65 results about "Acousto optic deflector" patented technology

The invention relates to a super-resolution fluorescence lifetime microscopic imaging method and system based on pixel relocation. The method comprises the following steps: S1, carrying out multi-focus parallel scanning on a sample by using an acousto-optic deflector; s2, synchronously collecting a fluorescence intensity image and fluorescence lifetime data through an area array detector and a point detector; and S3, carrying out super-resolution reconstruction on the fluorescence intensity image based on a pixel relocation algorithm, and mapping fluorescence lifetime data to a reconstructed image to generate a super-resolution fluorescence lifetime microscopic image. According to the invention, an AOD is adopted to replace a scanning galvanometer in a traditional TCSPC-FLIM imaging system as a light beam scanner; addressing scanning of AOD, image acquisition of EMCCD and life data acquisition of PMT and TCSPC cards are closely linked by combining well-designed multiple paths of synchronizing signals, and fluorescence life data are distributed to each dot matrix through a later data processing method, so that organic combination of super-resolution and FLIM can be realized without complicated equipment, and SR-FLIM images of samples are obtained.

The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement, and belongs to the technical field of quantum computing. The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement. A static optical tweezers array is generated through a spatial light modulator to capture initial atoms, an optimal rearrangement path is planned by adopting a Hungary algorithm, and dynamic optical tweezers are generated through an acousto-optic deflector to implement atom grabbing, moving and releasing operation. According to the method, a weighted Gerchberg-Saxton algorithm is innovatively combined with real-time image feedback, so that the precise rearrangement of the atom array is realized. Important experimental technical support is provided for quantum calculation and simulation, and the application progress of the neutral atom array in the fields of quantum error correction, fault-tolerant quantum calculation, quantum simulation and the like is effectively promoted.

The invention belongs to the technical field of laser, and discloses a laser beam splitting and combining device based on an acousto-optic deflector pair and application thereof, and the laser beam splitting and combining device comprises a transmitting optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module which are sequentially arranged; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; the transmitting optical fiber module is used for transmitting laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the diaphragm is used for blocking secondary diffracted light except the primary diffracted light; and the receiving optical fiber module is used for receiving the laser emitted from the second acousto-optic deflector. Therefore, the technical problems that in the prior art, the laser beam splitting function and the laser beam combining function are mutually independent, two kinds of operation cannot be considered in the same device, and real-time regulation and control over the light beam operation mode are lacked are solved.

The invention belongs to the related technical field of laser micro-nano machining, and particularly relates to a 2.5 D micro-pattern laser machining method based on an acousto-optic deflector and a galvanometer, which is realized by adopting a laser device based on combination of an acousto-optic deflection module and the galvanometer, and comprises the following steps: in single track scanning of the galvanometer, according to a preset pulse machining sequence corresponding to a machined pattern, carrying out laser processing on the machined pattern according to a preset pulse processing sequence corresponding to the machined pattern; frequency control signals corresponding to the pulses are input into the two acousto-optic deflectors respectively, so that laser pulse distribution formed on the machined part after single-time track scanning of the galvanometer is shown as the pulse superposition number in the depth direction and the lap joint rate between adjacent pulses in the normal direction of the advancing direction of the galvanometer; the pulse superposition number of each pulse position in the depth direction reflects the processing depth of the pulse position, and the pulse number and the pulse overlap rate of each positioning position in the normal direction of the moving direction of the galvanometer are determined according to the section width and the contour radian in the width direction of a processing graph. According to the invention, the processing of any 2.5 D micro-pattern can be realized.

The application relates to the field of laser micro-nano processing, in particular to a laser micro-nano processing device based on an acousto-optic deflector and a rotating mirror and a use method thereof, which comprises a pulse laser, a mirror group, an acousto-optic deflection module, a signal control unit, a beam splitting module, a rotating mirror and a flat-field focusing lens arranged in sequence; the acousto-optic deflection module comprises a first acousto-optic deflector and a second acousto-optic deflector, the first acousto-optic deflector and the second acousto-optic deflector are orthogonally arranged, the first acousto-optic deflector is arranged in parallel with the rotating shaft of the rotating mirror, the second acousto-optic deflector is arranged in perpendicular to the rotating shaft of the rotating mirror, through the arrangement of the two orthogonally arranged acousto-optic deflectors, the laser beam can be flexibly controlled to be deflected to any position in a rectangular scanning area, and in combination with the polygon rotating mirror, the polygon rotating mirror can be rotated only once along a processing track, the acousto-optic deflector can compensate and fill a processing pattern, and the technical effect that any shape can be realized is achieved.

