CN115313128B - Interference system based on multispectral mid-wave infrared picosecond all-fiber laser - Google Patents
Interference system based on multispectral mid-wave infrared picosecond all-fiber laser Download PDFInfo
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- CN115313128B CN115313128B CN202210792450.3A CN202210792450A CN115313128B CN 115313128 B CN115313128 B CN 115313128B CN 202210792450 A CN202210792450 A CN 202210792450A CN 115313128 B CN115313128 B CN 115313128B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/0007—Applications not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D45/00—Aircraft indicators or protectors not otherwise provided for
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
Abstract
The invention provides an interference system based on a multispectral mid-wave infrared picosecond all-fiber laser, which comprises the following parts: the system comprises a multispectral mid-wave infrared picosecond all-fiber laser, a light guide device group, an infrared imaging system and a power supply control system. The multi-spectral mid-wave infrared picosecond all-fiber laser outputs mid-wave infrared laser collimated beams, multi-path laser fusion is realized through the light guide device group, the irradiation interference infrared imaging system is irradiated, and the power supply control system can regulate and control laser power, irradiation time and working angle. The invention utilizes the characteristics of high output repetition frequency, wide spectrum range, strong environmental stability, small volume, good portability and the like of the multi-spectrum mid-wave infrared picosecond all-fiber laser, controls the laser interference efficiency through the light path system and the control system, causes controllable damage to a target, and realizes a diversified laser interference system with controllable irradiation time, low interference damage threshold value and adjustable distance angle.
Description
Technical Field
The invention belongs to the laser interference technology, and relates to an interference system based on a multispectral mid-wave infrared picosecond all-fiber laser.
Background
The laser directly damages or fails the target by utilizing the strong laser beam emitted directionally, and has the advantages of quick response, little external interference, quick firepower transfer, no recoil, no radioactive pollution, continuous shooting and simultaneous interception of a plurality of targets. The laser can rapidly change the shooting direction through the internal beam control system, intercept a plurality of incoming targets in a short time, and the laser beam damage can more effectively meet the photoelectric countermeasure requirement.
Because the mid-wave infrared is positioned in the atmospheric window band, the wavelength has very small extinction when being positioned in the atmosphere, and the transmittance is very high even under severe conditions, therefore, the mid-wave infrared pulse laser source is applied to various fields such as laser countermeasure, radar detection, laser guidance, communication and the like. At present, continuous wave, short wave infrared laser, medium wave solid laser and the like are mostly adopted for interference damage of the medium infrared detector, and the following defects exist: the medium wave solid laser outputs nanosecond magnitude more, the laser system has the problems of huge volume, compact structure, poor environmental adaptability, and the like, and the practical application is lacking; the short wave infrared laser is out of band of the intermediate wave infrared detector, photon energy is lower than forbidden bandwidth, most of the output wavelengths are single, the short wave infrared laser can only fall in a certain range of the intermediate wave infrared imaging system, and the threshold value of interference damage is higher. How to more quickly and variously interfere with damage detectors is a current urgent problem to be solved.
Disclosure of Invention
The invention provides an interference system based on a multispectral mid-wave infrared picosecond all-fiber laser, which aims to solve the problems of huge volume, poor environmental stability, single output wavelength, high interference damage threshold and to be improved in practical use of the existing laser irradiation light source.
In order to achieve the above purpose, the system of the invention is realized by the following technical scheme: an interference system based on a multi-band mid-wave infrared picosecond all-fiber laser, comprising: the device comprises four parts of a multi-spectrum mid-wave infrared picosecond all-fiber laser, a light guide device group, an infrared imaging system and a power supply control system.
