Laser unlocking device based on Bessel beam

Abstract

The invention belongs to the technical field of fire rescue equipment, and particularly provides a Bessel beam-based laser unlocking device which comprises an HF chemical laser generation module, a Bessel optical shaping module, a lock cylinder calibration and coaxial purging module and a lightweight bearing frame. An HF chemical laser generating module generates an HF chemical laser of 2.7-3.0 [mu] m, and a wavelength conversion lens group is adapted to a Bessel optical shaping module to generate a long-focal-depth Bessel diffraction-free filament with the diameter of 2mm and the length of more than or equal to 40mm, and the long-focal-depth Bessel diffraction-free filament can penetrate through a complex lock cylinder at a time. The lock cylinder calibration and coaxial purging module accurately positions a lock cylinder structure through a CMOS visual sensor and dynamically adjusts coaxial nitrogen to purge slag, so that the cutting precision and cleanliness are ensured. The light-weight bearing frame is integrated with a micro-channel liquid cooling pipeline, optical elements are directly cooled, and stable operation of equipment is guaranteed. The quick lock breaking device realizes quick lock breaking and has the advantages of no spark, low vibration and light weight.

Description

Technical Field

[0001] This invention belongs to the field of fire rescue equipment technology, specifically referring to a laser unlocking device based on Bessel beams. Background Technology

[0002] In fire rescue operations, the efficiency of lock breaking is directly related to the safety of trapped personnel, but traditional lock breaking methods have many fatal shortcomings. Hydraulic shears, electric drills, and other mechanical tools cause violent vibrations during operation, easily deforming the lock body, exacerbating rescue difficulties, and potentially causing secondary injuries to the trapped person; breaking a single lock typically takes 3-8 minutes, far from meeting the needs of emergency scenarios; sparks generated by mechanical friction can easily cause explosions or spread of fire in flammable and explosive environments such as gas leaks or chemical industrial parks; these tools are large and heavy, making them extremely difficult to maneuver in confined spaces or at heights.

[0003] Existing laser unlocking devices mostly use Gaussian beams with a focal depth of only 0.1-0.2mm, while the mainstream mechanical lock cylinder has a depth of 15-40mm and contains complex structures such as multi-stage pins and blade grooves. The Gaussian beam cannot penetrate it in one go and requires segmented operation, which still has the problems of long time consumption and easy melting and jamming of the lock cylinder.

[0004] The long focal depth of Bessel beams is an ideal solution, but it is limited by existing technology. First, it is incompatible with the wavelength of high-power laser systems and lacks an effective adaptation solution. Second, it lacks a precise positioning system for individual differences in lock cylinders and has no special thermal management design, which can easily lead to lens deformation and beam characteristic failure.

[0005] There is a lack of laser lock picks in the current technology that can meet the needs of fire rescue for rapid, spark-free, and low-vibration lock breaking. Summary of the Invention

[0006] This invention overcomes the shortcomings of existing technologies and provides a laser lock pick based on a Bessel beam. By integrating an HF chemical laser generation module, it optically shapes a Bessel non-diffraction filament with a focal depth of ≥40mm, achieving precise ablation and cutting of lock cylinder pins or blades, meeting the needs of rapid, spark-free, and low-vibration lock breaking in fire rescue operations. It effectively solves the problems existing in the prior art.

[0007] The technical solution adopted in this invention is as follows: This solution provides a laser lock pick based on a Bessel beam, including an HF chemical laser generating module, a Bessel optical shaping module, a lock cylinder calibration and coaxial purging module, and a lightweight load-bearing frame. Each module is linked with an electronic control system through a precision mechanical interface. The HF chemical laser generating module includes a liquid fluorine storage tank, a liquid hydrogen storage tank, a solenoid valve, a combustion chamber, a supersonic cavity mirror, and a CaF2 light output window. The Bessel optical shaping module includes a wavelength conversion lens group and a Bessel shaping lens group. The lock cylinder calibration and coaxial purging module includes a lock cylinder calibrator and a coaxial gas nozzle. The lightweight load-bearing frame includes a magnesium-lithium alloy skeleton and a carbon fiber shell. The HF chemical laser generating module serves as an energy source, outputting stable fundamental frequency light to the Bessel optical shaping module after passing through the wavelength conversion lens group. The Bessel optical shaping module converts the fundamental frequency light into a long-depth-of-focus Bessel non-diffraction filament. The lock cylinder calibration and coaxial purge module captures the structural features of the lock cylinder in real time and dynamically adjusts the operating parameters. The lightweight load-bearing frame provides structural support and thermal management for the entire machine. The HF chemical laser generating module is connected to the Bessel optical shaping module via a QBH interface. The lock cylinder calibration and coaxial purge module is integrated at the end of the Bessel optical shaping module. All three are installed within the lightweight load-bearing frame, realizing fully automated operation of "laser generation - wavelength adaptation - beam shaping - precise positioning - safe cutting".

