal or glass convex reflector and has a six-order hyperboloid shape. The first color separation sheet 3 is made of zinc selenide material, the reflection wave band is 0.4-1.1 micrometer, and the transmission is 1.15-15 micrometer. The first off-axis three mirrors 4 and the second off-axis three mirrors 10 adopt the same eight-order hyperboloid shape and are metal or glass concave reflectors. The visible light refractor 5, the first short wave refractor 18 and the second short wave refractor 20 are metal or glass plane reflectors. The second dichroic filter 6 is made of quartz material, and reflects a visible wave band of 0.4-0.9 micrometer, and transmits a laser wave band of 1-1.1 micrometer. The laser receiving lens group 8 consists of four quartz lenses and an ultra-narrow band quartz filter, and sequentially comprises a biconvex lens, a planar ultra-narrow band filter, a concave-convex lens and a biconvex lens. The third dichroic filter 11 is made of zinc selenide material, reflects the medium and long wave bands 2-15 microns, and transmits the short wave bands 1.15-1.8 microns. The medium-long wave correcting lens 12 is a convex-concave lens made of germanium material, the surface shape is a spherical surface, and the surface is plated with an anti-reflection film. The fourth dichroic filter 13 is made of germanium material, transmits the middle wave band of 2-5 microns, and reflects the long wave band of 8-15 microns. The medium wave correcting lens group 14 is composed of six lenses, which are a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, the materials are respectively germanium, zinc selenide, germanium and zinc selenide, the surface shapes are spherical, and the surface is coated with an antireflection film. The long-wave correction lens group 16 consists of six lenses, namely a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, wherein the materials are respectively germanium, zinc selenide, germanium and zinc selenide, the surface shapes are spherical, and an antireflection film is plated on the surface. The short wave correction lens 19 is a concave-convex lens made of germanium materials, the surface shape is a spherical surface, and the surface is coated with an antireflection film. The short wave correction lens group 21 consists of six lenses, namely a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, wherein the materials are respectively zinc selenide, germanium and zinc selenide, the surface shapes are spherical surfaces, and the surfaces are coated with antireflection films.
This patent combines together off-axis three-mirror has middle image plane system and color separation piece and relay lens group, under big visual field and the big relative aperture condition, has obviously promoted the function that the wave band was surveyed, has realized full wave band multichannel formation of image, and the characteristics of system are as follows:
1. when the off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system works, the structure is simple, only four aspheric surfaces and a plurality of transmission spherical surfaces are provided, the system imaging is excellent, and no center blocking exists. Under the conditions that the field of view is 2.5 degrees multiplied by 2.5 degrees and the relative aperture is 1.1, the medium-wave and long-wave infrared spatial resolution is 55 mu rad, and the channel transfer function is better than 0.5 at the Nyquist frequency of 17 lp/mm; the spatial resolution of the visible wave band reaches 20 mu rad when the imaging field of view is 2.5 degrees multiplied by 2.5 degrees and the relative aperture is 3, and the channel transfer function is better than 0.75 at the Nyquist frequency of 17 lp/mm; the short wave band imaging field of view is larger than 2.5 degrees multiplied by 2.5 degrees, the spatial resolution reaches 40 mu rad when the relative aperture is 1.5, and the channel transfer function is better than 0.6 at the Nyquist frequency of 17 lp/mm; the laser receiving channel works at a relative aperture of 4, and 90% of imaging energy is concentrated in a circle with a diffuse spot of 0.1 mm.
2. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system adopts the position of an off-axis three-mirror middle image surface, and uses the color separation sheet and the two three mirrors to separate wave bands, thereby effectively realizing the separation layout of five channels of visible, short, medium and long waves and solving the problem that the multi-channel is difficult to design under the conditions of large visual field and large relative aperture.
3. The real exit pupil is designed in front of the focal planes of the medium wave channel and the long wave channel of the off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system, and the influence of stray background radiation can be effectively inhibited by combining the real exit pupil with the cold stop of the detector.
4. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system is widely applied in the forms of detection, global mapping, earth science, atmospheric exploration, lunar exploration, Mars or asteroid exploration and other high-resolution visible infrared imaging fields or laser three-dimensional imaging fields.
Drawings
Fig. 1 and 2 are optical path diagrams of an off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system, which include an off-axis primary mirror (1), an off-axis secondary mirror (2), a first dichroic sheet (3), a first off-axis three mirror (4), a visible light refractor (5), a second dichroic sheet (6), a visible light focal plane (7), a laser receiving lens group (8), a laser receiving focal plane (9), a second off-axis three mirror (10), a third dichroic sheet (11), a medium-long wave correcting lens (12), a fourth dichroic sheet (13), a medium wave correcting lens group (14), a medium wave focal plane (15), a long wave correcting lens group (16), a long wave focal plane (17), a first short wave refractor (18), a short wave correcting lens (19), a second short wave refractor (20), a short wave correcting lens group (21) and a short wave focal plane (22). .
