Laser / infrared composite all-round warning device

Abstract

The application discloses a laser / infrared composite all-round warning device, and belongs to the technical field of laser / infrared all-round detection and warning. The laser warning optical system and the infrared warning optical system share a main mirror and a secondary mirror, the secondary mirror is used as a laser / infrared beam splitter, transmits laser and reflects infrared waves at the same time, the laser warning optical system is sequentially arranged with the main mirror, the secondary mirror, a first laser objective lens, a second laser objective lens, a third laser objective lens and a laser detector along a positive direction of an optical axis, and the infrared warning optical system is sequentially arranged with the main mirror, the secondary mirror, a first infrared objective lens, a second infrared objective lens, a third infrared objective lens, a fourth infrared objective lens, a fifth infrared objective lens and an infrared detector along a negative direction of the optical axis; the laser warning optical system and the infrared warning optical system share a ring scene field of view of the system, and a detection field of view is a lateral pitch range of -10° to +40° and a bearing range of 360°. The application improves the comprehensive degree of the system and reduces the size of the system.

Description

Technical Field

[0001] This invention belongs to the field of laser / infrared panoramic detection and alarm technology, and specifically relates to a laser / infrared composite panoramic alarm device. Background Technology

[0002] Laser / infrared detection and warning devices are high-efficiency, modern reconnaissance tools widely used in the field of detection and sensing. They are particularly vulnerable in low-speed detection scenarios involving helicopters and missile launchers, where laser guidance poses a significant threat. Laser / infrared composite warning devices provide comprehensive situational awareness, detect and warn of incoming laser-guided attacks, determine target location, and help detection personnel take timely countermeasures.

[0003] Laser / infrared detection and alarm technology detects and detects incoming objects by sensing their infrared target characteristics and laser information. This allows for the determination of the incoming threat source's location, speed, and distance, assessing the threat level and intent, and providing alarm information to inform appropriate countermeasures. The core research focus of alarm detection technology is achieving multi-band detection of incoming objects with minimal space constraints.

[0004] Currently, most widely deployed laser and infrared detection alarm devices are independent detection units, and their technical approach often employs a wide-angle lens design. This approach suffers from drawbacks such as large system size due to system independence, complex cross-linking between laser and infrared sensors, and field-of-view obstruction between independent units. Therefore, there is an urgent need to design a composite alarm device with a shared laser / infrared aperture to provide a 360° surround detection field of view and laser / infrared composite alarm capability. Summary of the Invention

[0005] The technical problem to be solved:

[0006] To overcome the shortcomings of existing technologies, this invention provides a laser / infrared composite panoramic alarm device, offering a laser / infrared dual-band common aperture alarm technology solution within a limited space. The laser / infrared composite panoramic alarm device employs a catadioptric common aperture design, where the laser and infrared optical systems share a primary and secondary mirror. The secondary mirror acts as a dual-band beam splitter, with the laser and infrared optical systems arranged sequentially on either side of the primary and secondary mirrors. This dual-band panoramic common aperture optical system design enables integrated laser / infrared alarm functionality, achieving the required 360° surround detection performance, improving system integration, and reducing system size.

[0007] The technical solution of this invention is: a laser / infrared composite panoramic alarm device, comprising a laser alarm optical system and an infrared alarm optical system sharing a primary mirror and a secondary mirror. The secondary mirror serves as a laser / infrared beam splitter, transmitting laser light while reflecting infrared light. The laser alarm optical system is arranged sequentially along the positive direction of the optical axis, comprising a primary mirror, a secondary mirror, a first laser objective lens, a second laser objective lens, a third laser objective lens, and a laser detector. The infrared alarm optical system is arranged sequentially along the negative direction of the optical axis, comprising the primary mirror, the secondary mirror, a first infrared objective lens, a second infrared objective lens, a third infrared objective lens, a fourth infrared objective lens, a fifth infrared objective lens, and an infrared detector.