[0008] The HF chemical laser generating module serves as an energy source, generating and stably outputting a high-power HF chemical laser through a chemical combustion reaction. It includes a fuel unit, a laser generation unit, and a beam output unit. The fuel unit provides the reaction raw materials for HF chemical laser generation and includes two fuel storage devices: a liquid fluorine storage tank and a liquid hydrogen storage tank, both connected to the combustion chamber via solenoid valves. These solenoid valves control the on / off state and flow rate of the fuel and are powered by a lithium thionyl chloride battery (14V 0.5Ah). The laser generation unit is the core subunit for converting chemical energy into laser energy, with the combustion chamber as its core component. The combustion chamber is a sealed cavity that performs the fuel combustion reaction and generates the laser, made of C / C composite material. Inside the combustion chamber, liquid hydrogen and liquid fluorine undergo a combustion reaction to generate an HF chemical laser with a wavelength of 2.7-3.0μm, meeting the requirements for rapid ablation of thick-walled lock cores. The beam output unit is the subunit that exports and initially shapes the generated HF chemical laser, including a supersonic cavity mirror and a CaF2 light-emitting window. The supersonic cavity mirror is a reflector assembly used to form a population inversion laser resonant cavity and accelerate gas flow. The CaF2 light-emitting window is a window component used to output the HF chemical laser, and is made of calcium fluoride (CaF2) material. The HF chemical laser emitted by the HF chemical laser generation module at a wavelength of 2.7-3.0 μm is compatible with the 1030-1064 nm design wavelength of the Bessel shaping lens group in the Bessel optical shaping module through the wavelength conversion lens group, breaking through the power limitations of traditional fiber lasers.

[0009] The core of the Bessel optical shaping module consists of two subsystems: wavelength conversion and beam shaping, including a wavelength conversion lens group and a Bessel shaping lens group. The wavelength conversion lens group uses a combination of ZnSe crystal and Ge lens to efficiently convert the 2.8μm HF chemical laser into the 1064nm fundamental frequency light, with a conversion efficiency ≥95%, solving the wavelength compatibility problem between the HF chemical laser and the Bessel shaping lens group. The Bessel shaping lens group consists of an Al-Be concave conical mirror (170° cone angle), a fused silica convex conical mirror (95° cone angle), and a beam-shrinking lens group. Parameter control is achieved through a precision adjustment frame (adjustment accuracy 1μm), ultimately outputting a long-depth-of-focus Bessel diffraction-free filament with a diameter of 2mm and a length ≥40mm, achieving an energy density of 5×10⁻⁶. 5 W / cm 2 It can penetrate multiple levels of pin tumbler lock cylinders in one go (maximum depth 40mm).