Aspects of the present disclosure relate generally to systems and methods for use in the implementation and / or operation of quantum information processing (QIP) systems, and more particularly, to the use of deflectors in trapped ion QIP systems for individually addressing long ion chains. Methods are described for using acousto-optic deflectors (AODs) in optical Raman transitions to implement single-qubit gates and two-qubit gates. A QIP system is also described that is configured to use AODs in optical Raman transitions to implement single-qubit gates and two-qubit gates.

The invention relates to a mobile laser scanning microscope (100) comprising: a chassis (10) with rollers (12), an optical table (30) connected to the chassis (10) via a vibration damper (20), an upper optical box (40) containing a scanning head (42) with acousto-optical deflectors, a pillar (60) connecting the upper optical box (40) to the optical table (30) and holding it at a distance above therefrom, a stage (31) arranged on the optical table (30), a microscope module (32) arranged above the stage (31) and comprising a microscope objective (33) optically coupled to the scanning head (42) and at least one detector (75a, 75b), at least one laser (35) arranged on the optical table (30), an optical beam path (36) guiding a beam of the at least one laser (35) from the at least one laser (35) through the upper optical box (40) to the objective (33), compartments (17) connected to the chassis (10) below the optical table (30) and housing power supplies (15) and control systems (16) of the microscope (100), and a light barrier system (50) having a cover (52) covering units arranged on the optical table (30).

The invention relates to a method for scanning an area with a multi-photon laser scanning microscope comprising an acousto-optic deflector. The method according to the invention comprises scanning an area of the disk in an X-Y plane perpendicular to the optical axis of the microscope objective by applying a frequency drive signal to the deflector, the drive signal having a first term targeting the center of the disk and having a second term for scanning the periphery of the disk. The invention further relates to a multi-photon laser scanning microscope comprising a drive system configured to perform the method.

The invention discloses a particle directional and fixed-point transport system and method based on asymmetric astigmatism light field regulation and control, and belongs to the technical field of optical micro-control. The system comprises a laser, a cylindrical lens, a first plano-convex lens, a second plano-convex lens, a first reflector, a second reflector and a microscope objective. The cylindrical lens is controlled in an off-axis mode to enable a light beam to be incident vertically in an off-axis mode, and light intensity deviation perpendicular to the optical tweezer line direction is formed on the focal plane of the cylindrical lens. And converting the offset into light intensity gradient distribution along the optical tweezers line direction by using a reflector group, and generating the asymmetric linear optical tweezers after focusing by a microscope objective. The light field generates a directional net scattering force to drive the particles to move unidirectionally along the optical tweezers line direction while maintaining stable capture of the particles. Active modulation devices such as an acousto-optic deflector and a spatial light modulator are not needed, particle directional transportation can be achieved only through cooperative regulation and control of optical elements, and the device has the advantages of being simple in structure, low in cost and high in light field stability and is suitable for biomedical microoperation and particle control in a micro-fluidic chip.

The present application relates to the field of optical imaging technology, and in particular to an ultra-high-throughput single-pixel real-time holographic microscopy imaging system. The system includes a laser pre-modulation unit and a beam expansion lens group, a first acousto-optic deflector, a conversion lens group, a second acousto-optic deflector, and a photoelectric conversion unit arranged in sequence along the propagation direction of light. Since the first preset direction is orthogonal to the second preset direction, an orthogonal two-dimensional frequency comb pattern can be generated, so that the two-dimensional frequency comb pattern has good spatial frequency modulation performance, and achieves a good effect of natural modulation of the laser beam without the need for pixel-by-pixel structured light modulation as in the prior art. The system of the present application has ultra-high throughput, achieving the technical effects of a small number of measurements, high algorithm complexity, fast imaging speed, simple system optical path structure, strong robustness, and high imaging quality. At the same time, the present application can realize continuous single-pixel holographic microscopy imaging, can be controlled at high speed, and has a good real-time imaging monitoring effect.

