A three-band common aperture multifunctional optical system

Abstract

A three-band common aperture multifunctional optical system. The invention belongs to the field of optical imaging technology, and specifically relates to the technical field of multi-band common aperture optical systems. The invention solves the problem that the previous multi-band common aperture optical systems cannot realize integration, multifunctionality and miniaturization at the same time. The three-band common aperture multifunctional optical system comprises: a primary mirror L1, a secondary mirror L2, a multi-band compensation mirror group L3, a first reflector L4, a first beam splitter L5, a second reflector L6, a medium-wave infrared mirror group L7, a third reflector L8, a laser and short-wave infrared common mirror group L9, a second beam splitter L10, a laser emission mirror group L11, a fiber optic light source S1 and a short-wave infrared mirror group L12. The system comprises an imaging optical path and a laser emission optical path.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular to the technical field of multi-band common aperture optical systems. Background Art

[0002] In order to adapt to the severe challenges brought by the diversity of targets, complexity of environment and diversity of tasks in battlefield environments, airborne optoelectronic payloads are constantly developing in the direction of low cost, miniaturization, light weight and multi-task integration.

[0003] The laser emission optical system is a key device for realizing the target positioning and aiming function. In order to realize the long-distance transmission of laser, the emission optical system should have a large aperture and a small laser divergence angle. Medium-wave infrared target detection can realize day and night imaging, which is an effective way to realize target detection. In addition, short-wave infrared can realize the detection of laser spots with wavelengths between the short-wave band. In order to meet the needs of long-distance target detection, the spatial resolution of the system is generally improved by increasing the focal length and effective aperture of the optical system. Since the airborne environment has very strict requirements on volume and weight, if the optical system is designed separately, it will increase the cost, the structure will become more complicated, and the size and weight will be increased. Summary of the invention

[0004] In order to solve the problem that the conventional multi-band common aperture optical system cannot realize integration, multi-function and miniaturization at the same time, the present invention provides a three-band common aperture multi-function optical system, characterized in that the system comprises a primary mirror, a secondary mirror, a multi-band compensation mirror group, a first reflecting mirror, a first beam splitter, a second reflecting mirror, a medium-wave infrared mirror group, a third reflecting mirror, a laser and short-wave infrared common mirror group, a second beam splitter, a laser emission mirror group, an optical fiber light source and a short-wave infrared mirror group, and the system comprises an imaging optical path and a laser emission optical path;

[0005] The imaging optical path includes a short-wave infrared optical path and a medium-wave infrared optical path. In the short-wave infrared optical path, the short-wave infrared light is incident on the primary mirror, and reaches the secondary mirror after being reflected by the primary mirror. After being reflected by the secondary mirror, it is transmitted through the multi-band compensation mirror group and the first reflector, and then reflected and converged through the first beam splitter to form a primary image plane. After being reflected by the third reflector, the short-wave infrared light beam is further transmitted through the laser and short-wave infrared common mirror group, the second beam splitter, and the short-wave infrared mirror group, and finally forms an image on the short-wave infrared detector target surface.

[0006] In the medium-wave infrared optical path, the medium-wave infrared light is incident on the primary mirror, and reaches the secondary mirror after being reflected by the primary mirror. After being reflected by the secondary mirror, the medium-wave infrared light beam is transmitted through the multi-band compensation mirror group and reflected by the first reflector. After being transmitted through the first beam splitter, the medium-wave infrared light beam is reflected by the second reflector and converges to form a primary image plane. The light beam reflected by the second reflector is imaged on the target surface of the medium-wave infrared detector by the medium-wave infrared mirror group.

[0007] In the laser emission optical path, the laser emitted by the fiber optic light source is collimated and expanded by the laser emission mirror group, reflected by the second beam splitter, transmitted by the laser and short-wave infrared common mirror group, and then converged into a focus by the third reflector. After being reflected by the first beam splitter and the first reflector, it is transmitted by the multi-band compensation mirror group, and finally reflected by the secondary mirror and the primary mirror before being expanded and emitted again.