[0010] The lock cylinder calibration and coaxial purging module is used to identify the lock cylinder structure and remove slag generated during cutting. It includes a lock cylinder calibrator and a coaxial gas nozzle. This module is integrated into the end of the Bessel reshaping lens assembly, forming an integrated "shaping-positioning-purging" structure. The lock cylinder calibrator identifies the internal structure of the lock cylinder and locates the target. It incorporates a CMOS vision sensor, a 650nm red light indicator, and a control system. The CMOS vision sensor acquires image information of the lock cylinder through an image recognition algorithm; the 650nm red light indicator indicates the aiming direction of the long-focal-depth Bessel non-diffraction filament. The lock cylinder calibrator identifies the position of the lock cylinder pins using an image recognition algorithm with an accuracy of ±0.1mm and feeds back three-dimensional coordinates to the control system. The coaxial gas nozzle removes cutting slag and features a ring design. Nitrogen gas is introduced during operation, and the nitrogen flow rate (0.5-0.8MPa) is dynamically adjusted according to the lock cylinder material (copper / iron alloy), outputting coaxially with the long-focal-depth Bessel non-diffraction filament. The lock cylinder calibrator feeds back the identified lock cylinder coordinates to the control system. The control system dynamically adjusts the gas flow rate of the coaxial gas nozzle according to the lock cylinder type to suppress slag from adhering to the inside of the lock cylinder and prevent the lock cylinder from getting stuck.

[0011] The lightweight load-bearing frame adopts a composite structure of magnesium-lithium alloy skeleton and carbon fiber shell. The magnesium-lithium alloy skeleton integrates high-precision guide rails and quick-release grips, reducing weight by 40% compared to traditional aluminum alloy frames. The carbon fiber shell embeds microchannel liquid cooling pipelines, which use water-ethylene glycol coolant to flow directly through the Bessel orthokeratology lens assembly, achieving a heat flux density of 300 W / cm². 2 The efficient heat dissipation ensures that the temperature of the Bessel orthokeratology lens assembly is ≤50℃ within 30 minutes of continuous operation, avoiding beam quality degradation caused by thermal deformation.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) Through the design of the Bessel optical shaping module, the wavelength conversion lens group first accurately converts the 2.7-3.0μm wavelength of the HF chemical laser into a wavelength of 1030-1064nm adapted to the Bessel shaping lens group, with a conversion efficiency ≥95%; then, the Bessel shaping lens group generates a long-depth-of-focus Bessel non-diffraction filament with a diameter of 2mm and a length ≥40mm. The focal depth of the long-depth-of-focus Bessel non-diffraction filament is 200 times higher than that of the traditional Gaussian beam (0.1-0.2mm), which can penetrate complex lock cores (including multi-stage tumblers and blade groove structures) with a depth of 15-40mm in one go without the need for segmented focal length adjustment. The HF chemical laser generating module outputs a 3kW high-power HF chemical laser with an energy density of 2×10 8 W / cm 2It can quickly ablate the lock cylinder pins or blades, ultimately reducing the single lock breaking time to 10-15 seconds, which is 6-8 times faster than traditional laser equipment (1-2 minutes) and 20-30 times faster than mechanical tools such as hydraulic shears and electric drills (3-8 minutes), thus improving the lock breaking efficiency.

[0014] (2) The HF chemical laser generating module is used as the energy source. The HF chemical laser is generated by the chemical reaction of liquid hydrogen and liquid fluorine in the combustion chamber. There is no external power input throughout the process, which completely avoids the risk of electric sparks caused by the operation of traditional electric drills and electric laser equipment. The whole machine is based on the shock absorption design of the lightweight load-bearing frame. The composite structure of the magnesium-lithium alloy skeleton and the carbon fiber shell can buffer the slight recoil during laser emission. Combined with the non-mechanical contact cutting method, the working amplitude is controlled to ≤0.1mm, which greatly reduces vibration damage. The non-spark cutting characteristic combined with coaxial nitrogen purging further eliminates the risk of ignition in the working area. It is perfectly adapted to flammable and explosive rescue scenarios such as gas leaks and chemical industrial parks, and enhances the safety of operation.

[0015] (3) The lock cylinder calibration and coaxial purging module form a dynamic collaborative closed loop. The lock cylinder calibrator has a built-in CMOS vision sensor, a 650nm red light indicator, and a control system. The CMOS vision sensor captures the position of the lock cylinder pins and blades in real time through image recognition algorithms, with a positioning accuracy of ±0.1mm, ensuring that the long focal depth Bessel non-diffraction filament accurately aims at the cutting target point. The control system dynamically adjusts the nitrogen flow rate (0.5-0.8MPa) of the coaxial gas nozzle according to the cutting progress, forming a directional gas curtain in the ablation area, blowing away the molten slag in time, and avoiding cutting deviation caused by molten slag adhesion. The non-diffraction characteristic of the long focal depth Bessel non-diffraction filament results in a cutting taper of <0.2°. Combined with the high-precision processing technology of the concave conical mirror, the chipping of the pin groove is controlled within ≤5μm, effectively preventing excessive melting and deformation of the lock cylinder, completely avoiding secondary jamming problems, and improving cutting accuracy.