The invention discloses an ultrashort pulse dynamic regulation and control device and method based on double acousto-optic deflectors, and belongs to the technical field related to laser. The device comprises an acousto-optic deflector group and a 4f optical system, the 4f optical system is formed by biconvex lenses with two times of focal length, and the optical axis is parallel to the horizontal plane; the 4f optical system changes the positive and negative of the symbols of acousto-optic effect group delay dispersion and improves the range of group delay dispersion; the acousto-optic deflector group is composed of two acousto-optic deflectors which are arranged in parallel and in opposite directions, and the two acousto-optic deflectors are located on the two sides of the 4f optical system respectively and are both perpendicular to the optical axis. First polarized light of an input light beam is converted into second polarized light through the first acousto-optic deflector, the second polarized light is converted into first polarized parallel light beams through the 4f optical system and the second acousto-optic deflector, and an output light beam is obtained. The acousto-optic deflector group provides continuously adjustable group delay dispersion and regulates and controls the pulse width of an output light beam. The device is low in cost, is simple to operate, and dynamically regulates and controls the pulse width of the output light beam.

The present invention provides a laser processing device that achieves excellent productivity without increasing the laser beam spot diameter. The laser beam irradiation unit of the laser processing device includes: a laser oscillator that oscillates laser light; a Y-axis scanner that scans the laser beam emitted from the laser oscillator at high speed along the Y-axis; an X-axis scanner that feeds the laser beam emitted from the laser oscillator along the X-axis for processing; and a condenser. The Y-axis scanner is selected from an acousto-optic deflector, a resonant scanner, and a polygonal scanner, while the X-axis scanner is selected from a galvano scanner or a resonant scanner.

The laser processing system based on the acousto-optic deflector comprises an XYZ motion platform, a laser, an acousto-optic deflection assembly, a galvanometer and a focusing field lens are arranged above the XYZ motion platform, the acousto-optic deflection assembly, the galvanometer and the XYZ motion platform are sequentially arranged along an emergent light path of the laser, and the acousto-optic deflection assembly, the galvanometer and the XYZ motion platform are all electrically connected with a controller. The controller controls the acousto-optic deflection assembly to compensate the movement speed and precision of the galvanometer and the XYZ movement platform in real time. The position of a workpiece to be machined is controlled through the XYZ motion platform, meanwhile, the machining path of a laser beam is modulated through the acousto-optic deflection assembly and the galvanometer, and by means of linkage control among the acousto-optic deflection assembly, the galvanometer and the XYZ motion platform, the acousto-optic deflection assembly compensates the motion speed and motion precision of the XYZ motion platform and the galvanometer in real time; therefore, high-speed and high-precision laser processing without frequent start and stop of the XYZ motion platform and the galvanometer is realized, and the fault rate and the wear rate of frequent start and stop of the XYZ motion platform and the galvanometer are reduced.

The invention relates to the technical field of laser processing, in particular to a method and system for rapidly preparing a micropore array, and the method comprises the following steps: S1, placing a workpiece to be processed on a high-precision three-dimensional motion platform; s2, a laser light path is adjusted, and a laser beam emitted by a laser sequentially passes through a beam shaping system, an acousto-optic deflector and a galvanometer and then is focused on the surface of the workpiece to be machined; s3, the acousto-optic deflector scans according to a pre-edited machining pattern, machining of a single micropore is conducted on the current machining point, and after machining of the single micropore is completed, the galvanometer jumps the laser beam to the next machining point; and S4, the step S3 is repeated until machining of the whole micropore array is completed. The acousto-optic deflector and the galvanometer work cooperatively, the acousto-optic deflector is used for carrying out path scanning according to a pre-edited machining pattern, machining of a single micropore is carried out on a current machining point, and after machining of the single micropore is completed, the galvanometer is used for enabling the laser beam to jump to the next machining point, so that the machining efficiency and the machining effect can be greatly improved; therefore, rapid preparation of the micropore array is realized.