The multi-spectrum mid-wave infrared picosecond all-fiber laser generates multi-spectrum picosecond pulse mid-infrared laser output. The multi-spectrum mid-wave infrared picosecond all-fiber laser also comprises a multi-spectrum mid-wave infrared picosecond all-fiber amplifier, a fixed clamp, an end cap with an optical fiber tail fiber, a collimating lens, a pitching adjusting device and an azimuth adjusting device. The multi-band medium wave infrared picosecond all-fiber amplifier generates multi-band medium wave infrared laser, outputs pulse width of picosecond and performs interference on the infrared detector; the fixed clamp holder is used for fixing the end cap with the optical fiber tail fiber, is connected with the pitching adjusting device and the azimuth adjusting device and can do pitching rotation and azimuth rotation; the collimating lens is connected with the pitching adjusting device and the azimuth adjusting device, and the outgoing optical axes of the laser are the same with the outgoing optical axes of the laser of the multispectral mid-wave infrared picosecond all-fiber amplifier and the end cap with the fiber tail fiber through rotation, and output laser is collimated. The light guide device group comprises different membrane system spectroscopes, a focusing mirror and a beam combining mirror, can split and combine laser beams of a multispectral section, realizes interference damage of any laser combination, can adjust the focal distance and the position of the focusing mirror, changes the size of a laser spot and the power density of the laser, and realizes diversified laser interference damage by matching with the pitching adjusting device and the azimuth adjusting device. The lens frame supports of the collimating lens, the spectroscope, the focusing lens and the beam combining lens are respectively provided with a cable interface, are connected with a bearing and a motor, and finish rotary motion under the control of control signals, so that laser interference in any direction is realized.
The infrared imaging system comprises an infrared detector and an imaging system. The infrared detector is used for detecting and collecting infrared radiation signals and converting the infrared radiation signals into electric signals for effective detection. The imaging system is provided with a corresponding infrared image imaging system, interference effect diagrams under different laser parameters can be acquired in real time, imaging effects after interference are observed in real time, and interference damage threshold values and interference damage conditions are evaluated and judged. The power supply control system comprises a control system and a power supply system. The control system is used for controlling the output power and the irradiation time of the multi-spectrum mid-wave infrared picosecond all-fiber amplifier, and simultaneously controlling the pitching adjusting device and the azimuth adjusting device to ensure that the laser emergent direction is consistent with the lens optical axis, and controlling the size of a focusing light spot so as to realize the interference of different properties on a target. The power supply system is used for supplying power to the control system and the multispectral mid-wave infrared picosecond all-fiber laser, so that effective operation is ensured.
Preferably, the multi-spectrum mid-wave infrared picosecond all-fiber laser also comprises a water chiller and a temperature control system, which are used for cooling the laser and ensuring the stable operation of the high-power laser. A water pipe is connected between the water chiller and the multi-spectral mid-wave infrared picosecond all-fiber amplifier, the water pipe inputs the refrigerant generated by the water chiller to a water cooling device of the laser multi-spectral mid-wave infrared picosecond all-fiber amplifier, and returns the refrigerant in the water cooling device to the water chiller to form a refrigerating loop. The temperature control system is used for accurately controlling temperature and guaranteeing stability of the system.
Preferably, the multi-spectrum mid-wave infrared picosecond all-fiber laser is provided with a directional control module, and the directional control module comprises a directional motor, and the directional control module synchronously indicates the interference process of the detector by the laser emitted by the multi-spectrum mid-wave infrared picosecond all-fiber laser and is used for controlling the change of the irradiation angle of the laser. The laser pointing control module is characterized by further comprising a closed-loop feedback module, wherein the closed-loop feedback module drives the pitching adjusting device and the azimuth adjusting device after the corresponding angle value is adjusted by the laser pointing control module, so that the laser emergent light is coaxial, and the positioning precision is improved.
Preferably, the lens of the light guide device group is connected with a driving device, and the driving device is used for driving the lens to rotate so as to realize interference of different laser parameters.
Preferably, the pitch adjusting device and the azimuth adjusting device are respectively provided with a bearing, a motor and an angle measuring element, and the rotation movement in different directions is completed under the control of control signals, so that the laser interference in any direction is realized.
Preferably, the control system comprises a data processing module which receives data and issues instructions. The data processing module sends an instruction to the pointing control module, controls the laser to adjust the emergent angle, adjusts zooming according to the distance value, enables the zooming of the laser spots to be adjusted to a proper size, and achieves accurate interference of the infrared detector; the laser control module regulates and controls the laser according to the data received by the data processing module, so that laser beams emitted by the laser are modulated by light intensity and divergence angle, and the infrared detectors are irradiated by different time, so that the infrared detectors are continuously over-exposed, and detector interference is realized.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that:
1. the invention integrates the multi-band medium wave infrared picosecond all-fiber laser into a set of optical system by utilizing the flexible property of the optical fiber, and selects the working mode of the interference system by controlling the parameters of the light source and the switching of the light guide system; the system shares a set of light source, power supply equipment, a heat radiation system and the like, greatly reduces the volume and the power consumption, does not increase the whole weight of the system while increasing the laser interference damage function, further lightens the load of the aircraft, and ensures the maneuvering performance and the fight performance of the aircraft.