[0016] (4) The lightweight load-bearing frame uses magnesium-lithium alloy as the core material of the skeleton, combined with the high-strength carbon fiber shell, to minimize weight while ensuring structural strength, so that the weight of the whole machine is ≤2.5kg and the length is controlled to <400mm, which conforms to ergonomic design and supports one-handed operation by rescuers. The lightweight load-bearing frame is embedded with microchannel liquid cooling pipeline. The coolant in the microchannel liquid cooling pipeline flows directly through the Bessel orthokeratology lens group, which efficiently removes the heat generated by high-power laser operation and keeps the lens temperature stable within a safe range. The microchannel liquid cooling pipeline combined with the wide temperature adaptability design ensures that the equipment can work stably in extreme environments from -20℃ to 50℃, and can easily cope with the use needs of complex rescue scenarios such as narrow spaces, high altitudes, low temperatures or high temperatures, thus enhancing its practical adaptability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a laser unlocking device based on a Bessel beam.

[0018] Figure 2 This is a schematic diagram of an HF chemical laser generator module;

[0019] Figure 3 A schematic diagram illustrating the collaboration between the Bessel optical shaping module and the lock cylinder calibration module;

[0020] Figure 4 This is a schematic diagram of a lightweight load-bearing frame and thermal management system.

[0021] The components include: 1. Liquid fluorine storage tank; 2. Liquid hydrogen storage tank; 3. Solenoid valve; 4. Combustion chamber; 5. Supersonic cavity mirror; 6. CaF2 light output window; 7. Wavelength conversion lens group; 8. Bessel shaping mirror group; 9. Lock cylinder calibrator; 10. Coaxial gas nozzle; 11. Magnesium-lithium alloy skeleton; 12. Carbon fiber shell; 13. Microchannel liquid cooling pipeline; 14. Concave cone mirror; 15. Convex cone mirror; 16. Beam shrinking mirror group; 17. CMOS vision sensor; 18. 650nm red light indicator; 19. Control system; 101. HF chemical laser generation module; 102. Bessel optical shaping module; 103. Lock cylinder calibration and coaxial purging module; 104. Lightweight load-bearing frame.

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Example: Please refer to Figures 1-4This embodiment of a laser lock pick based on a Bessel beam includes an HF chemical laser generating module 101, a Bessel optical shaping module 102, a lock cylinder calibration and coaxial purging module 103, and a lightweight load-bearing frame 104. The HF chemical laser generating module 101 serves as the energy source of the device, responsible for generating HF chemical laser of a specific wavelength, which, after wavelength conversion processing, outputs stable fundamental frequency light to the Bessel optical shaping module 102. The Bessel optical shaping module 102 serves as the beam modulation core, converting the incident fundamental frequency light into a long-depth-of-focus Bessel non-diffraction filament. The lock cylinder calibration and coaxial purging module 103 serves as a positioning and auxiliary cutting unit, capturing the structural features of the lock cylinder in real time and dynamically adjusting the operating parameters. The lightweight load-bearing frame 104 serves as the support and protection structure of the device, providing mechanical support and thermal management functions for the entire machine. The HF chemical laser generating module 101 is connected to the Bessel optical shaping module 102 via a QBH interface, with coaxiality error controlled within 0.05mm. The Bessel optical shaping module 102 integrates the lock core calibration and coaxial purging module 103 at its end. All three are installed in the lightweight load-bearing frame 104, realizing fully automated operation of "laser generation - wavelength adaptation - beam shaping - precise positioning - safe cutting".

[0025] The HF chemical laser generating module 101 serves as an energy source, generating a high-power HF chemical laser through a chemical combustion reaction and outputting it stably. It includes a fuel unit, a laser generating unit, and a beam output unit.