[0008] The laser alarm optical system and the infrared alarm optical system share the system's panoramic field of view, with the detection field of view being the optical axis lateral elevation range of -10° to +40° and the azimuth 360° area.

[0009] A further technical solution of the present invention is as follows: the primary mirror and the secondary mirror are the common aperture portion of the laser alarm optical path and the infrared alarm optical path. The primary mirror is an elliptical surface with a central opening and a specific radius of curvature. The substrate material is aluminum or other optical materials. The secondary mirror has the characteristics of reflecting infrared bands and transmitting laser bands. The reflecting surface is a hyperboloid with a specific radius of curvature, and the rear surface is a concave lens with a specific radius of curvature. The material is optical glass.

[0010] A further technical solution of the present invention is as follows: the parameters of the laser optical system are: working band 1.064μm, F number 1, focal length 3mm; the parameters of the infrared optical system are: working band 3μm~5μm, F number 1.4, focal length 6.86mm; the alarm field of view of the whole system is: pitch -10°~+40°, azimuth 360°.

[0011] A further technical solution of the present invention is: the primary mirror is an elliptical surface with a light-transmitting aperture of 130mm, a central opening diameter of 54mm, and a reflective surface curvature radius of 73.5mm, and its material is quartz glass.

[0012] A further technical solution of the present invention is: the secondary mirror is 60mm apart from the primary mirror, the light-transmitting aperture is 92mm, the front surface is semi-transparent and semi-reflective, transmitting laser light and reflecting infrared light, the surface shape is hyperboloid with a radius of curvature of 173.374mm, the rear surface has a radius of curvature of -8.892mm, and its material is Chengdu Guangming HK9L.

[0013] A further technical solution of the present invention is: the first laser objective lens and the secondary lens are spaced 10mm apart, the focal length is 63.2mm, the light-transmitting aperture is 12mm, the front surface curvature radius is 8.28mm, the rear surface curvature radius is 15.21mm, and the material is Chengdu Guangming HLAK53.

[0014] The second laser objective lens is 7.74 mm apart from the first laser objective lens, has a focal length of -35.25 mm, a light-transmitting aperture of 32.6 mm, a front surface curvature radius of -34.137 mm, a rear surface curvature radius of 55.398 mm, and is made of Chengdu Guangming HLAK10.

[0015] The third laser objective lens is 0.265 mm apart from the second laser objective lens, has a focal length of -40.44 mm, a light-transmitting aperture of 29.8 mm, a front surface curvature radius of -43.886 mm, a rear surface curvature radius of 79.676 mm, and is made of Chengdu Guangming HZF6.

[0016] A further technical solution of the present invention is: the laser detector is 25.4 mm away from the third laser objective along the positive direction of the optical axis, and its photosensitive surface is located at the focal plane of the laser alarm optical system. The laser detector is selected as a PIN photodiode or a CMOS covering the laser detection band.

[0017] A further technical solution of the present invention is: the first infrared objective lens and the secondary lens are spaced 50mm apart, the focal length is -26.4mm, the light-transmitting aperture is 28mm, the front surface curvature radius is -33.29mm, the rear surface curvature radius is -86.638mm, and the material is single crystal silicon;

[0018] The second infrared objective lens is 5.93 mm apart from the first infrared objective lens, has a focal length of -26.486 mm, a light-transmitting aperture of 44 mm, a front surface curvature radius of -30.29 mm, a rear surface curvature radius of -66.833 mm, and is made of single-crystal germanium.

[0019] The third infrared objective lens is 1 mm apart from the second infrared objective lens, has a focal length of 50.48 mm, a light-transmitting aperture of 55 mm, a front surface curvature radius of -93.819 mm, a rear surface curvature radius of -44.525 mm, and is made of zinc selenide.