Detailed Description
This patent has designed an off-axis three anti-five-channel visible infrared formation of image and laser receiving optical system, and like the matter fine, the main technical index of system is as follows:
1. caliber: aperture diaphragm 500 mm;
2. visual field: 2.5 ° × 2.5 °;
3. imaging wave band: visible light channel 0.4-0.9 μm, short wave band 1.2-1.8 μm, medium wave band 2-5 μm, long wave band 8-15 μm; the laser receiving channel wave band is 1064 nm;
4. relative pore diameter: the visible spectrum optical system has the relative aperture 1/3 and the focal length of 1500 mm; the relative aperture of the short-wave spectrum optical system is 1/1.5, and the focal length is 750 mm; the relative aperture of the optical system of the medium wave and long wave spectral bands is 1/1.1, and the focal length is 550 mm; laser receive channel relative aperture 1/4;
5. detector parameters: the size of a pixel of the visible light detector is 30 mu m, and the number of the pixels is 2 Kx 2K; the size of the short-wave detector pixel is 30 mu m, and the number of pixels is 1 Kx 1K; the size of the pixels of the medium wave and long wave detectors is 30 mu m, and the number of the pixels is 1 Kx 1K; the pixel of the laser receiving channel detector is 0.8 mm;
6. spatial resolution: the visible spectrum is better than 20 mu rad, the short spectrum is better than 40 mu rad, and the medium wave and long wave spectrums are better than 55 mu rad;
7. imaging performance: the visible spectrum band of the full-field transfer function at the Nyquist frequency of 17lp/mm is better than 0.75, the short-wave spectrum band is better than 0.6, the medium-wave and long-wave spectrum bands are better than 0.5, and 90% of imaging energy of a laser receiving channel is concentrated in a scattered spot circle of 0.1 mm;
8. actual exit pupil position: the medium and long wavelength channels have a real exit pupil 35mm in front of the focal plane.
The specific design parameters of the optical system are shown in table 1:
TABLE 1 optical System specific design parameters
Claims (15)
1. An off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system comprises a laser receiving module, a visible light imaging module, a short wave imaging module, a medium wave imaging module and a long wave imaging module, wherein the optical system comprises an off-axis primary mirror (1), an off-axis secondary mirror (2), a first color separation sheet (3), a first off-axis tertiary mirror (4), a visible light refractor (5), a second color separation sheet (6), a laser receiving lens group (8), a laser receiving focal plane (9), a second off-axis tertiary mirror (10), a third color separation sheet (11), a medium and long wave correcting lens (12), a fourth color separation sheet (13), a medium wave correcting lens group (14), a long wave correcting lens group (16), a first short wave refractor (18), a short wave correcting lens (19), a second short wave refractor (20) and a short wave correcting lens group (21); the method is characterized in that:
visible, short wave, medium wave and long wave imaging light beams from a target within the range of 3.75 degrees +/-1.25 degrees of a central field of view in a meridian plane and +/-1.25 degrees of a sagittal plane are reflected by an off-axis primary mirror (1) and an off-axis secondary mirror (2) in an off-axis three-mirror telescope, then separation imaging of visible light and laser wave bands and short wave and medium wave bands is carried out at a first color separation sheet (3), the visible light and 1064nm laser wave bands are reflected by the first color separation sheet (3), and the short wave, the medium wave and the long wave bands are transmitted; the first dichroic sheet (3) reflects visible light beams, the visible light beams are reflected through the first off-axis three mirrors (4) and the visible light deflection mirror (5), visible light and laser wave bands are separated on the second dichroic sheet (6), and the visible light beams are reflected by the second dichroic sheet (6) and transmitted through the laser wave bands; visible light is reflected by the second dichroic filter (6) and converged on the visible light focal plane (7) for imaging; short-wave and medium-wave band scenery light rays are transmitted by a first color separation sheet (3) and reflected and converged by a second off-axis three mirror (10), then the short-wave and medium-wave bands are separated by a third color separation sheet (11), the medium-wave and long-wave bands are reflected by the third color separation sheet (11), and the short-wave bands are transmitted; after the medium-long wave band is reflected by the third dichroic filter (11) and transmitted by the medium-long wave correction lens (12), the medium-long wave band and the long-long wave band are separated by the fourth dichroic filter (13), and the medium-long wave band is reflected by the fourth dichroic filter (13) after being transmitted by the medium-long wave band; the medium wave band is transmitted through a fourth dichroic filter (13) and is transmitted through a medium wave correction lens group (14) to be converged and imaged on a medium wave focal plane (15); the long wave band is reflected by a fourth color separation sheet (13) and transmitted by a long wave correction lens group (16) to be converged and imaged on a long wave focal plane (17); after