[0026] The fuel unit provides reaction raw materials for HF chemical laser generation and includes two fuel storage devices: a liquid fluorine storage tank 1 and a liquid hydrogen storage tank 2. Liquid fluorine storage tank 1 stores liquid fluorine fuel, and liquid hydrogen storage tank 2 stores liquid hydrogen fuel. Both are connected to the combustion chamber 4 via a solenoid valve 3. The solenoid valve 3 is an electrically driven valve device used to control the on / off state and flow rate of the fuel. The solenoid valve 3 is powered by a lithium thionyl chloride battery (14V 0.5Ah).

[0027] The laser generation unit is the core subunit for converting chemical energy into laser energy, and its core component is the combustion chamber 4. The combustion chamber 4 is a sealed cavity that performs the fuel combustion reaction and generates laser energy. It is made of C / C composite material, with a wall thickness of 3 mm and an internal working pressure maintained at 5 MPa. Inside the combustion chamber 4, liquid hydrogen and liquid fluorine undergo a combustion reaction to generate an HF chemical laser with a wavelength of 2.8 μm, a single pulse energy of 2.1 kJ, and an output power of 3 kW, meeting the requirements for rapid ablation of thick-walled lock cylinders.

[0028] The beam output unit is a subunit that exports and initially shapes the generated HF chemical laser, comprising a supersonic cavity mirror 5 and a CaF2 output window 6. The supersonic cavity mirror 5 is a mirror assembly used to form a population inversion laser resonant cavity and accelerate gas flow; it employs a copper-tungsten water-cooled mirror assembly (Φ30mm). The CaF2 output window 6 is a window component for outputting the HF chemical laser, made of calcium fluoride (CaF2) material, with a size of Φ25mm, transmitting a 3kW HF chemical laser with a single output energy of 2.1kJ / shot. To ensure the stability of HF chemical laser transmission, the outlet flange of the combustion chamber 4 is fixed to the supersonic cavity mirror 5 with a high-temperature resistant sealing ring; the CaF2 output window 6 is embedded at the end of the supersonic cavity mirror 5. The coaxiality error of the combustion chamber 4, the supersonic cavity mirror 5, and the CaF2 output window 6 is within 0.05mm, ensuring that the HF chemical laser will not suffer energy loss due to misalignment during transmission.

[0029] The Bessel optical shaping module 102 converts the HF chemical laser output from the HF chemical laser generator module 101 into a long-depth-of-focus Bessel non-diffraction filament that meets the requirements for unlocking. The core of the Bessel optical shaping module 102 consists of a two-stage subsystem of wavelength conversion and beam shaping, including a wavelength conversion lens group 7 and a Bessel shaping lens group 8. The wavelength conversion lens group 7 is fixed behind the CaF2 window 6 via a threaded interface, and the Bessel shaping lens group 8 is connected to the wavelength conversion lens group 7 via a precision adjustment bracket.

[0030] The wavelength conversion lens group 7 is composed of ZnSe crystal and Ge lens. The two work together to convert HF chemical laser with a wavelength of 2.8μm into fundamental frequency light with a wavelength of 1064nm through nonlinear optical effects, with a conversion efficiency of 95%. This solves the wavelength compatibility problem between the HF chemical laser and the Bessel shaping lens group 7, and breaks through the power limitation of traditional fiber lasers.

[0031] The input beam of the Bessel shaping lens group 8 is a Φ3mm single-mode Gaussian beam, and the main lobe of the output long-focus Bessel diffraction-free filament is 4μm FWHM, the diffraction-free distance is 45mm (customizable), and the working distance is 15mm (adjustable). The Bessel shaping lens group 8 is the core component for converting the single-mode Gaussian beam into a long-focus Bessel diffraction-free filament. It consists of a concave conical mirror 14 (170° cone angle) made of Al-Be material, a convex conical mirror 15 (95° cone angle) made of fused silica material, and a beam-shrinking lens group 16. A precision adjustment frame (adjustment accuracy 1μm) ensures the alignment of the axes of each optical component, enabling parameter control of the long-focus Bessel diffraction-free filament. The final output is a long-focus Bessel diffraction-free filament with a diameter of 2mm and a length of 40mm, achieving an energy density of 5×10⁻⁶. 5 W / cm 2It can penetrate multiple levels of pin tumbler lock cylinders in one go (maximum depth 40mm), meeting the ablation requirements of deep lock cylinders.

