47 results about "Airy beam" patented technology

The invention relates to a method and a device for generating a radial or angled polarization self-focusing Airy beam. The method includes regulating polarization states of a collimating Gaussian beam to obtain a linear polarization Gaussian beam polarizing along a certain direction; performing light splitting to obtain a transmission beam, emitting the obtained transmission beam vertically to a spatial light modulator loaded with a phase information graph and then emitting the beam out in a reflecting manner after phase modulation; performing light splitting to obtain a reflected beam, subjecting the reflected beam to Fourier transformation and then converging the reflected beam by a convex lens so as to obtain a linear polarization self-focusing Airy beam through an annular stop at the focus point of the convex lens; and finally carrying out radial or angled polarization conversion to obtain the radial or angled polarization self-focusing Airy beam. By the method, self focusing can be carried out without any optical focusing elements, the light intensity in front of the focus point is low, the light intensity at the focus point is increased, energy is concentrated, and accurate positioning is achieved. The method can be applied to the fields of particle arrestance, biological medicines and the like, and belongs to the technical field of applied optics. In addition, the device is simple in structure and high in stability and is adjustable.

The invention relates to a beam transmission and conversion technology, and discloses a method for producing partially coherent Airy beams. The method comprises the following steps that: a laser device emits a fully coherent gauss beam, and a convex lens and a rotary frosted glass sheet regulate the coherence of the gauss beam to get a partially coherent gauss beam; and after being collimated by a second convex lens, the partially coherent gauss beam is subjected to beam intensity distribution shaping by a gauss amplitude filter, a spatial light modulator to which a phase information graph is loaded modulates the phase of the partially coherent gauss beam, and a first-stage diffracted beam is captured through a circular aperture diaphragm, thus obtaining the partially coherent Airy beam. The method produces the partially coherent Airy beam by directly using the gauss beam, and is scientific in principle and easy to realize; and the device for implementing the method is simple in structure, easy to regulate, excellent in stability and low in production cost. The beam provided by the method can be practically used in the fields of optical particle cleaning, biomedical therapy, particulate trapping, electron acceleration, and the like.

The invention discloses an all-dielectric-metasurface-material-based Airy beam generator. The Airy beam generator is a square array phase plate formed by arranging a plurality of periodic units. Eachperiodic unit comprises a substrate layer, and the substrate layer is provided with a nano column with a square section; when transmission light passes through the array phase plate, the obtained periodic unit with the phase difference of 0 is a first array block, and when the transmission light passes through the array phase plate, the obtained periodic unit with the phase difference of pai is asecond array block. In the array phase plate, in the x-axis direction, when an initial wave packet phi of the Airy beam is larger than 0, the periodic units in the same column select the first array block, and when the initial wave packet phi of the Airy beam is smaller than 0, the periodic units in the same column select the second array block. The Airy beam can be simply and conveniently generated without a complex optical system, and the Airy beam generator has the advantages of being small in size, simple in structure and low in cost.

The invention discloses a method for generating real space and K space Airy beam arrays based on a metasurface, and belongs to the field of micro-nano optics. The method comprises the following steps: performing analog calculation on the nano antenna by adopting a simulation method, accurately and effectively regulating and controlling the propagation distance and the propagation track of an emergent Airy beam by adjusting the size and azimuth angle distribution of a nano column array, and selecting to obtain the nano antenna meeting the metasurface composition requirement; after the geometric dimensions of the nano-column units are determined, obtaining the dimensions and azimuth angle distribution of the nano-column arrays covering 0-2pi phases according to a phase distribution algorithm for generating real space and K space Airy beam arrays, i.e., determining the dimensions and rotation angles of each nano-column unit, and coding and generating a processing file of a corresponding medium metasurface structure; processing the broadband medium metasurface by utilizing a processing file and adopting a micro-nano processing technology; when different circularly polarized light beams are incident, obtaining Airy beam arrays in a real space and a K space, thereby improving the parallel working efficiency of the device remarkably.

The invention discloses a method for flexibly regulating and controlling the self-focusing focal length of a self-focusing light beam. According to the method, a phase hologram that has a secondary phase factor and is generated by using a computer holographic technology is loaded to a spatial light modulator; the self-focusing focal length of a round Airy beam is regulated and controlled by changing the coefficient of the secondary phase factor and the round Airy beam with the required self-focusing focal length is generated, so that the halo distribution is clear and the focusing effect is good. The cubic phase hologram is generated by utilizing a computer holographic technology, so that the cost is hardly required; focusing effects of lenses with different focal lengths on the round Airybeam can be reflected; and compared with the mode of generating the round Airy beam by using Fourier space, the disclosed method does not need a Fourier transform lens. Moreover, the regulation and control mode is convenient to operate; the self-focusing focal length can be regulated and controlled more flexibly; and a specific research task can be completed.