[0020] The fourth infrared objective lens is 1 mm apart from the third infrared objective lens, has a focal length of -2830 mm, a light-transmitting aperture of 54 mm, a front surface curvature radius of 55.614 mm, a rear surface curvature radius of 50.54 mm, and is made of magnesium fluoride.

[0021] The fifth infrared objective lens is 3mm apart from the fourth infrared objective lens, has a focal length of 35.278mm, a light-transmitting aperture of 52mm, a front surface curvature radius of 51.1mm, and a rear surface curvature radius of 114.56mm. Its material is single-crystal silicon.

[0022] A further technical solution of the present invention is: the infrared detector is 17.65 mm away from the fifth infrared objective lens along the negative direction of the optical axis, and its detector image plane is located at the focal plane of the infrared alarm optical system. The infrared detector is selected as either a cooled infrared detector or an uncooled infrared detector.

[0023] A further technical solution of the present invention is: the total length of the laser / infrared composite panoramic alarm device is ≤200mm.

[0024] Beneficial effects

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention adopts a laser / infrared co-aperture optical system design, covering dual detection bands, with a panoramic alarm field of view, an elevation field of view of -10° to +40°, and a 360° azimuth field of view;

[0027] 2. The dual-band optical system of this invention has a compact optical path, a total system length of ≤200mm, and consists of only 2 reflectors and 8 lenses. It can be matched with a 2K resolution infrared detector to achieve high infrared resolution.

[0028] 3. This invention realizes the integrated and miniaturized design of a laser / infrared composite alarm system for use in dual-band alarm optoelectronic products. Compared with existing technologies, it improves the composite and comprehensive alarm functions, and has multiple functions such as alarm, monitoring, and situational awareness.

[0029] 4. The laser / infrared composite panoramic alarm device described in this invention can be applied to police security, composite alarms, and reconnaissance. It has the advantages of multiple detection spectral bands, a large field of view, high resolution, and composite information processing capabilities. Even under spatially limited conditions, it can effectively achieve high-resolution, multi-spectral information threat situational awareness, improving the survivability of equipment and vehicles. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the laser / infrared composite panoramic alarm device of the present invention.

[0031] Figure 2 This is a diagram of the laser optical system of the laser / infrared composite panoramic alarm device of the present invention.

[0032] Figure 3 This is a diagram of the infrared optical system of the laser / infrared composite panoramic alarm device of the present invention.

[0033] Figure 4 This is a schematic diagram of the alarm field of view of the laser / infrared composite panoramic alarm device of the present invention.

[0034] Explanation of reference numerals in the attached figures: 1. Primary mirror, 2. Secondary mirror, 3. First laser objective, 4. Second laser objective, 5. Third laser objective, 6. Laser detector, 7. First infrared objective, 8. Second infrared objective, 9. Third infrared objective, 10. Fourth infrared objective, 11. Fifth infrared objective, 12. Infrared detector. Detailed Implementation

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0036] Existing laser and infrared detection alarm devices, which are widely used in current technology, are mostly independent detection units. Their technical approach often employs wide-angle lens designs. This approach suffers from drawbacks such as large system size due to their independence, complex cross-linking between laser and infrared sensors, and field-of-view obstruction between independent units. This invention provides a laser / infrared composite panoramic alarm device, comprising a primary mirror 1, a secondary mirror 2, a first laser objective lens 3, a second laser objective lens 4, a third laser objective lens 5, a laser detector 6, a first infrared objective lens 7, a second infrared objective lens 8, a third infrared objective lens 9, a fourth infrared objective lens 10, a fifth infrared objective lens 11, and an infrared detector 12. The primary mirror 1, secondary mirror 2, first laser objective lens 3, second laser objective lens 4, third laser objective lens 5, and laser detector 6 are arranged sequentially along the positive optical axis to form a laser alarm optical system. The primary mirror 1, secondary mirror 2, first infrared objective lens 7, second infrared objective lens 8, third infrared objective lens 9, fourth infrared objective lens 10, fifth infrared objective lens 11, and infrared detector 12 are arranged sequentially along the negative optical axis to form an infrared alarm optical system. The laser alarm optical system and the infrared alarm optical system share the same aperture design, sharing the primary mirror 1 and secondary mirror 2. The secondary mirror 2 acts as a laser / infrared beam splitter, transmitting laser light while reflecting infrared light. The laser alarm optical system and the infrared alarm optical system share the system's panoramic field of view, with a detection field of view covering a lateral elevation range of -10° to +40° and an azimuth range of 360°. This laser / infrared composite panoramic alarm device can be applied in security, composite alarm, and reconnaissance fields. It has the advantages of multiple detection spectrum bands, a large field of view, high resolution, and composite information processing capabilities. It can effectively achieve high-resolution, multi-spectral threat situation awareness under spatially limited conditions, thereby improving the battlefield survivability of equipment and vehicles.