[0032] The lock cylinder calibration and coaxial purging module 103 is used to identify the lock cylinder structure and remove the slag generated during cutting. It includes a lock cylinder calibrator 9 and a coaxial gas nozzle 10. The lock cylinder calibration and coaxial purging module 103 is integrated at the end of the Bessel orthokeratology lens group 8, forming an integrated structure of "orthokeratology-positioning-purging".

[0033] The lock cylinder calibrator 9 is used to identify the internal structure of the lock cylinder and locate the target. It has a built-in CMOS vision sensor 17, a 650nm red light indicator 18, and a control system 19. The CMOS vision sensor 17 acquires image information of the lock cylinder through an image recognition algorithm. The 650nm red light indicator 18 is a positioning device that emits red laser light to indicate the aiming direction of the long focal depth Bezier non-diffraction filament. The lock cylinder calibrator 9 identifies the position of the lock cylinder pins through an image recognition algorithm with an accuracy of ±0.1mm and feeds back the three-dimensional coordinates to the control system 19.

[0034] The coaxial gas nozzle 10 is used to remove cutting slag. It adopts a ring design with an inner diameter of 3mm. Nitrogen gas is introduced during operation. The nitrogen gas flow rate (0.5-0.8MPa) is dynamically adjusted according to the lock core material (copper / iron alloy). The normal working pressure is 0.5MPa. It outputs coaxially with the long focal depth Bessel non-diffraction filament.

[0035] The lock cylinder calibrator 9 feeds back the identified lock cylinder coordinates to the control system 19. The control system 19 dynamically adjusts the gas flow rate of the coaxial gas nozzle 10 according to the lock cylinder type. When cutting the V-shaped opening of the blade lock, the nitrogen pressure is increased to 0.8 MPa to enhance the airflow intensity and form an air curtain in the laser cutting area to suppress molten slag from adhering to the inside of the lock cylinder and prevent the lock cylinder from getting stuck inside.

[0036] The lightweight load-bearing frame 104 adopts a composite structure of magnesium-lithium alloy skeleton 11 and carbon fiber shell 12. It serves as the structural support and thermal management carrier for the equipment, fixing each module and maintaining the stable operating temperature of the equipment.

[0037] The magnesium-lithium alloy frame 11 is the main load-bearing structure of the frame. The magnesium-lithium alloy frame 11 integrates high-precision guide rails and quick-release grips, reducing weight by 40% compared to traditional aluminum alloy frames, making the equipment easier to carry and operate. A trigger button is installed on the magnesium-lithium alloy frame 11 to start the system.

[0038] The carbon fiber shell 12 is a protective structure that encloses the magnesium-lithium alloy skeleton 11. The carbon fiber shell 12 contains embedded microchannel liquid cooling pipes 13, which use water-glycol coolant. The coolant flowing inside the carbon fiber shell 12 flows directly through the Bessel orthokeratology lens assembly 8, removing the heat generated by the Bessel orthokeratology lens assembly 8 during operation through heat exchange, achieving a heat flux density of 300 W / cm². 2 The efficient heat dissipation ensures that the lens body temperature remains below 50°C within 30 minutes of continuous operation, thus avoiding the degradation of the long focal depth Bessel non-diffraction filament quality caused by thermal deformation.

[0039] The magnesium-lithium alloy skeleton 11 is fixed to the carbon fiber shell 12 with bolts to ensure the stability of the overall structure; the inlet and outlet of the microchannel liquid cooling pipeline 13 are connected to an external circulation pump (a device that drives the circulation of coolant) through quick-connect couplings to form a complete cooling circulation system and ensure the temperature stability of the equipment during long-term operation.