The invention provides a lens and a method for generating an Airy beam based on a phase discontinuous super-surface, relates to the technique of generating an Airy beam, and aims to solve the problemthat the excitation device of the existing Airy beam is bulky, difficult to integrate, and cannot be applied to the X-band. The lens comprises a plurality of structural units arranged in line along astraight line; each structural unit comprises a dielectric plate and metal rings on the lower surface of the dielectric plate, the two metal rings are the same size, the centers of the two metal ringsare coincided with the center of the dielectric plate, the metal rings are provided with notches, and the notches of the two metal rings are symmetric about the center; the plurality of structural units are divided into multiple groups, the notches of the metal rings on the upper surfaces of the same group of structural units are the same in the direction, the notches of the metal rings of two groups of the structural units sandwiched with one group of the structural unit are the same in the direction, and the notches of the metal rings of adjacent groups of the structural units are differentby 90 DEG in the direction. The lens and the method are suitable for generating Airy beams.

The invention relates to a design method of a freely-adjustable angular airy beam mask plate. The complex amplitude transmittance function t of the angular airy beam mask plate is obtained according to the complex amplitude of an angular airy beam, a conical lens factor and the phase of a blazed grating; and the phase of the complex amplitude transmittance function t of the mask plate is solved according to a calculation holographic principle, so that the freely-adjustable angular airy beam mask plate can be obtained. An angular airy beam of which the main lobe spatial position and side lobe number can be freely adjusted can be generated at the remote field of the mask plate; the spatial position of the main lobe of the angular airy beam and the number of the side lobes of the angular airybeam are controlled respectively by their respective parameters; and since the spatial position of the main lobe of the angular airy beam and the number of the side lobes of the angular airy beam canbe adjusted freely, the mask plate has a very bright application prospect in micromanipulation technology.

The invention discloses a method for generating an Airy beam with an initial emission angle. On the basis of the diffraction theory and the definition of the Airy function, an Airy beam is generated through deviating the center of an Airy beam cubic phase plate from the optical axis of a Fourier transforming lens, and the deviating distance can be used for changing the transmission track of the Airy beam. The larger the deviating distance, the larger the initial emission angle of the Airy beam. Based on the above principle, a theoretically calculated local area of a cubic phase diagram, deviating from the center, is selected to manufacture a phase mask plate. An incident light beam irradiates the local phase mask plate to generate an Airy beam with an initial emission angle. Phase mask plates manufactured for different areas of the phase diagram can be used for generating Airy beams with different initial emission angles. According to the invention, the local area of the phase diagram is used for manufacturing the phase mask plate. Therefore, the problems in the prior art that a traditional phase modulation element is limited in size, the initial emission angle of the Airy beam is limited in regulation and control range, and a large-size phase modulation element is too high in manufacturing cost can be solved effectively.

Systems and methods utilizing two Airy beams to process a non-rounded edge of a glass substrate or to cleave a glass substrate are disclosed. The method includes generating first and second Airy beamsand causing them to cross at a crossing to define a curved intensity profile in the vicinity of the crossing point where the first and second Airy beams have respective local radii of curvature RA and RB. The method also includes scanning the curved intensity profile either along the non-rounded outer edge or through the glass along a scan path to form on the glass substrate a rounded outer edgehaving a radius of curvature RE that is smaller than the first and second local radii of curvature RA and RB. The radius of curvature RE can be adjusted by changing a beam angle between the first andsecond Airy beams.

The invention discloses a system and a method for generating terahertz waves by circular Airy three-color field laser. The system comprises a laser, a first spectroscope, an optical parametric amplifier, a first reflector, a first reflective spatial light modulator, a half-wave plate, a first focusing lens, a BBO crystal, a first off-axis parabolic mirror, a second spectroscope, a second reflector, a second reflective spatial light modulator and a third reflector which are sequentially arranged on a light path. Two beams of laser are converted into circular Airy beams from Gaussian beams through the two reflective spatial light modulators suitable for different wavelengths, and then third-frequency laser is generated through the BBO crystal. And the circular Airy three-color field laser is focused at one point to excite the air plasma to generate terahertz waves. The terahertz wave energy generated by the device is relatively strong, the spectrum is relatively wide, terahertz radiation source application and spectral measurement are facilitated, and the device has relatively strong scientific research and practical application values.