[0008] The beneficial effects of the three-band common-aperture multifunctional optical system described in the present invention are as follows: the optical system described in the present invention realizes a common-aperture optical system integrating long-focus short-wave infrared, long-focus medium-wave infrared, and laser beams in multiple bands. The long-focus short-wave infrared and long-focus medium-wave infrared optical systems have the advantages of large aperture, long-distance detection and identification, and high imaging resolution. While realizing the imaging function, the laser emission optical system and the long-focus short-wave infrared and long-focus medium-wave infrared adopt a common-aperture design. The laser spot after collimation and beam expansion has the advantages of small divergence angle and high uniformity, so that it can effectively transmit over a long distance while ensuring that the output energy is highly concentrated. At the same time, the laser wavelength is within the long-focus short-wave infrared band, and the long-focus short-wave infrared system can realize the detection of the laser spot. The three-band common-aperture multifunctional optical system of the present invention has a compact structure and meets the needs of miniaturization and integration of optoelectronic systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional structural diagram of a three-band common aperture multifunctional optical system in an embodiment of the present invention;

[0010] Figure 2 It is a planar structural diagram of a three-band common aperture multifunctional optical system in an embodiment of the present invention;

[0011] Figure 3 It is a planar structural diagram of the multi-band compensation mirror group L3 in an embodiment of the present invention;

[0012] Figure 4 This is a planar structural diagram of the medium-wave infrared mirror group L7 in an embodiment of the present invention;

[0013] Figure 5 This is a planar structural diagram of the laser and short-wave infrared common mirror group L9 in an embodiment of the present invention;

[0014] Figure 6 This is a planar structural diagram of the laser emission mirror group L11 in an embodiment of the present invention;

[0015] Figure 7 Schematic diagram of the planar structure of the short-wave infrared mirror group L12 in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0017] Embodiment 1,

[0018] like Figure 1 and Figure 2 The figure shows the structure diagram of the three-band common-aperture multifunctional optical system of the present invention. In order to present the structure of the optical system more accurately and clearly, a combination of stereogram and plane diagram is adopted.

[0019] The three-band common aperture multifunctional optical system includes: a primary mirror L1, a secondary mirror L2, a multi-band compensation mirror group L3, a first reflector L4, a first beam splitter L5, a second reflector L6, a medium-wave infrared mirror group L7, a third reflector L8, a laser and short-wave infrared common mirror group L9, a second beam splitter L10, a laser emission mirror group L11, a fiber optic light source S1 and a short-wave infrared mirror group L12. The system includes an imaging optical path and a laser emission optical path.

[0020] In the imaging optical path, the short-wave infrared and medium-wave infrared light beams are incident on the primary mirror L1, and reach the secondary mirror L2 after being reflected by the primary mirror L1. After being reflected by the secondary mirror L2, the short-wave infrared light beams are transmitted through the multi-band compensation mirror group L3 and reflected by the first reflector L4. After that, the short-wave infrared light beams are reflected and converged through the first beam splitter L5 to form a primary image plane. The primary image plane of the short-wave infrared light beam is located between the first beam splitter L5 and the third reflector L8. After being reflected by the third reflector L8, the short-wave infrared light beams are transmitted through the laser and short-wave infrared common mirror group L9, the second beam splitter L10, and the short-wave infrared mirror group L12, and finally imaged on the short-wave infrared detector target surface.

[0021] The medium-wave infrared light beam is transmitted through the first beam splitter L5 and then reflected by the second reflector L6 before converging to form a primary image plane. The primary image plane of the medium-wave infrared light beam is located between the second reflector L6 and the medium-wave infrared mirror group L7. The light beam reflected by the second reflector L6 is imaged on the target surface of the medium-wave infrared detector by the medium-wave infrared mirror group L7.

[0022] In the laser emission optical path, the laser emitted by the fiber optic light source S1 is collimated and expanded by the laser emission mirror group L11, reflected by the second beam splitter L10, transmitted by the laser and short-wave infrared common mirror group L9, and then converged into a focus by the third reflector L8. The focus is located between the third reflector L8 and the first beam splitter L5, and then reflected by the first beam splitter L5 and the first reflector L4, and then transmitted by the multi-band compensation mirror group L3, and finally reflected by the secondary mirror L2 and the primary mirror L1 before being expanded and emitted again.