The invention relates to the technical field of optical imaging, in particular to an ultrahigh-flux single-pixel real-time holographic microscopic imaging system. The system comprises a laser pre-modulation unit, and a beam expanding lens group, a first acousto-optic deflector, a conversion lens group, a second acousto-optic deflector and a photoelectric conversion unit which are sequentially arranged along the propagation direction of light. Because the first preset direction is orthogonal to the second preset direction, an orthogonal two-dimensional frequency comb pattern can be generated, so that the two-dimensional frequency comb pattern has good performance of spatial frequency modulation and achieves a good effect of natural modulation on a laser beam, and structured light modulation is not required to be performed pixel by pixel in the prior art. The system provided by the invention has the technical effects of ultrahigh flux, few measurement times, high algorithm complexity, high imaging speed, simple system light path structure, strong robustness and high imaging quality. And meanwhile, continuous single-pixel holographic microscopic imaging can be realized, high-speed regulation and control can be performed, and a good real-time imaging monitoring effect is achieved.

The invention belongs to the technical field of quantum physics and quantum, and particularly relates to an AOD optical tweezers array automatic correction method and system based on a neural network, and the method comprises the following steps: generating an initial AOD optical tweezers array through an acousto-optic deflector; acquiring an image of the initial AOD optical tweezers array, and preprocessing the image; inputting the preprocessed image into a first neural network and a second neural network; calculating a global frequency compensation amount according to the average position deviation and a pre-calibrated frequency-position relation factor; generating an intensity compensation table covering a full frequency domain through an interpolation method based on the intensity gain compensation factors of the optical tweezers; and updating the driving frequency of the AOD according to the global frequency compensation amount, updating the driving amplitude of each channel of the AOD according to the intensity compensation table, and outputting the corrected AOD optical tweezers array. By integrating the neural network model and the closed-loop control process, the full automation of the position and intensity correction of the optical tweezers array is realized.

The invention relates to a scanning device (1) for a light microscope (100) with an acousto-optic deflector (10) for deflecting a first illumination light beam (L1) of a first wavelength and a second illumination light beam (L2) of a second wavelength, which differs from the first wavelength, and a control unit (13) for generating sound waves of a first frequency range and a second frequency range separate from the first frequency range in the acousto-optic deflector (10), wherein the first frequency range and the second frequency range are selected such that the first illumination light beam (L1) is deflected by the sound waves of the first frequency range and the second illumination light beam (L2) is deflected independently of the first illumination light beam (L2) by the sound waves of the second frequency range.as well as a light microscope (100) with the scanning device (1) and a method for deflecting a first and a second illumination light beam (L1, L2).

The invention discloses a laser tracking and pointing control method and device based on an acousto-optic deflector, and the device comprises a pulse laser source, an optical antenna module, an acousto-optic deflection module and a synchronous control module, and comprises the steps: generating narrow-linewidth pulse laser, and splitting the narrow-linewidth pulse laser into intrinsic light and detection light; the synchronous controller applies driving signals with horizontal and vertical deflection frequencies to the acousto-optic deflection module, and after direction driving is stable, the optical antenna module triggers and emits the probe light; after the reflected light reflected by the target object is received, coherent detection is carried out on the reflected light and the intrinsic light, a beat frequency electric signal is generated, the beat frequency electric signal is processed, and existence of the target object is determined; recording deflection frequency (fx1, fy1) when the target object is hit, taking the deflection frequency as reference frequency, and converting the deflection frequency into local scanning taking the reference frequency as the center of a scanning view field; and the reference frequency is tracked and corrected by repeated tracking and aiming.

The invention belongs to the technical field of light spot quality simulation optimization, and provides a light spot quality simulation optimization method based on an acousto-optic deflector and galvanometer cooperative system, and the method comprises the steps: simulating light field distribution in a high-speed motion state in simulation, obtaining a dynamic light spot form in real time, constructing a dynamic light spot intensity matrix, and combining a static light spot form to obtain a dynamic light spot intensity matrix; determining a light spot distortion rate corresponding to the time step length in the high-speed motion state; based on the light spot distortion rate corresponding to the time step length in the high-speed motion state, deviation analysis is carried out, and the distortion risk of the light spots in the high-speed motion state is evaluated; if the distortion risk is high, a control variable method is adopted, and simulation testing is conducted on the synchronous error value of the acousto-optic deflector and the galvanometer in the high-speed motion state; according to the method, accurate quantification and risk pre-judgment of light spot distortion are realized, a basis is provided for synchronization parameter optimization of a high-speed scanning system, and systematic control and reduction of the light spot distortion risk in a high-speed motion state are effectively supported.