2. The invention is used for laser infrared interference, can divide incident laser into multiple paths according to wavelength, can dynamically adjust laser parameters of each path, and can realize different paths of laser fusion interference and diversified interference. Because the laser emergent optical axis is consistent with the optical axis of the infrared detector lens, the system can observe interference phenomenon and effect in real time, and the experimental result can be suitable for long-distance laser interference.
Drawings
FIG. 1 is a schematic diagram of a multi-band mid-wave infrared picosecond all-fiber laser interference infrared imaging system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the mid-wave infrared picosecond all-fiber laser in the multispectral region of FIG. 1;
FIG. 3 is a schematic diagram of the light guiding device set in FIG. 1;
FIG. 4 is a schematic diagram of the infrared imaging system of FIG. 1;
FIG. 5 is a schematic diagram of the power control system of FIG. 1;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The laser which interferes with the infrared detector in the actual national defense application generally utilizes a medium wave solid laser and a continuous laser, and the laser has poor environmental stability and larger volume, and is difficult to meet the requirements of on-board, vehicle-mounted and the like. Therefore, an all-fiber laser is adopted, on one hand, the fiber laser is insensitive to external factors, and on the other hand, the fiber laser has strong resistance to external factors in the space transmission process, so that the anti-interference capability of the fiber laser is improved. However, the output wavelength of the existing medium-wave infrared fiber laser is single, and the diversified interference of multi-path laser fusion is difficult to realize. Meanwhile, because the action mechanism of the ultra-short pulse laser and the material is different from nanosecond, the continuous laser is different. The main mechanism of nanosecond laser and continuous laser is thermal effect, so that the detector is disabled. The main action mechanism of the femtosecond laser is a light effect, and the action time of the femtosecond laser on a chip is short due to extremely narrow pulse width, so that the damage area is small, and the requirement of large-area damage is difficult to reach. The picosecond laser pulse width is between nanosecond pulse laser and femtosecond pulse laser, so that the failure time can be shortened on one hand, the infrared detector can be interfered in a large area on the other hand, and the interference effect is more obvious.
The invention adopts the all-fiber picosecond laser, so that the laser has compact structure and improves the running stability and reliability of the laser. The technical route of the invention can cause obvious interference of the infrared detector, and obvious laser irradiation saturation effect and laser temporary blinding effect can be seen from an imaging system. The laser irradiation saturation is that the photoelectric signal saturation is caused by the irradiation of high-energy laser to the infrared detector, but the temporary laser blinding effect of the chip is not damaged. If the laser power is further increased, the effect of permanent distortion of the infrared imaging system can be caused.
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings:
As shown in fig. 1, an interference system based on a multi-spectrum mid-wave infrared picosecond all-fiber laser includes the following parts: the system comprises a multispectral mid-wave infrared picosecond all-fiber laser 10, a light guide device group 20, an infrared imaging system 30 and a power supply control system 40. The multi-spectrum mid-wave infrared picosecond all-fiber laser 10 comprises a multi-spectrum mid-wave infrared picosecond all-fiber amplifier 11, a fixed clamp 12, an end cap 13 with an optical fiber tail fiber, a collimating lens 14, a pitching adjusting device 15 and an azimuth adjusting device 16; the light guide device group 20 comprises a first spectroscope 21, a first focusing lens 22, a first beam combining lens 23, a second spectroscope 24, a second focusing lens 25, a second beam combining lens 26, a reflecting lens 27, a focusing lens 28 and a beam splitting lens 29; infrared imaging system 30 includes an infrared detector 31, an imaging system 32; the power supply control system 40 includes a control system 41 and a power supply system 42. The multispectral mid-wave infrared picosecond all-fiber laser 10 is used for realizing mid-wave infrared collimation laser beams and interfering an infrared detector; the multispectral mid-wave infrared picosecond all-fiber amplifier 11 is used for generating mid-wave infrared picosecond pulse laser; a fixing holder 12 for fixing an end cap 13 with a fiber pigtail; the end cap 13 with the optical fiber tail