[0023] Embodiment 2,

[0024] This embodiment is a further limitation of Embodiment 1. Figure 3 As shown, in the three-band common-aperture multifunctional optical system, the main mirror L1 has a hole in the center, the reflecting surface of the main mirror L1 is a concave parabola, the reflecting surface of the secondary mirror L2 is a convex hyperboloid, the multi-band compensation mirror group L3 has a positive optical focal length, the multi-band compensation mirror group L3 is arranged between the secondary mirror L2 and the first reflecting mirror L4, the multi-band compensation mirror group L3 is arranged on the horizontal line where the hole in the center of the main mirror L1 is located, the medium-wave infrared mirror group L7 has a positive optical focal length, the laser and short-wave infrared shared mirror group L9 has a positive optical focal length, the short-wave infrared mirror group L12 has a positive optical focal length, and the laser emission mirror group L11 is in a collimated beam expansion form.

[0025] In this embodiment, the primary mirror L1 and the secondary mirror L2 adopt a Cassegrain structure. Such a configuration can meet the size requirements of a long focal length and a large aperture, reduce the space volume of a three-band common aperture multifunctional optical system, and reduce the structural complexity and production cost; the multi-band compensation lens group L3 can reduce off-axis aberrations, realize the integrated design of short-wave and medium-wave infrared and simultaneous imaging. The material of the primary mirror L1 and the secondary mirror L2 is microcrystal. Such a configuration can make the primary mirror L1 and the secondary mirror L2 have the advantages of high and low temperature resistance and a small thermal expansion coefficient.

[0026] Embodiment 3,

[0027] This embodiment is a further limitation of Embodiment 1. In the three-band common-aperture multifunctional optical system, the reflecting surface of the first reflector L4 is a plane for reflecting a short-wave infrared beam, a laser beam, and a medium-wave infrared beam; the reflecting surface of the second reflector L6 is a plane for reflecting a medium-wave infrared beam; and the reflecting surface of the third reflector L8 is a plane for reflecting a short-wave infrared beam and a laser beam.

[0028] In this embodiment, the materials of the first reflector L4, the second reflector L6, and the third reflector L8 are all H-K9L produced by Chengdu Guangming Company, which has the characteristics of low price and stable production frequency.

[0029] Embodiment 4,

[0030] This embodiment is a further limitation of Embodiment 1. In the three-band common-aperture multifunctional optical system, the reflection surface and the transmission surface of the first beam splitter L5 are both planes, which are used to decompose the incident light beam into a medium-wave infrared beam, a short-wave infrared beam, and a laser beam. The first beam splitter L5 is used to reflect the short-wave infrared beam and the laser beam, and transmit the medium-wave infrared beam; the reflection surface and the transmission surface of the second beam splitter L10 are both planes, which are used to reflect the laser beam and transmit the short-wave infrared beam.

[0031] In this embodiment, the first beam splitter L5 and the second beam splitter L6 are made of single crystal silicon and have good beam splitting capability.

[0032] Embodiment 5,

[0033] This embodiment is a further limitation of Embodiment 1. In the three-band common-aperture multifunctional optical system, the first reflector L4 is placed at 45° to the vertical plane, the first beam splitter L5, the second reflector L6, the third reflector L8, and the second beam splitter L10 are all placed at 45° to the horizontal plane, and the placement position of each of the above mirrors needs to ensure that the light incident thereon and the light reflected therefrom are at 90°.

[0034] In this embodiment, the wavelength of the short-wave infrared band is 0.9-1.7 microns, the wavelength of the laser band is between 0.9-1.7 microns, and the wavelength of the mid-infrared band is 3-5 microns.

[0035] Embodiment 6,

[0036] This embodiment is a further limitation of Embodiment 1. Figure 3 As shown, the multi-band compensation mirror group L3 includes a multi-band compensation mirror L31 and a multi-band compensation mirror L32 which are sequentially arranged along the incident direction of the light beam, and the multi-band compensation mirror L31 and the multi-band compensation mirror L32 are arranged between the secondary mirror L2 and the first reflecting mirror L4. The multi-band compensation mirror L31 is a meniscus spherical lens with positive optical power, and the multi-band compensation mirror L32 is a meniscus spherical lens with negative optical power.