being transmitted by a third dichroic filter (11) and reflected by a first short wave turning mirror (18), the short-wave scene light is transmitted by a short-wave correction lens (19) and reflected by a second short wave turning mirror (20), and is converged and imaged on a short-wave focal plane (22) by a short-wave correction lens group (21); the medium wave imaging module and the long wave imaging module reach 1/1.1 of the relative aperture under the condition of 500mm of the aperture diaphragm, scene imaging with the view field reaching 2.5 degrees can be realized, and a real exit pupil is designed 35mm in front of a focal plane, so that stray radiation influence can be effectively inhibited; the short wave imaging module and the visible light imaging module can realize scene imaging with an aperture diaphragm of 500mm, relative apertures of 1/1.5 and 1/3 respectively and a field of view of 2.5 degrees;
laser echo beams with the wavelength of 1064nm in the range of 3.75 degrees +/-0.05 degrees of a central field of view in a meridian plane and the range of a sagittal plane +/-0.05 degrees from a target are reflected by an off-axis primary mirror (1) and an off-axis secondary mirror (2) in an off-axis three-mirror telescope, the laser beams are reflected by a first color separation plate (3), reflected by a first off-axis three-mirror (4) and a visible light deflection mirror (5), transmitted to the position of an off-axis three-mirror focal plane through a second color separation plate (6) and collimated and converged to a laser receiving focal plane (9) through a laser receiving lens group (8) to realize the laser ranging function of an aperture diaphragm 500mm and a relative aperture 1/4.
2. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the off-axis main mirror (1) is a metal or glass concave reflector and has a six-order hyperboloid surface shape.
3. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the off-axis secondary mirror (2) is a metal or glass convex reflector and has a six-order hyperboloid surface shape.
4. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the first color separation sheet (3) is made of zinc selenide materials, the reflection wave band is 0.4-1.1 microns, and the transmission is 1.15-15 microns.
5. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the first off-axis three mirrors (4) and the second off-axis three mirrors (10) adopt the same eight-order hyperboloid shape and are metal or glass concave reflectors.
6. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the visible light refractor (5), the first short wave refractor (18) and the second short wave refractor (20) are metal or glass plane reflectors.
7. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the second dichroic filter (6) is made of quartz materials, reflects a visible wave band of 0.4-0.9 micrometer, and transmits a laser wave band of 1-1.1 micrometer.
8. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the laser receiving lens group (8) consists of four quartz lenses and an ultra-narrow band quartz filter, and sequentially comprises a biconvex lens, a planar ultra-narrow band filter, a concave-convex lens and a biconvex lens.
9. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the third dichroic filter (11) is made of zinc selenide materials, reflects the medium-long wave band by 2-15 microns, and transmits the short wave band by 1.15-1.8 microns.
10. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the medium-long wave correcting lens (12) is a convex-concave lens made of germanium materials, the surface shape is a spherical surface, and the surface is plated with an antireflection film.
11. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the fourth dichroic filter (13) is made of germanium material, transmits a medium wave band of 2-5 microns, and reflects a long wave band of 8-15 microns.
12. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the medium wave correction lens group (14) consists of six lenses, namely a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, the materials are respectively germanium, zinc selenide, germanium and zinc selenide, the surface shapes are spherical, and an antireflection film is coated on the surface.
13. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the long-wave correction lens group (16) consists of six lenses, namely a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, the materials are respectively germanium, zinc selenide, germanium and zinc selenide, the surface shapes of the lenses are spherical, and an antireflection film is coated on the surface of the lenses.
14. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the short wave correction lens (19) is a concave-convex lens made of germanium materials, the surface shape is a spherical surface, and an antireflection film is plated on the surface.
15. The off-axis three-mirror five-channel visible infrared imaging and laser receiving optical system of claim 1, wherein: the short wave correction lens group (21) consists of six lenses, namely a concave-convex lens, a convex-concave lens, a concave-convex lens and a convex-concave lens in sequence, wherein the materials are respectively zinc selenide, germanium and zinc selenide, the surface shapes of the lenses are spherical, and the surfaces of the lenses are coated with antireflection films.
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