The invention discloses a high-frequency three-dimensional laser-induced fluorescence imaging system and method based on an acousto-optic deflector, and relates to the field of laser diagnosis technology and combustion field three-dimensional imaging. By integrating a high-frequency laser technology, an AOD (Argon Oxygen Decarburization) rapid scanning technology and a multi-stage synchronous control algorithm, three-dimensional transient diagnosis and dynamic visualization of a high-temperature and high-pressure combustion field are realized, and a high-precision measurement means is provided for combustion efficiency optimization and pollutant generation mechanism research. According to the technical scheme, the imaging system comprises a high-frequency dye laser module, a light path shaping module, an AOD scanning module and a fluorescence imaging module; the high-frequency dye laser module outputs excitation laser with tunable wavelength; the AOD scanning module comprises an acousto-optic deflector scanning system; the fluorescence imaging module comprises a high-frequency camera arranged towards the combustion chamber and a flame collecting system. According to the invention, a dynamic light path shaping and temperature self-adaption algorithm is developed, and the three-dimensional reconstruction precision of a complex combustion field is improved to 0.1 mm level.

An optical scanner can include a sampler to receive a light beam and provide a sampled light beam including a portion of the light beam, a dispersive element to spectrally disperse the sampled light beam along a dispersion direction, one or more detectors to receive at least a portion of the sampled light beam dispersed along the dispersion direction, one or more acousto-optic deflectors (AODs) configured to deflect the light beam from the sampler, and a controller. The controller can determine a centroid of the sampled light beam dispersed along the dispersion direction based on a signal from at least one of the one or more detectors and generate a drive signal for at least one of the one or more AODs to deflect the light beam from the sampler along a selected deflection angle based on the centroid.

A method for efficient parallel filling of atomic arrays based on a reservoir structure is composed of a body array, a reservoir array and a filling transfer array, the loading rate is increased by introducing the reservoir array, and the difficulty that an independent body array framework needs to meet multiple requirements of high loading rate, high-fidelity quantum regulation and control, reading and the like at the same time is avoided; the filling transfer array is composed of two acousto-optic deflectors (namely double-AOD configuration) which are perpendicular to each other and a variable-focus lens, and therefore efficient movement with three spatial dimension freedom degrees and parallelization characteristics for multiple atoms is achieved. The randomly loaded array is imaged, so that the moving path and the corresponding control for filling and transferring the array can be quickly calculated according to the initial information of the atom distribution; in addition, the array can be imaged after the primary filling transfer is finished to monitor the loss of atoms in the process, so that the secondary filling transfer is implemented to further improve the loading rate.

The invention discloses a physical perception compiling method for parallel execution of a neutral atom array and a related device, and belongs to the field of quantum computation.The physical perception compiling method comprises the steps that a hardware plane is divided into two or more hardware subareas capable of being operated in parallel according to the physical independence of an acousto-optic deflector array; converting a to-be-compiled quantum circuit into a graph model, dividing all vertexes in the graph model into communities corresponding to the number of the sub-regions, and performing iterative optimization to generate a local sub-circuit and a global sub-circuit corresponding to the sub-regions; all the sub-lines are input into a solver to be compiled, mathematical constraints are applied in the compiling process, and executable compiling results are output; according to the method, a hardware calculation plane is divided into two or more hardware sub-regions capable of being operated in parallel according to the physical independence of the acousto-optic deflector array, and a global problem is decomposed into a local problem of parallel processing, so that the calculation complexity is greatly reduced, and the compiling speed is increased in order of magnitude.

The present invention belongs to the field of laser-related technologies and specifically relates to a method for compensating for dispersion in an acousto-optic deflector based on a dispersive prism assembly. The method comprises: configuring a dispersive prism assembly; constraining the monochromatic laser beam spot emitted from the prism assembly to be circular, calculating the incident angles of the laser beam incident on a first dispersive prism and a second dispersive prism when the negative spatial dispersion generated by the prism assembly is equal to or greater than the positive spatial dispersion of the acousto-optic deflector to be compensated; constraining the incident angles of the laser beam incident on the first and second dispersive prisms and the laser beam emitted from the prism assembly to be perpendicular to the receiving surface of the acousto-optic deflector, determining and adjusting the relative spatial position between the two prisms to achieve spatial dispersion compensation; and calculating and adjusting the distance between the center of the dispersive prism assembly and the center of the acousto-optic deflector when the negative temporal dispersion generated by the prism assembly is equal to or greater than the positive temporal dispersion of the acousto-optic deflector to achieve temporal dispersion compensation. The method of the present invention has a wide range of applications for compensating for spatiotemporal dispersion.