[0037] In this embodiment, the materials of the multi-band compensation mirror L31 and the multi-band compensation mirror L32 are both multi-spectral zinc sulfide, which has good achromatic ability in a wide band range.

[0038] Embodiment 7,

[0039] This embodiment is a further limitation of Embodiment 1. Figure 4As shown, the medium-wave infrared mirror group L7 includes a medium-wave infrared first lens L71, a medium-wave infrared second lens L72, a medium-wave infrared third lens L73, a medium-wave infrared folding mirror L74, a medium-wave infrared fourth lens L75, a medium-wave infrared fifth lens L76, a medium-wave infrared sixth lens L77, a medium-wave infrared detector window L78, and a medium-wave infrared detector filter L79, which are arranged in sequence along the incident direction of the medium-wave infrared beam. The medium-wave infrared first lens L71 is a meniscus aspheric lens with negative optical focal length, the medium-wave infrared second lens L72 is a meniscus cylindrical lens with positive optical focal length, the medium-wave infrared third lens L73 is a meniscus spherical lens with positive optical focal length, the medium-wave infrared folding mirror L74 is a plane reflector placed at 45° to the horizontal plane, and its placement position needs to ensure that the light incident thereon and the light reflected therefrom are at 90°, the medium-wave infrared fourth lens L75 is a meniscus aspheric lens with positive optical focal length, the medium-wave infrared fifth lens L76 is a meniscus aspheric lens with negative optical focal length, and the medium-wave infrared sixth lens L77 is a biconvex spherical lens with positive optical focal length.

[0040] In this embodiment, the medium-wave infrared lens L7 group adopts a secondary imaging structure, and the imaging quality is close to the diffraction limit, achieving 100% cold stop matching.

[0041] In this embodiment, the material of the medium-wave infrared first lens L71 is single crystal germanium, the material of the medium-wave infrared second lens L72 is single crystal silicon, the material of the medium-wave infrared third lens L73 is single crystal germanium, the material of the medium-wave infrared folding mirror L74 is H-K9L, the material of the medium-wave infrared fourth lens L75 is single crystal silicon, the material of the medium-wave infrared fifth lens L76 is single crystal germanium, and the material of the medium-wave infrared sixth lens L77 is single crystal silicon.

[0042] Embodiment 8,

[0043] This embodiment is a further limitation of Embodiment 1. Figure 5 As shown, the laser and short-wave infrared common lens group L9 includes a laser and short-wave infrared common first lens L91, a laser and short-wave infrared common second lens L92, and a laser and short-wave infrared common third lens L93, which are sequentially arranged along the incident direction of the short-wave infrared beam. The laser and short-wave infrared common first lens L91 is a meniscus spherical lens with positive focal length, the laser and short-wave infrared common second lens L92 is a meniscus spherical lens with positive focal length, and the laser and short-wave infrared common third lens L93 is a biconvex spherical lens with positive focal length.

[0044] In this embodiment, the material of the first lens L91 shared by the laser and short-wave infrared is H-ZF10, the material of the second lens L92 shared by the laser and short-wave infrared is H-ZF6, and the material of the third lens L93 shared by the laser and short-wave infrared is H-ZF10; the mirror group L9 shared by the laser and short-wave infrared all adopts domestic glass spherical lenses. Such an arrangement can not only ensure the high yield advantage of processing and assembly and further reduce costs, but also ensure the high reliability of the product, so that the mirror group L9 shared by the laser and short-wave infrared meets military standards.