[0040] The specific implementation method of this embodiment is as follows: The operator starts the system by triggering the button on the magnesium-lithium alloy skeleton 11 in the lightweight load-bearing frame 104. The 14V lithium thionyl chloride battery supplies power to the solenoid valve 3. The valve core of the solenoid valve 3 completes the opening action within 0.2 seconds, simultaneously opening the output channels of the liquid hydrogen storage tank 2 and the liquid fluorine storage tank 1. Liquid hydrogen (flow rate 5mL / s) and liquid fluorine (flow rate 3mL / s) enter the C / C composite combustion chamber 4 at a molar ratio of 1.67:1. An exothermic reaction occurs under a working pressure of 5MPa, and the temperature of the reaction zone instantly rises to 2800K, exciting HF molecules to transition and generate 2.7-3.0μm band laser to form HF chemical laser. A stable resonant cavity is formed by the copper-tungsten water-cooled mirror group of the supersonic cavity mirror 5, and the HF chemical laser power is stably output (3kW) within 30ms. The HF chemical laser is led out through the CaF2 light-emitting window 6 (transmittance ≥98%) to ensure that the initial beam divergence angle is ≤1mrad, providing a stable fundamental frequency light for subsequent shaping. The exported 2.8μm HF chemical laser enters wavelength conversion lens group 7, which consists of a ZnSe crystal (5mm thick) and a Ge lens (20mm focal length). Through nonlinear optical effects, the wavelength of the HF chemical laser is compressed, efficiently converting the 2.8μm HF chemical laser into a 1.06μm (1064nm) fundamental frequency light with a conversion efficiency of 96%, thus solving the wavelength matching problem with the Bessel shaping lens group. The 1064nm fundamental frequency light enters Bessel shaping lens group 8, and sequentially passes through an Al-Be concave conical mirror 14 (cone angle 170°, reflectivity ≥99.5%), a fused silica convex conical mirror 15 (cone angle 95°, refractive index 1.46), and a beam-shrinking lens group 16 (beam-shrinking ratio 2:1). This synergistic effect forms a Φ2mm, 40mm long-focal-depth Bessel diffraction-free filament with a Bessel function characteristic of strong energy distribution at the center and weak energy distribution at the edges, ensuring a stable energy density of 5×10⁻⁶ within a 40mm depth. 5 W / cm 2The CMOS vision sensor 17 of the lock cylinder calibrator 9 acquires real-time images of the lock cylinder and identifies the position of the pins using an image recognition algorithm, with a positioning error within 0.1mm. Simultaneously, a 650nm red light indicator 18 emits an aiming beam, with the coaxiality error between the beam and the long-focus Bessel non-diffraction filament controlled within 0.05mm, guiding the long-focus Bessel non-diffraction filament to precisely align with the central axis of the lock cylinder. The lock cylinder calibrator 9 feeds back the pin coordinates (X and Y axis deviations) to the control system 19, which uses a micro-stepping motor (adjustment accuracy 1μm) built into the lightweight load-bearing frame 104 to fine-tune the angle of the Bessel shaping lens group 8, ensuring that the alignment deviation between the long-focus Bessel non-diffraction filament and the pin center is within 0.03mm. The long-focus, deep-focus Bessel non-diffraction filament is triggered to emit a single pulse of 1.5ms. This filament ablates a 2mm diameter, 40mm deep through-hole along the lock cylinder axis in a single pass. For 2mm copper pins, the ablation depth is controlled at 1.9mm (leaving a 0.1mm connection), thus disrupting the pin's locking function while preventing complete pin detachment and potential jamming within the lock cylinder. During ablation, the beam energy of the long-focus, deep-focus Bessel non-diffraction filament is concentrated at the center of the pin, keeping the heat-affected zone within 0.3mm to prevent deformation of the lock cylinder shell. Simultaneously, the coaxial gas nozzle 10 is activated, dynamically adjusting the nitrogen flow rate according to the ablation progress. An initial 0.8MPa high-pressure airflow quickly removes surface slag, then reduces to 0.5MPa after 1ms to maintain a stable gas curtain, keeping slag splash distance within 3mm to ensure the lock cylinder's internal cleanliness. The entire process from opening the solenoid valve 3 to unlocking the lock cylinder takes less than 3 seconds (of which the long focal depth Bessel non-diffraction filament emission time is 1.5ms and the system response and positioning time is 2.8 seconds), which is significantly shorter than the traditional method.