fiber is used for increasing the output light spot of the optical fiber amplifier and reducing the laser power density of the end face of the optical fiber; a collimator lens 14 for collimating the mid-wave infrared laser beam and compressing the divergence angle; pitch adjustment means 15 for controlling and adjusting the pitch rotation of the fiber end caps; azimuth adjustment means 16 for adjusting the azimuth rotation of the fiber end cap; the light guide device group 20 is used for laser splitting and multi-path laser fusion and changing the laser spot size; a first beam splitter 21 for splitting the laser beam into a 3-3.7 μm band and a 3.7-5 μm band; a first focusing mirror 22 for adjusting the laser spot size of the 3-3.7 μm band; a first beam combiner 23 for transmitting laser light in a 3-3.7 μm wavelength band and reflecting laser light in a 3.7-5 μm wavelength band to combine the laser light; a second beam splitter 24 for splitting the laser beam into a 3.7-4.3 μm band and a 4.3-5 μm band; a second focusing mirror 25 for adjusting the laser spot size of the 3.7-4.3 μm band; a second beam combiner 26 for transmitting laser light in a 3.7-4.3 μm wavelength band and partially reflecting and transmitting laser light in a 3.7-5 μm wavelength band, and performing laser beam combining; a reflecting mirror 27 for reflecting the laser light of the wave band of 4.3-5 μm to realize the adjustment of the light path; a focusing mirror 28 for changing the laser spot size in the 4.3-5 μm band; a beam splitter 29 for partially reflecting and transmitting laser light of 3.7-5 μm wavelength band; the infrared imaging system 30 is a photoelectric countermeasure body and receives the incident laser energy to generate irradiation saturation and blinding effects; the infrared detector 31 is used for sensing the light incident from the front-end lens window, generating an electric signal and outputting the electric signal to an integrated circuit for imaging; an imaging system 32 for receiving the electrical signals output by the integrated circuit and imaging on a display; the power supply control system 40 is used for realizing the change of different laser parameters and ensuring the normal operation of the system; a control system 41 for controlling laser parameter changes, irradiation time and system azimuth and elevation adjustments; and the power supply system 42 is used for effectively ensuring the system to work. The multi-spectrum mid-wave infrared picosecond all-fiber laser 10 comprises a multi-spectrum mid-wave infrared picosecond all-fiber amplifier 11, a fixed clamp 12, an end cap 13 with an optical fiber tail fiber, a collimating lens 14, a pitching adjusting device 15 and an azimuth adjusting device 16. The mid-wave infrared picosecond pulse laser generated by the multi-spectrum mid-wave infrared picosecond all-fiber amplifier 11 is connected with the end cap 13 with the fiber tail fiber, so that the power density of the fiber end face is reduced. The end cap 13 with the optical fiber pigtail is fixed by the fixing clamp 12 and is connected with the pitching adjusting device 15 and the azimuth adjusting device 16, so that multidirectional rotation and interference are realized.
Further, the mid-wave infrared picosecond all-fiber amplifier 11 in the multispectral range is an optical fiber amplifier with 1 MHz-50 MHz output repetition frequency range, 1 ps-100 ps output laser pulse width variable, 1.5 μm-5 μm output laser wave band variable and tunable output power.
Further, the collimator lens 14 is a plano-convex lens or a collimator lens group characterized by a focal length in the range of 30 to 900 mm. The collimating lens group realizes the conversion of the size of the light beam through the lens combination of the two focal lengths. The size of the light spot and the power density are changed by changing the focal length, so that different interference effects are achieved.
The light guide device set 20 of the present invention includes a first beam splitter 21, a first focusing lens 22, a first beam combining lens 23, a second beam splitter 24, a second focusing lens 25, a second beam combining lens 26, a reflecting lens 27, a focusing lens 28, and a beam splitting lens 29. The first spectroscope 21, the second spectroscope 24 and the reflecting mirror 27 are used for separating the output multi-spectrum laser to realize the output of the laser with different wave bands; the first focusing mirror 22, the second focusing mirror 25 and the focusing mirror 28 change the laser power density by adjusting the laser spot size so as to realize laser interference effects of different degrees; the first beam combiner 23, the second beam combiner 26 and the beam splitter 29 are used for fusing multiple paths of laser, realizing interference of different laser wave bands, and analyzing influence effects of different laser parameters on laser interference.