The invention relates to a device for realizing dual-polarization Airy obstacle avoidance signal transmission based on single SLM spatial partition, and belongs to the field of communication. The waveform generator generates a signal and loads the signal to the Mach-Zehnder modulator; signals are transmitted in an optical carrier, divided into two beams of mutually perpendicular Gaussian light ina polarization state through a polarization beam splitter, enter a space channel through a collimator, enter an upper half area and a lower half area of an SLM respectively, are reflected by the SLM,penetrate through a lens and form Airy beams, and the two beams of Airy beams in the polarization state are coupled through a beam combiner and then are transmitted to a receiving end through an optical fiber. Two Airy beams are formed through only one spatial light modulator to realize obstacle-bypassing transmission, and signals are loaded on the Airy beams in a dual-polarization state through apolarization multiplexing technology, so that the channel capacity is doubled, and the system and signal transmission cost is reduced.

The invention discloses an Airy beam coherent elastography upper and lower eyelid adjusting device for conjunctiva detection, and relates to the technical field of ophthalmology department auxiliary devices, the Airy beam coherent elastography upper and lower eyelid adjusting device comprises a fixing frame, an Airy beam mechanism, a fine adjustment mechanism, a connection moving mechanism and a mounting frame, an adjusting opening mechanism and an Airy beam mechanism which are matched with each other are arranged in the fixing frame through a linkage mechanism, and a fine adjustment mechanism is arranged at the top of the fixing frame. According to the eyelid distraction device, the adjusting distraction mechanism, the linkage mechanism and other structures are arranged, the adjusting distraction mechanism and the Airy beam mechanism synchronously move under the action of the linkage mechanism, the output end of the Airy beam mechanism is initially located at the center point of the adjusting distraction mechanism, and therefore after the upper eyelid and the lower eyelid are supported to be open through the adjusting distraction mechanism, the upper eyelid and the lower eyelid can be distrained. The Airy beam mechanism can accurately capture eyes, and the examination effect of the Airy beam mechanism is greatly improved.

The invention discloses a dual-encryption free space optical communication method and system capable of avoiding obstacles. According to the technical scheme, the semiconductor laser generates chaos in two modes of external light injection and light feedback; chaos synchronization is realized by using a master laser and a slave laser with the same structure; meanwhile, a digital encryption technology is adopted, namely, a chaotic signal generated by a Lorentz system is used as a secret key to encrypt plaintext information, and then a ciphertext is hidden in a chaotic carrier for transmission, so that dual encryption is realized. Meanwhile, the Airy beam with the self-healing characteristic is adopted for free space optical communication, small obstacles can be effectively overcome, atmospheric turbulence disturbance can be effectively resisted, and communication performance is improved.

The invention discloses an Airy beam ultra-deep optical coherence elastography system device, and relates to the technical field of elastography. The Airy beam ultra-deep optical coherence elastography system device comprises two groups of supporting cylinders and adjusting blocks, wherein a second screw rod is mounted between the two groups of adjusting blocks, a sliding block sleeves the outer side of the second screw rod, and a control mechanism is mounted at the top end of the sliding block; and the bottom end of the sliding block is connected with a fine adjustment air cylinder, and a power supply mechanism is mounted at the output end of the fine adjustment air cylinder. According to the Airy beam ultra-deep optical coherence elastography system device, movable sliding rails, a probe, the power supply mechanism and a power connection strip are arranged, power is supplied to the probe through a power connection plate, the probe operates normally to inspect eyeballs, when different positions need to be inspected, a second motor is started, the second motor drives an output shaft and a clamping gear to rotate, the clamping gear drives belts to rotate through clamping teeth, and the belt drives a clamping plate to slide in the movable sliding rails through the clamping teeth and an insertion rod, so that the angle and the position between the probe and the eyeball are changed, and inspection is facilitated.

The invention discloses a method to prepare a nanometer material based on Airy light field of surface plasmons. The method includes: first, exciting Airy beam on SPP; then, coupling the laser in the free space to a metal surface by using one-dimensional double slits on the metal surface, to form SPP waves transmitted in various direction along the surface; forming a tunable light field by two SPPwaves transmitted face to face on a metal surface between two double-slits structures, the tunable light field being a nano lens array, and incident cold molecular beam focusing on the effect of the tunable light field, thereby depositing on the metal surface in a resolution of nanoscale, to obtain a nanometer material. The invention is easy to control, move or modify, convenient to use and high in integration.

A method for processing a transparent workpiece that includes directing a laser beam output by a beam source onto a phase-adjustment device such that the laser beam downstream the phase-adjustment device is an Airy beam and directing the Airy beam onto a surface of the transparent workpiece. The Airy beam forms an Airy beam focal region in the transparent workpiece, the Airy beam of the Airy beam focal region having a maximum intensity of 100 TW/cm² or less, the Airy beam of the Airy beam focal region induces absorption in the transparent workpiece, the induced absorption producing a curved defect in the transparent workpiece.

A method includes directing a laser beam onto a phase-adjustment device such that the laser beam downstream the phase-adjustment device is a modified Airy beam having a modified Airy beam focal region having a main lobe and a plurality of side lobes. The main lobe has a lobe aspect ratio of 1.2 or greater.