The invention discloses a three-dimensional decoupling control device and method for the focal position of optical tweezers, and relates to the field of optical tweezers array control, and the device comprises an arbitrary waveform generator which is used for generating a radio frequency signal matched with the motion trail of target optical tweezers; the four signal amplifiers are respectively connected to the output end of the arbitrary waveform generator and are used for amplifying the radio frequency signals; the two pairs of acousto-optic deflectors are orthogonally arranged, and the input interface of each acousto-optic deflector is connected to the output ends of the four signal amplifiers respectively; the 4f lens group is arranged between the two pairs of acousto-optic deflectors and is used for relaying the light beams and realizing phase conjugation; and the objective lens is arranged behind the second pair of acousto-optic deflectors and is used for focusing the modulated light beam to a target position. Through the phase conjugate design of the cascade AOD and the 4f lens group, active decoupling of radial deflection and axial focusing of a light beam is realized, and through combination of a full-electronic focusing mechanism and FPGA real-time processing, the precision, speed and stability of three-dimensional optical tweezers control are remarkably improved.

This acousto-optical light deflector has a first acousto-optical element (100a) and a second acousto-optical element (100b) that are disposed along the optical path of a light beam (LB). The first acousto-optical element includes a first optical element (10a) and a first transducer (20a) for generating an ultrasonic wave (21a) in the first optical element. The second acousto-optical element includes a second optical element (10b) and a second transducer (20b) for generating an ultrasonic wave (21b) in the second optical element. The first transducer and the second transducer are provided so as to sandwich the optical path of the light beam therebetween. The propagation direction of the ultrasonic wave traveling in the second optical element is inclined with respect to the propagation direction of the ultrasonic wave traveling in the first optical element.

The present application relates to the field of integrated photonics on chip, more particularly, to a high-efficiency on-chip acousto-optic deflector and a preparation method thereof. The acousto-optic deflector comprises a lithium niobate-silicon nitride heterostructure arranged on a silicon oxide substrate, and the lithium niobate-silicon nitride heterostructure comprises a lithium niobate thin film and a multimode coupler structure formed by silicon nitride. An interdigital transducer capable of exciting acoustic waves is arranged on the lithium niobate thin film. In the present application, the piezoelectric property of lithium niobate and the acousto-optic effect are utilized, the interdigital transducer and the multimode coupler principle in the photonic waveguide are integrated, and the Bragg diffraction is generated by the periodic structure formed by the photons and the acoustic waves, so as to finally realize deflection. The above-mentioned acousto-optic deflector reduces the size of the on-chip acousto-optic deflector, enhances the interaction between phonons and photons, and improves the efficiency. The lithium niobate and silicon nitride materials used are stable in properties, easy to process, and can be realized in large-scale integration on chip.

The present invention relates to a method for scanning an area using a multiphoton laser scanning microscope with an acousto-optic deflector. The method comprises scanning an area of ​​a disk located in an XY plane perpendicular to the optical axis of the microscope objective by applying a frequency drive signal to the deflector, the drive signal having a first term targeting the center of the disk and a second term for scanning the periphery of the disk. The invention also relates to a multiphoton laser scanning microscope with a drive system configured to perform this method.

This invention discloses an axial focusing system, a three-dimensional scanning device, and a scanning method based on an acousto-optic deflector, belonging to the field of laser-related technology. The axial focusing system based on an acousto-optic deflector introduces a defocusing amount that changes with the deflection angle of the acousto-optic deflector through a prism. When the deflection angle of the acousto-optic deflector changes, the propagation distance of the beam in the axial focusing system is altered, thereby changing the effective focal length of the equivalent lens. The axial displacement of the beam waist position of the emitted beam changes according to the defocusing amount. Therefore, by adjusting the driving frequency of the acousto-optic deflector, the deflection angle of the beam by the acousto-optic deflector can be adjusted, thus changing the defocusing amount of the axial focusing system and achieving dynamic and rapid axial focusing of the laser.