Further, the first focusing lens 22, the second focusing lens 25, and the focusing lens 28 may be dynamic focusing lens modules, where the first focusing lens 22 includes a first lens group, a second lens group, and a convex lens, and the second lens group is connected with a linear motor; the first lens group adopts free-form surface lens, concave lens or a plurality of lens combination, the first lens group is with laser shaping to parallel light, realizes the beam expansion and the plastic of outputting laser light to fiber laser, the second lens group is the dynamic lens group, adopts convex lens, free-form surface lens or a plurality of lens combination, linear motor drives the motion of second lens group for realize carrying out the dynamic regulation and control of beam divergence angle to the laser after beam expansion and the plastic, the second lens group with the convex lens cooperation is used for guaranteeing the dynamic change of laser focus position. The second focusing mirror 25 and the focusing mirror 28 are identical to the first focusing mirror 22.
The infrared imaging system 30 of the present invention includes an infrared detector 31, an imaging system 32, which are sequentially disposed along the laser output beam. The infrared detector 31 is configured to respond to the output laser light to convert the laser light signal into a collectable electrical signal, and to present a disturbance map to the imaging system 32.
Further, the infrared detector 31 may be a mercury cadmium telluride detector or an indium antimonide detector, and may be a multi-element detector or a large area array detector.
The power supply control system 40 of the present invention includes a control system 41 and a power supply system 42. The control system 41 written based on the FPGA controls the laser and the light guide device group, sets corresponding irradiation time, adjusts the mirror group and the like through software, feeds back and adjusts laser parameters in real time, and provides technical support for realizing laser interference under different conditions; the power supply system 42 ensures that the overall system operates efficiently.
The specific working process of the system is as follows:
The medium-wave infrared skin second pulse laser generated by the multi-spectrum medium-wave infrared skin second all-fiber amplifier 11 reduces the output laser power density of the end face of the optical fiber through welding the end cap 13 with the optical fiber tail fiber, and effectively improves the long-time operation capability of the laser; for effective fixation and rotation of the optical fiber end cap, the optical fiber end cap is clamped by the fixed clamp holder 12, the fixed clamp holder 12 is provided with a cable wire which is connected with the pitching adjusting device 15 and the azimuth adjusting device 16, so that the laser emergent optical axis is the same as the optical axes of the light guide device group 20 and the infrared detector 31, whether the laser emergent optical axis is at the right central position can be judged by the imaging system 32, the pitching adjusting device 15 and the azimuth adjusting device 16 are adjusted in a feedback manner, the laser emergent optical axis is consistent in direction, and the emergent optical direction can be changed by the direction control module, so that diversified interference is carried out on the target infrared detector 31. The pitch adjusting device 15 and the azimuth adjusting device 16 are respectively provided with a bearing, a motor and an angle measuring element, and the rotation movements in different directions are completed under the control of the control system 41, so that the target interference in any direction under different laser irradiation time is realized.
A first beam splitter 21 for splitting the laser beam into a 3-3.7 μm band and a 3.7-5 μm band, and adjusting the laser spot size of the 3-3.7 μm band by a first focusing mirror 22. A second beam splitter 24 for splitting the 3.7-5 μm band laser beam reflected by the first beam splitter 21 into 3.7-4.3 μm band and 4.3-5 μm band; a second focusing mirror 25 for adjusting the laser spot size of the 3.7-4.3 μm band; a reflecting mirror 27 for reflecting the laser beam of the 4.3-5 μm wave band transmitted by the second beam splitter 24 to realize the adjustment of the optical path, and a focusing mirror 28 for changing the laser spot size of the 4.3-5 μm wave band; the first focusing lens 22 transmits the laser with the wave band of 3-3.7 mu m and the second beam combining lens 26 reflects the laser with the wave band of 3.7-5 mu m through the first beam combining lens 23 to combine the laser beams; the second beam combiner 26 combines the laser beam of the 3.7-4.3 μm wave band transmitted by the focusing lens 28 and the laser beam of the 3.7-5 μm wave band reflected by the beam splitter 29; the beam splitter 29 realizes partial reflection and transmission of laser light in the 3.7-5 μm wavelength band. The beam splitting and multi-path laser beam fusion of the laser beams are realized through the first spectroscope 21, the first focusing lens 22, the first beam combining lens 23, the second beam splitting lens 24, the second focusing lens 25, the second beam combining lens 26, the reflecting lens 27, the focusing lens 28 and the beam splitting lens 29.