[0037] The above technical solution will be further explained below with reference to the accompanying drawings.

[0038] Reference Figure 1 As shown, the primary mirror 1, secondary mirror 2, first laser objective lens 3, second laser objective lens 4, third laser objective lens 5, and laser detector 6 are arranged sequentially along the positive direction of the optical axis to form a laser alarm optical system; the primary mirror 1, secondary mirror 2, first infrared objective lens 7, second infrared objective lens 8, third infrared objective lens 9, fourth infrared objective lens 10, fifth infrared objective lens 11, and infrared detector 12 are arranged sequentially along the negative direction of the optical axis to form an infrared alarm optical system.

[0039] The primary mirror 1 and secondary mirror 2 are the shared aperture sections of the laser alarm optical path and the infrared alarm optical path. The primary mirror 1 is an elliptical surface, typically with a centrally drilled hole, and is a reflector with a specific radius of curvature. The substrate material is aluminum or other optical materials. The secondary mirror 2 is characterized by reflecting infrared wavelengths and transmitting laser wavelengths. The reflecting surface is typically a hyperboloid with a specific radius of curvature, and the rear surface is typically a concave lens with a specific radius of curvature. The material is optical glass.

[0040] Specifically, the laser / infrared composite panoramic alarm device adopts a panoramic laser / infrared common aperture optical system design. Laser optical system: operating wavelength 1.064μm, F-number 1, focal length 3mm; Infrared optical system: operating wavelength 3μm~5μm, F-number 1.4, focal length 6.86mm; Total alarm field of view: elevation -10°~+40°, azimuth 360°.

[0041] Reference Figure 2 As shown, the first laser objective lens 3, the second laser objective lens 4, and the third laser objective lens 5 are arranged sequentially along the positive direction of the optical axis. The first laser objective lens 3, the second laser objective lens 4, and the third laser objective lens 5 are typically positive / negative lenses with concave or convex surfaces and specific intervals and radii of curvature, possessing high transmittance in the laser band, and made of optical glass. The laser detector 6 is arranged adjacent to the third laser objective lens 5 along the positive direction of the optical axis, with its photosensitive surface located at the focal plane of the laser alarm optical system. The laser detector 6 is typically a PIN photodiode or a CMOS covering the laser detection band.

[0042] The laser detection optical system in the laser / infrared composite panoramic alarm device includes a primary mirror 1, a secondary mirror 2, a first laser objective lens 3, a second laser objective lens 4, a third laser objective lens 5, and a laser detector 6.

[0043] Specifically, the primary mirror 1 has an elliptical surface, a light-transmitting aperture of 130mm, a central opening diameter of 54mm, a reflective surface curvature radius of 73.5mm, and its material is quartz glass;

[0044] Specifically, the secondary mirror 2 is 60mm apart from the primary mirror 1, has a light-transmitting aperture of 92mm, a semi-transparent and semi-reflective front surface that transmits laser light and reflects infrared light, a hyperboloidal surface with a radius of curvature of 173.374mm, and a rear surface with a radius of curvature of -8.892mm. Its material is Chengdu Guangming HK9L.