[0041] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A laser unlocking device based on a Bessel beam, characterized in that, The system includes an HF chemical laser generating module (101), a Bessel optical shaping module (102), a lock core calibration and coaxial purging module (103), and a lightweight load-bearing frame (104). The HF chemical laser generating module (101) is used to generate HF chemical lasers. The Bessel optical shaping module (102) is used to convert the HF chemical lasers into long focal depth Bessel diffraction-free filaments. The lock cylinder calibration and coaxial purging module (103) is used to capture the structural features of the lock cylinder in real time and dynamically adjust the operating parameters; the lightweight load-bearing frame (104) provides structural support and thermal management for the whole machine; the HF chemical laser generating module (101) is connected to the Bessel optical shaping module (102) through the QBH interface, and the lock cylinder calibration and coaxial purging module (103) is integrated at the end of the Bessel optical shaping module (102), and the three are installed together in the lightweight load-bearing frame (104).

2. The laser unlocking device based on a Bessel beam according to claim 1, characterized in that: The HF chemical laser generating module (101) includes a liquid fluorine storage tank (1), a liquid hydrogen storage tank (2), a solenoid valve (3), a combustion chamber (4), a supersonic cavity mirror (5), and a CaF2 light-emitting window (6); the liquid fluorine storage tank (1) and the liquid hydrogen storage tank (2) are connected to the combustion chamber (4) through the solenoid valve (3); the outlet of the combustion chamber (4) is connected to the supersonic cavity mirror (5), and the CaF2 light-emitting window (6) is located at the end of the supersonic cavity mirror (5).

3. A laser unlocking device based on a Bessel beam according to claim 2, characterized in that: The combustion chamber (4) is made of C / C composite material.

4. A laser unlocking device based on a Bessel beam according to claim 1, characterized in that: The Bessel optical shaping module (102) includes a wavelength conversion lens group (7) and a Bessel shaping lens group (8); the wavelength conversion lens group (7) is used to convert the wavelength of the HF chemical laser into a fundamental frequency light that is compatible with the Bessel shaping lens group (8); the Bessel shaping lens group (8) is used to shape the fundamental frequency light into a long focal depth Bessel non-diffraction filament.

5. A laser unlocking device based on a Bessel beam according to claim 4, characterized in that: The wavelength conversion lens group (7) is composed of ZnSe crystal and Ge lens, which converts HF chemical laser into fundamental frequency light.

6. A laser unlocking device based on a Bessel beam according to claim 4, characterized in that: The Bessel orthopedic lens assembly (8) includes a concave conical lens (14), a convex conical lens (15), and a beam-shrinking lens assembly (16); the concave conical lens (14) is made of Al-Be material, and the convex conical lens (15) is made of fused silica material.

7. A laser unlocking device based on a Bessel beam according to claim 1, characterized in that: The lock cylinder calibration and coaxial purging module (103) includes a lock cylinder calibrator (9) and a coaxial gas nozzle (10); the lock cylinder calibrator (9) is used to identify the internal structure of the lock cylinder and locate the target; the coaxial gas nozzle (10) is used to remove the slag generated during cutting.

8. A laser unlocking device based on a Bessel beam according to claim 7, characterized in that: The lock cylinder calibrator (9) has a built-in CMOS vision sensor (17), a 650nm red light indicator (18), and a control system (19); the CMOS vision sensor (17) uses an image recognition algorithm to locate the position of the lock cylinder pins and blades in real time; the control system (19) dynamically adjusts the operating parameters according to the positioning results.

9. A laser unlocking device based on a Bessel beam according to claim 8, characterized in that: The coaxial gas nozzle (10) is an annular nozzle, which introduces nitrogen gas during operation; the control system (19) dynamically adjusts the nitrogen gas flow rate according to the lock cylinder type.

10. A laser unlocking device based on a Bessel beam according to claim 1, characterized in that: The lightweight load-bearing frame (104) includes a magnesium-lithium alloy skeleton (11) and a carbon fiber shell (12); the carbon fiber shell (12) is embedded with a microchannel liquid cooling pipeline (13); the coolant in the microchannel liquid cooling pipeline (13) flows directly through the Bessel optical shaping module (102).

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