[0045] Embodiment 9,

[0046] This embodiment is a further limitation of Embodiment 1. Figure 6 As shown, the laser emitting mirror group L11 includes a laser emitting first lens L111, a laser emitting second lens L112, a laser emitting third lens L113, a laser emitting first folding mirror L114, a laser emitting fourth lens L115, a laser emitting fifth lens L116, a laser emitting sixth lens L117, and a laser emitting seventh lens L118, which are arranged in sequence along the laser emitting direction. The first laser emission lens L111 is a biconvex spherical lens with positive focal power, the second laser emission lens L112 is a biconcave spherical lens with negative focal power, the third laser emission lens L113 is a meniscus spherical lens with positive focal power, the first laser emission folding mirror L114 is a plane reflector placed at 45° to the horizontal plane, and its placement position needs to ensure that the light incident on it and the light reflected by it are at 90°, the fourth laser emission lens L115 is a biconvex spherical lens with positive focal power, the fifth laser emission lens L116 is a biconcave spherical lens with negative focal power, the sixth laser emission lens L117 is a meniscus spherical lens with positive focal power, and the seventh laser emission lens L118 is a biconvex spherical lens with positive focal power.

[0047] In this embodiment, the laser emission first lens L111 is used to collimate the laser beam emitted by the optical fiber light source S1, and the material of the laser emission first lens L111 is H-ZF10; the laser emission second lens L112, the laser emission third lens L113, and the laser emission fourth lens L115 are combined together to realize the primary beam expansion of the laser beam, and the laser emission first folding mirror L114 is used to realize the folding of the laser beam; the material of the laser emission second lens L112 is H-ZF10, the material of the laser emission third lens L113 is H-ZF6, the material of the laser emission first folding mirror L114 is H-K9L, and the material of the laser emission fourth lens L115 is H-ZF10. The laser emission fifth lens L116, the laser emission sixth lens L117, and the laser emission seventh lens L118 are combined together to realize the secondary beam expansion of the laser beam. The material of the laser emitting fifth lens L116 is H-ZF6, the material of the laser emitting sixth lens L117 is H-ZF10, and the material of the laser emitting seventh lens L118 is H-ZF6.

[0048] Embodiment 10

[0049] This embodiment is a further limitation of Embodiment 1. Figure 7 As shown, the short-wave infrared lens group L12 includes a short-wave infrared first cemented lens L121, a short-wave infrared second cemented lens L122, a short-wave infrared first lens L123, a short-wave infrared first folding mirror L124, a short-wave infrared second lens L125, and a short-wave infrared second folding mirror L126, which are arranged in sequence along the incident direction of the short-wave infrared light beam. The short-wave infrared first glued lens L121 is a double glued lens with negative focal length. The short-wave infrared first glued lens L121 includes a short-wave infrared first glued lens 1 L1211 and a short-wave infrared first glued lens 2 L1212 which are sequentially arranged along the incident direction of the short-wave infrared light beam. The short-wave infrared second glued lens L122 is a double glued lens with positive focal length. The short-wave infrared second glued lens L122 includes a short-wave infrared second glued lens 1 L1221 and a short-wave infrared second glued lens 2 L1222 which are sequentially arranged along the incident direction of the short-wave infrared light beam. The short-wave infrared first lens L123 is a meniscus spherical lens with positive focal length. The short-wave infrared first folding mirror L124 It is a plane reflector placed at 45° to the horizontal plane. Its placement position needs to ensure that the light incident into it and the light reflected by it are at 90°. The short-wave infrared second lens L125 is a meniscus spherical lens with positive optical focal length. The short-wave infrared second folding mirror L126 is a plane reflector placed at 45° to the horizontal plane. Its placement position needs to ensure that the light incident into it and the light reflected by it are at 90°, and it is necessary to ensure that the reflected light is incident on the target surface of the short-wave infrared detector.

[0050] In this embodiment, the material of the short-wave infrared first glued lens L1211 is H-ZF62, the material of the short-wave infrared first glued lens L1212 is H-ZPK5, the material of the short-wave infrared second glued lens L1221 is H-BAK7, the material of the short-wave infrared second glued lens L1222 is H-LAF2, the material of the short-wave infrared first lens L123 is H-LAF3B, the material of the short-wave infrared second lens L125 is H-ZLAF55D, and the material of the short-wave infrared first folding mirror L124 is H-K9L.