[0045] Specifically, the first laser objective lens 3 is 10mm apart from the secondary lens 2, with a focal length of 63.2mm, a light-transmitting aperture of 12mm, a front surface curvature radius of 8.28mm, a rear surface curvature radius of 15.21mm, and its material is Chengdu Guangming HLAK53.

[0046] Specifically, the second laser objective lens 4 is 7.74 mm apart from the first laser objective lens 3, has a focal length of -35.25 mm, a light-transmitting aperture of 32.6 mm, a front surface curvature radius of -34.137 mm, a rear surface curvature radius of 55.398 mm, and is made of Chengdu Guangming HLAK10.

[0047] Specifically, the distance between the third laser objective lens 5 and the second laser objective lens 4 is 0.265mm, the focal length is -40.44mm, the aperture is 29.8mm, the front surface curvature radius is -43.886, the rear surface curvature radius is 79.676mm, and the material is Chengdu Guangming HZF6.

[0048] Specifically, the laser detector 6 and the third laser objective lens 5 are spaced 25.4 mm apart, and can be a PIN photodiode or a CMOS detector with laser detection function.

[0049] Reference Figure 3 As shown, the first infrared objective lens 7, the second infrared objective lens 8, the third infrared objective lens 9, the fourth infrared objective lens 10, and the fifth infrared objective lens 11 pass through the central hole of the main mirror 1 and are arranged sequentially along the negative direction of the system's optical axis. They are typically positive / negative lenses with concave or convex surfaces and specific intervals and radii of curvature, possessing high transmittance in the infrared band, and the optical material is an infrared crystal. The infrared detector 12 is arranged adjacent to the fifth infrared objective lens 11 along the positive direction of the optical axis, and its detector image plane is located at the focal plane of the infrared alarm optical system. The infrared detector 12 is typically a cooled or uncooled infrared detector.

[0050] Specifically, the primary mirror 1 and the secondary mirror 2 share the same optical path with the laser optical system. The secondary mirror 2 transmits laser light and reflects infrared light. The first infrared objective lens 7 is 50mm apart from the secondary mirror 2, has a focal length of -26.4mm, a light-transmitting aperture of 28mm, a front surface curvature radius of -33.29mm, a rear surface curvature radius of -86.638mm, and its material is single-crystal silicon.

[0051] Specifically, the second infrared objective lens 8 is spaced 5.93 mm from the first infrared objective lens 7, has a focal length of -26.486 mm, a light-transmitting aperture of 44 mm, a front surface curvature radius of -30.29 mm, a rear surface curvature radius of -66.833 mm, and is made of single-crystal germanium.

[0052] Specifically, the third infrared objective lens 9 is 1 mm apart from the second infrared objective lens 8, the focal length is 50.48 mm, the aperture is 55 mm, the front surface curvature radius is -93.819, the rear surface curvature radius is -44.525 mm, and the material is zinc selenide.

[0053] Specifically, the fourth infrared objective lens 10 is spaced 1 mm from the third infrared objective lens 9, has a focal length of -2830 mm, a light-transmitting aperture of 54 mm, a front surface curvature radius of 55.614 mm, a rear surface curvature radius of 50.54 mm, and is made of magnesium fluoride.

[0054] Specifically, the fifth infrared objective lens 11 is 3mm apart from the fourth infrared objective lens 10, the focal length is 35.278mm, the aperture is 52mm, the front surface curvature radius is 51.1mm, the rear surface curvature radius is 114.56mm, and the material is single crystal silicon.

[0055] Specifically, the distance between the infrared detector 12 and the fifth infrared objective lens 11 is 17.65 mm, and it can be a HgCdTe or InAs cooled detector.