The infrared detector interference with different laser properties is realized by adjusting parameters of the lens group through the control system 41, the multi-dimensional laser interference with different laser powers, different light emitting times and different laser directions is realized by utilizing the control system 41, and the operation effect of the infrared detector 31 after being interfered is observed in real time through the corresponding imaging system 32, so that a certain technical support can be provided for photoelectric countermeasure. The device provided by the invention has the functions of light weight and convenience, can be used for diversified emission of laser to interfere a target, effectively reduces the damage threshold value of the medium-wave infrared skin second laser, and can be used for observing the operation effect of the infrared detector after being interfered in real time through the infrared imaging system. Different properties of interference to the infrared imaging system can be realized by carrying out different modulation control on laser.
The above description is only of preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An interference system based on a multispectral mid-wave infrared picosecond all-fiber laser is characterized in that: comprises the following parts: the system comprises a multispectral mid-wave infrared picosecond all-fiber laser (10), a light guide device group (20), an infrared imaging system (30) and a power supply control system (40); the infrared imaging system (30) comprises an infrared detector (31) and an imaging system (32), wherein the infrared detector (31) is used for responding to output laser so as to convert laser signals into collectable electric signals, and an interference effect graph is displayed on the imaging system (32);
The multi-spectrum mid-wave infrared picosecond all-fiber laser (10) comprises a multi-spectrum mid-wave infrared picosecond all-fiber amplifier (11), a fixed clamp holder (12), an end cap (13) with an optical fiber tail fiber, a collimating lens (14), a pitching adjusting device (15) and an azimuth adjusting device (16);
The light guide device group (20) comprises a first spectroscope (21), a first focusing lens (22), a first beam combining lens (23), a second spectroscope (24), a second focusing lens (25), a second beam combining lens (26), a reflecting mirror (27), a focusing lens (28) and a beam splitting lens (29); the infrared imaging system (30) comprises an infrared detector (31) and an imaging system (32); the power supply control system (40) comprises a control system (41) and a power supply system (42);
The multispectral mid-wave infrared picosecond all-fiber laser (10) is used for realizing mid-wave infrared collimation laser beams and interfering an infrared detector; a multispectral mid-wave infrared picosecond all-fiber amplifier (11) for generating mid-wave infrared picosecond pulse laser; a fixing clamp (12) for fixing an end cap (13) of the fiber pigtail; the end cap (13) with the optical fiber tail fiber is used for increasing the output light spot of the optical fiber amplifier and reducing the laser power density of the end face of the optical fiber; a collimating lens (14) for collimating the medium wave infrared laser beam and compressing the divergence angle; a pitching adjusting device (15) for controlling and adjusting pitching rotation of the optical fiber end cap; azimuth adjusting means (16) for adjusting azimuth rotation of the fiber end cap;
The light guide device group (20) specifically comprises: the first spectroscope (21), the second spectroscope (24) and the reflecting mirror (27) are used for separating the output multi-spectrum laser to realize the output of the laser with different wave bands; the first focusing mirror (22), the second focusing mirror (25) and the focusing mirror (28) change the laser power density by adjusting the laser spot size so as to realize the laser interference effects of different degrees; the first beam combiner (23), the second beam combiner (26) and the beam splitter (29) are used for fusing multiple paths of lasers;
The infrared imaging system (30) receives the incident laser energy and generates irradiation saturation and blinding effects; the infrared detector (31) is used for sensing light rays incident on the front-end lens window, generating an electric signal and outputting the electric signal to an integrated circuit for imaging; an imaging system (32) for receiving the electrical signals output by the integrated circuit and imaging on a display; the power supply control system (40) is used for realizing the change of different laser parameters and ensuring the normal operation of the system; a control system (41) for controlling laser parameter changes, irradiation time and system azimuth and elevation adjustments; the power supply system (42) is used for effectively ensuring the system to work; the medium-wave infrared skin second pulse laser generated by the multi-spectrum medium-wave infrared skin second all-fiber amplifier (11) is connected with the end cap (13) with the fiber tail fiber, so that the power density of the fiber end face is reduced; the end cap (13) with the optical fiber tail fiber is fixed by the fixing clamp holder (12) and is connected with the pitching adjusting device (15) and the azimuth adjusting device (16) so as to realize multidirectional rotation and interference.
2. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the first spectroscope (21) is used for dividing the laser beam into a 3-3.7 mu m wave band and a 3.7-5 mu m wave band; the first focusing mirror (22) is used for adjusting the laser spot size of a 3-3.7 mu m wave band; the first beam combining lens (23) is used for transmitting laser of a wave band of 3-3.7 mu m and reflecting laser of a wave band of 3.7-5 mu m to perform laser beam combining; a second beam splitter (24) for splitting the laser beam into a 3.7-4.3 [ mu ] m band and a 4.3-5 [ mu ] m band; the second focusing mirror (25) is used for adjusting the laser spot size of a 3.7-4.3 mu m wave band; the second beam combining lens (26) is used for transmitting laser light of a 3.7-4.3 mu m wave band and partially reflecting and transmitting the laser light of the 3.7-5 mu m wave band to perform laser beam combining; the reflecting mirror (27) is used for reflecting laser of 4.3-5 mu m wave bands and realizing light path adjustment; a focusing mirror (28) for changing the laser spot size of the 4.3-5 mu m wave band; the beam splitter (29) is used for partially reflecting and transmitting laser with a wave band of 3.7-5 mu m; the partial reflection is 20% -60% reflection.
3. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the multispectral mid-wave infrared picosecond all-fiber amplifier (11) is an optical fiber amplifier with the output repetition frequency range of 1 MHz-50 MHz, the output laser pulse width of 1 ps-100 ps, the output laser wave band of 1.5 mu m-5 mu m and the tunable output power.
4. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the collimating lens (14) is a plano-convex lens or a collimating lens group with a focal length range of 30-900 mm; the collimating lens group realizes the conversion of the size of the light beam through the lens combination of the two focal lengths; the size of the light spot and the power density are changed by changing the focal length, so that different interference effects are achieved.
5. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the first focusing lens (22), the second focusing lens (25) and the focusing lens (28) are dynamic focusing lens modules, wherein the first focusing lens (22) comprises a first lens group, a second lens group and a convex lens, and the second lens group is connected with a linear motor; the first lens group adopts a free-form surface lens, a concave lens or a plurality of lens combinations, the first lens group shapes laser into parallel light to realize beam expansion and shaping of laser output by the fiber laser, the second lens group adopts a dynamic lens group, adopts a convex lens, a free-form surface lens or a plurality of lens combinations, the linear motor drives the second lens group to move and is used for realizing dynamic regulation and control of a beam divergence angle of the laser after beam expansion and shaping, and the second lens group is matched with the convex lens and is used for ensuring dynamic change of a laser focus position; the second focusing mirror (25) and the focusing mirror 28 are identical to the first focusing mirror (22).
6. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the infrared detector (31) is a tellurium-cadmium-mercury detector, or an indium antimonide detector, or a multi-element detector or a large area array detector.
7. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the power supply control system (40) comprises a control system (41) and a power supply system (42); a control system (41) written based on the FPGA controls the laser and the light guide device group, corresponding irradiation time is set through software, the lens group is adjusted, laser parameters are fed back and adjusted in real time, and technical support is provided for realizing laser interference under different conditions.
8. The interference system based on the multi-band mid-wave infrared picosecond all-fiber laser of claim 1, wherein: the specific working process is as follows:
the medium-wave infrared skin second pulse laser generated by the multi-spectrum medium-wave infrared skin second all-fiber amplifier (11) reduces the output laser power density of the end face of the optical fiber through welding the end cap (13) with the optical fiber tail fiber, and effectively improves the long-time operation capability of the laser; in order to effectively fix and rotate the optical fiber end cap, the optical fiber end cap is clamped by utilizing a fixed clamp holder (12), a cable wire arranged on the fixed clamp holder (12) is connected with a pitching adjusting device (15) and an azimuth adjusting device (16), so that the laser emergent optical axis is the same as the optical axes of a light guide device group (20) and an infrared detector (31), whether the optical axes are in the right central position is judged by an imaging system (32), the pitching adjusting device (15) and the azimuth adjusting device (16) are fed back and adjusted, the directions of the optical axes are consistent with the directions of the laser emergent optical axes, and the emergent optical directions can be changed by an orientation control module to carry out diversified interference on the target infrared detector (31); the pitching adjusting device (15) and the azimuth adjusting device (16) are respectively provided with a bearing, a motor and an angle measuring element, and the revolving motions in different directions are completed under the control of the control system (41), so that the target interference in any direction under different laser irradiation time is realized.
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