Claims

1. A three-band common aperture multifunctional optical system, characterized in that: The system comprises a primary mirror (L1), a secondary mirror (L2), a multi-band compensation mirror group (L3), a first reflector (L4), a first beam splitter (L5), a second reflector (L6), a medium-wave infrared mirror group (L7), a third reflector (L8), a laser and short-wave infrared common mirror group (L9), a second beam splitter (L10), a laser emission mirror group (L11), a fiber optic light source (S1) and a short-wave infrared mirror group (L12); the system comprises an imaging optical path and a laser emission optical path; The imaging optical path comprises a short-wave infrared optical path and a medium-wave infrared optical path. In the short-wave infrared optical path, the short-wave infrared light is incident on the primary mirror (L1), is reflected by the primary mirror (L1), and reaches the secondary mirror (L2). After being reflected by the secondary mirror (L2), the short-wave infrared light is transmitted through the multi-band compensation mirror group (L3) and the first reflector (L4). After being reflected by the first beam splitter (L5), the short-wave infrared light beam is reflected by the third reflector (L8) and then transmitted through the laser and short-wave infrared common mirror group (L9), the second beam splitter (L10), and the short-wave infrared mirror group (L12). Finally, the short-wave infrared light is imaged on the target surface of the short-wave infrared detector. In the medium-wave infrared optical path, the medium-wave infrared light is incident on the primary mirror (L1), is reflected by the primary mirror (L1), and reaches the secondary mirror (L2). After being reflected by the secondary mirror (L2), the medium-wave infrared light beam is transmitted by the multi-band compensation mirror group (L3) and reflected by the first reflector (L4). The medium-wave infrared light beam is transmitted by the first beam splitter (L5) and then reflected by the second reflector (L6) to converge to form a primary image plane. The light beam reflected by the second reflector (L6) is imaged on the target surface of the medium-wave infrared detector through the medium-wave infrared mirror group (L7). In the laser emission optical path, the laser emitted by the fiber optic light source (S1) is collimated and expanded by the laser emission mirror group (L11), reflected by the second beam splitter (L10), transmitted by the laser and short-wave infrared common mirror group (L9), converged into a focus by the third reflector (L8), reflected by the first beam splitter (L5) and the first reflector (L4), transmitted by the multi-band compensation mirror group (L3), and finally reflected by the secondary mirror (L2) and the primary mirror (L1) before being expanded and emitted again; The primary mirror (L1) has a hole at the center, the reflection surface of the primary mirror (L1) is a concave parabola, the reflection surface of the secondary mirror (L2) is a convex hyperboloid, the multi-band compensation mirror group (L3) has a positive optical focal length, the multi-band compensation mirror group (L3) is arranged between the secondary mirror (L2) and the first reflection mirror (L4), the multi-band compensation mirror group (L3) is arranged on the horizontal line where the hole at the center of the primary mirror (L1) is located, the medium-wave infrared mirror group (L7) has a positive optical focal length, the laser and short-wave infrared common mirror group (L9) has a positive optical focal length, the short-wave infrared mirror group (L12) has a positive optical focal length, and the laser emission mirror group (L11) is in a collimated beam expansion form.

2. The three-band common aperture multifunctional optical system according to claim 1, characterized in that: The reflecting surface of the first reflecting mirror (L4) is a plane for reflecting a short-wave infrared beam, a laser beam and a medium-wave infrared beam; the reflecting surface of the second reflecting mirror (L6) is a plane for reflecting a medium-wave infrared beam; and the reflecting surface of the third reflecting mirror (L8) is a plane for reflecting a short-wave infrared beam and a laser beam.

3. The three-band common aperture multifunctional optical system according to claim 2, characterized in that: The reflection surface and the transmission surface of the first beam splitter (L5) are both planes, and are used to decompose the incident light beam into a medium-wave infrared beam, a short-wave infrared beam and a laser beam. The first beam splitter (L5) is used to reflect the short-wave infrared beam and the laser beam, and transmit the medium-wave infrared beam; the reflection surface and the transmission surface of the second beam splitter (L10) are both planes, and are used to reflect the laser beam and transmit the short-wave infrared beam.