[0056] The above technical solution is described in detail below through specific implementation examples:

[0057] like Figure 1 As shown, the specific parameters of the laser / infrared composite panoramic alarm device are as follows:

[0058] (I) Laser Alarm Optical System:

[0059] Focal length: f = 3mm;

[0060] F-number: 1;

[0061] Operating wavelength: 1.064μm;

[0062] Warning field of view: Pitch -10° to +40°, Azimuth 360°.

[0063] Table 1 shows the specific parameters of the laser alarm optical system. (See also...) Figure 2 The laser alarm optics adopts a catadioptric optical path configuration. The primary mirror 1 has an elliptical surface, and the secondary mirror 2 has a hyperboloid surface. The laser light path passes through the secondary mirror 2 and then sequentially through the first laser objective lens 3, the second laser objective lens 4, and the third laser objective lens 5, which are respectively a concave lens, a convex lens, and a convex lens, and are made of HLAK53, HLAK10, and HZF6 materials, respectively.

[0064] Table 1:

[0065]

[0066]

[0067] (II) Infrared Alarm Optical System:

[0068] Focal length: f = 6.86mm;

[0069] F-number: 1.4;

[0070] Operating wavelength: 3μm~5μm;

[0071] Warning field of view: Pitch -10° to +40°, Azimuth 360°.

[0072] Detector pixel size: 10μm × 10μm

[0073] Effective pixels: 2048(H)×2048(V)

[0074] Table 2 lists the specific parameters of the infrared alarm optical system. (See also...) Figure 3 The infrared alarm optics and laser alarm optics systems share a primary mirror 1 and a secondary mirror 2. The secondary mirror 2 reflects the infrared light path, which passes sequentially through the first infrared objective 7, the second infrared objective 8, the third infrared objective 9, the fourth infrared objective 10, and the fifth infrared objective 11. These are respectively a concave lens, a concave lens, a convex lens, a concave lens, and a convex lens, and the materials are single-crystal silicon, single-crystal germanium, zinc selenide, magnesium fluoride, and single-crystal silicon.

[0075] Table 2:

[0076]

[0077]

[0078] Figure 4 This is a schematic diagram of the alarm field of view of the laser / infrared composite panoramic alarm device of the present invention. From... Figure 4 As can be seen, the present invention has a panoramic detection field of view with an elevation range of -10° to +40° and an azimuth range of 360°.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A laser / infrared composite panoramic alarm device, characterized in that: The system includes a laser alarm optical system and an infrared alarm optical system that share a primary mirror and a secondary mirror. The secondary mirror acts as a laser / infrared beam splitter, transmitting laser light while reflecting infrared light. The laser alarm optical system consists of a primary mirror, a secondary mirror, a first laser objective lens, a second laser objective lens, a third laser objective lens, and a laser detector arranged sequentially along the positive optical axis. The infrared alarm optical system consists of the primary mirror, a secondary mirror, a first infrared objective lens, a second infrared objective lens, a third infrared objective lens, a fourth infrared objective lens, a fifth infrared objective lens, and an infrared detector arranged sequentially along the negative optical axis. The first laser objective lens is 10mm apart from the secondary lens, has a focal length of 63.2mm, a light-transmitting aperture of 12mm, a front surface curvature radius of 8.28mm, a rear surface curvature radius of 15.21mm, and is made of Chengdu Guangming HLAK53. The second laser objective lens is 7.74 mm apart from the first laser objective lens, has a focal length of -35.25 mm, a light-transmitting aperture of 32.6 mm, a front surface curvature radius of -34.137 mm, a rear surface curvature radius of 55.398 mm, and is made of Chengdu Guangming HLAK10. The third laser objective lens is 0.265mm apart from the second laser objective lens, has a focal length of -40.44mm, a light-transmitting aperture of 29.8mm, a front surface curvature radius of -43.886, a rear surface curvature radius of 79.676mm, and is made of Chengdu Guangming HZF6. The laser alarm optical system and the infrared alarm optical system share the system's panoramic field of view, with the detection field of view being the optical axis lateral elevation range of -10° to +40° and the azimuth 360° area.

2. The laser / infrared composite panoramic alarm device according to claim 1, characterized in that: The primary mirror and secondary mirror are the common aperture sections of the laser alarm optical path and the infrared alarm optical path. The primary mirror is an elliptical surface with a central opening and a specific radius of curvature, and the substrate material is aluminum or other optical materials. The secondary mirror has the characteristics of reflecting infrared bands and transmitting laser bands. The reflecting surface is a hyperboloid with a specific radius of curvature, and the rear surface is a concave lens with a specific radius of curvature. The material is optical glass.

3. The laser / infrared composite panoramic alarm device according to claim 2, characterized in that: The parameters of the laser optical system are: working wavelength 1.064μm, F number 1, focal length 3mm; the parameters of the infrared optical system are: working wavelength 3μm~5μm, F number 1.4, focal length 6.86mm; the alarm field of view of the whole system is: pitch -10°~+40°, azimuth 360°.

4. The laser / infrared composite panoramic alarm device according to claim 3, characterized in that: The primary mirror has an elliptical surface, a light-transmitting aperture of 130mm, a central opening diameter of 54mm, and a reflective surface curvature radius of 73.5mm. Its material is quartz glass.

5. The laser / infrared composite panoramic alarm device according to claim 4, characterized in that: The secondary mirror is 60mm apart from the primary mirror, with a light-transmitting aperture of 92mm. Its front surface is semi-transparent and semi-reflective, transmitting laser light and reflecting infrared light. It has a hyperboloidal surface with a radius of curvature of 173.374mm and a rear surface with a radius of curvature of -8.892mm. Its material is Chengdu Guangming HK9L.

6. The laser / infrared composite panoramic alarm device according to claim 5, characterized in that: The laser detector is 25.4 mm away from the third laser objective along the positive optical axis, and its photosensitive surface is located at the focal plane of the laser alarm optical system. The laser detector is a PIN photodiode or a CMOS covering the laser detection band.

7. The laser / infrared composite panoramic alarm device according to claim 5, characterized in that: The first infrared objective lens is 50mm apart from the secondary lens, has a focal length of -26.4mm, a light-transmitting aperture of 28mm, a front surface curvature radius of -33.29mm, a rear surface curvature radius of -86.638mm, and is made of single-crystal silicon. The second infrared objective lens is 5.93 mm apart from the first infrared objective lens, has a focal length of -26.486 mm, a light-transmitting aperture of 44 mm, a front surface curvature radius of -30.29 mm, a rear surface curvature radius of -66.833 mm, and is made of single-crystal germanium. The third infrared objective lens is 1 mm apart from the second infrared objective lens, has a focal length of 50.48 mm, a light-transmitting aperture of 55 mm, a front surface curvature radius of -93.819 mm, a rear surface curvature radius of -44.525 mm, and is made of zinc selenide. The fourth infrared objective lens is 1 mm apart from the third infrared objective lens, has a focal length of -2830 mm, a light-transmitting aperture of 54 mm, a front surface curvature radius of 55.614 mm, a rear surface curvature radius of 50.54 mm, and is made of magnesium fluoride. The fifth infrared objective lens is 3mm apart from the fourth infrared objective lens, has a focal length of 35.278mm, a light-transmitting aperture of 52mm, a front surface curvature radius of 51.1mm, and a rear surface curvature radius of 114.56mm. Its material is single-crystal silicon.

8. The laser / infrared composite panoramic alarm device according to claim 7, characterized in that: The infrared detector is 17.65 mm away from the fifth infrared objective lens along the negative direction of the optical axis. Its detector image plane is located at the focal plane of the infrared alarm optical system. The infrared detector is either a cooled infrared detector or an uncooled infrared detector.

9. A laser / infrared composite panoramic alarm device according to any one of claims 1-8, characterized in that: The total length of the laser / infrared composite panoramic alarm device is ≤200mm.

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