4. The three-band common aperture multifunctional optical system according to claim 3, characterized in that: The first reflector (L4) has an inclination angle of 45° to the vertical plane, and the first beam splitter (L5), the second reflector (L6), the third reflector (L8) and the second beam splitter (L10) all have inclination angles of 45° to the horizontal plane.

5. The three-band common aperture multifunctional optical system according to claim 4, characterized in that: The multi-band compensation mirror group (L3) comprises a multi-band compensation mirror 1 (L31) and a multi-band compensation mirror 2 (L32) which are sequentially arranged along the incident direction of the light beam; the multi-band compensation mirror 1 (L31) and the multi-band compensation mirror 2 (L32) are arranged between the secondary mirror (L2) and the first reflecting mirror (L4); the multi-band compensation mirror 1 (L31) is a meniscus spherical lens with positive optical focal length, and the multi-band compensation mirror 2 (L32) is a meniscus spherical lens with negative optical focal length.

6. The three-band common aperture multifunctional optical system according to claim 5, characterized in that: The medium-wave infrared lens group (L7) comprises a medium-wave infrared first lens (L71), a medium-wave infrared second lens (L72), a medium-wave infrared third lens (L73), a medium-wave infrared folding mirror (L74), a medium-wave infrared fourth lens (L75), a medium-wave infrared fifth lens (L76), a medium-wave infrared sixth lens (L77), a medium-wave infrared detector window (L78) and a medium-wave infrared detector filter (L79) which are sequentially arranged along the incident direction of the medium-wave infrared light beam.

7. The three-band common aperture multifunctional optical system according to claim 6, characterized in that: The laser and short-wave infrared common lens group (L9) comprises a laser and short-wave infrared common first lens (L91), a laser and short-wave infrared common second lens (L92) and a laser and short-wave infrared common third lens (L93) which are sequentially arranged along the incident direction of the short-wave infrared light beam; the laser and short-wave infrared common first lens (L91) is a meniscus spherical lens with positive focal length, the laser and short-wave infrared common second lens (L92) is a meniscus spherical lens with positive focal length, and the laser and short-wave infrared common third lens (L93) is a biconvex spherical lens with positive focal length.

8. The three-band common aperture multifunctional optical system according to claim 7, characterized in that: The laser emission mirror group (L11) includes a laser emission first lens (L111), a laser emission second lens (L112), a laser emission third lens (L113), a laser emission first folding mirror (L114), a laser emission fourth lens (L115), a laser emission fifth lens (L116), a laser emission sixth lens (L117) and a laser emission seventh lens (L118) which are sequentially arranged along the laser emission direction.

9. The three-band common aperture multifunctional optical system according to claim 8, characterized in that: The short-wave infrared lens group (L12) comprises a short-wave infrared first cemented lens (L121), a short-wave infrared second cemented lens (L122), a short-wave infrared first lens (L123), a short-wave infrared first folding mirror (L124), a short-wave infrared second lens (L125), and a short-wave infrared second folding mirror (L126) which are sequentially arranged along the incident direction of the short-wave infrared light beam; the short-wave infrared first cemented lens (L121) is a double-cemented lens with negative optical focal length; the short-wave infrared first cemented lens (L121) comprises a short-wave infrared first cemented lens 1 (L1211) and a short-wave infrared first cemented lens 2 (L1212) which are sequentially arranged along the incident direction of the short-wave infrared light beam; The short-wave infrared second glued lens (L122) is a double glued lens with positive focal length. The short-wave infrared second glued lens (L122) comprises a short-wave infrared second glued lens 1 (L1221) and a short-wave infrared second glued lens 2 (L1222) which are sequentially arranged along the incident direction of the short-wave infrared light beam. The short-wave infrared first lens (L123) is a meniscus spherical lens with positive focal length. The short-wave infrared first folding mirror (L124) is a plane reflector placed at an angle of 45° to the horizontal plane. The short-wave infrared second lens (L125) is a meniscus spherical lens with positive focal length. The short-wave infrared second folding mirror (L126) is a plane reflector placed at an angle of 45° to the horizontal plane.

Images