42 results about "Axicon" patented technology

The invention discloses a pipeline inner wall panoramic three-dimensional scanning device and a measuring method, and the device comprises a panoramic plane laser generator which comprises a point laser generator, an axicon, a laser focusing lens, a conical surface reflector and a transparent cylindrical support, and is used for transmitting a 360-degree panoramic plane laser beam to the inner wall of an object to be measured; according to the invention, single-exposure full-circumferential high-precision three-dimensional measurement is realized, and the device can synchronously obtain complete three-dimensional point cloud data of the circumference of the inner wall of the whole pipeline at the moment of single exposure through innovative combination of a panoramic annular imaging system and a panoramic planar laser projection technology; the method has the advantages that axial rotary scanning or multi-view data splicing required by a traditional method is avoided, measurement efficiency is improved, splicing accumulative errors are avoided, laser stripe image acquisition is complete and free of breakpoints, and completeness and accuracy of three-dimensional reconstruction data are guaranteed from the source.

The invention belongs to the technical field of radiation effect and radiation hardening of semiconductor devices and integrated circuits, and particularly relates to a single event effect laser simulation system based on Bessel beam shaping. A Bessel beam shaping and focusing module based on an axon lens is introduced and composed of the axon lens and two lenses, namely a single lens and a focusing lens, a Gaussian beam of an incident beam is shaped into a quasi-Bessel beam, and the quasi-Bessel beam is utilized to irradiate a semiconductor device to be detected. The axial distribution of the light beam is kept unchanged in a range of hundreds of microns, and the focusing breaking through the diffraction limit is realized in the radial distribution, so that the effect closer to the heavy ion charge deposition track is generated. The technology can solve the problem that a multilayer structure device, a thick sensitive region device and a wide forbidden band device are difficult to test through traditional laser simulation, and has important practical value for promoting laser simulation of the single event effect.

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

The invention relates to a method for curing a liner for the rehabilitation of pipes or channels, in which laser light from the curing of a resin-impregnated liner is used, and to the use of an axicon for generating an annular beam profile of a laser for curing a liner for the rehabilitation of pipes or channels.

This invention relates to the field of semiconductor lasers, and more particularly to a multi-chip ring array vertical cavity surface-emitting laser (VCSEL), comprising: a gain chip array, a beam-splitting axial conical lens group, a beam-combining axial conical lens group, and an output coupling mirror arranged coaxially. The gain chip array includes N (N>1) VECSEL gain chips arranged in M ​​concentric rings (M>1). The beam-splitting axial conical lens group includes M beam-splitting axial conical lenses. The beam-combining axial conical lens group includes M beam-combining axial conical lenses. The N laser beams first pass through the beam-splitting axial conical lens group to generate M-order Bessel beams, and then pass through the beam-combining axial conical lens group to combine into a resonant beam. This resonant beam resonates within the coaxial resonant cavity formed by the output coupling mirror and the gain chip array, resulting in the output laser beam. This invention employs a modular cascaded structure of axial conical lenses, realizing the parallel superposition of multiple rings of chips, fully utilizing the radial spatial dimension, and improving chip integration density.

The application discloses a three-piece Bessel beam shaping system with a diffraction ring, and belongs to the technical field of laser processing, comprising: a beam shaping mirror, a first collimating mirror and a focusing mirror; the incident surface and the exit surface of the beam shaping mirror are annular planes and annular aspheric surfaces respectively, and are used for shaping a collimated Gaussian beam into a point annular beam with energy gradually decreasing from inside to outside; the incident surface and the exit surface of the first collimating mirror are annular aspheric surfaces and annular planes respectively, and are used for collimating the point annular beam; the incident surface of the focusing mirror is a combination of an axicon surface and a spherical surface, and the exit surface is a plane; the focusing mirror is used for focusing the collimated point annular beam into a Bessel beam with a diffraction ring. The application can significantly improve the focal depth of the Bessel beam in laser processing, and can also effectively remove processing materials such as ink. In addition, the focal depth of the Bessel beam in the application is adjustable, and the adjustment mode is more, the flexibility is higher, and is suitable for different laser processing scenes.

The present invention provides a light source device and method that utilizes a parallel optical module including an axicon lens to efficiently collect diverging light, collimate it, and adjust the wavelength of the desired light to pass through. A tunable wavelength light source device according to one embodiment of the present invention includes a diffused light source that irradiates diffused light, a parallel light module that collimates the light irradiated from the diffused light source, the parallel light module including an axicon lens, an angle-adjustable bandpass filter module that passes light that has passed through the parallel light module and selects a specific wavelength of the light, and a mixing module that corrects an error in wavelength that is determined by the angle of incidence of light that passes through the angle-adjustable bandpass filter module.

The present invention provides a light-generation system (1000) including a first light-generation device (110), a luminescent body (1200), a thermally conductive element (500), and an axicon-like optical element (400), wherein: (A) the first light-generation device (110) is configured to generate first device light (111), the first light-generation device (110) including one or more of a superluminescent diode and a solid-state laser; (B) the luminescent body ( (1200) includes a luminescent material (200) configured to convert at least a portion of the first device light (111) into luminescent material light (201), the luminescent body (1200) having an annular shape; and (C) a thermally conductive element (500) configured (a) to be in thermal contact with at least a portion of the luminescent body (1200), and (b) to convert at least one of the first device light (111) and the luminescent material light (201). (D) the axicon-like optical element (400) comprises a first portion (410) and a second portion (420) and has an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; (E) the axicon-like optical element (400) comprises: (a) a first portion (410) and a second portion (420) and having an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; A light generating system is provided that is configured to (a) receive at least a portion of a first device light (111) via a portion (410) and provide an annular beam of the first device light (111) to a luminescent body (1200) via a second portion (420), and (b) collect at least a portion of a luminescent material light (201) via the second portion (420) and provide a beam of luminescent material light (201) via the first portion (410).

This variable light beam shaper comprises a diffractive optical system. The diffractive optical system includes a first diffractive optical element and a second diffractive optical element. The diffractive optical system generates a center spot beam from a first beam and generates a ring beam around the center spot beam from a second beam. One of the first diffractive optical element and the second diffractive optical element is configured to be rotatable about the optical axis of the diffractive optical system with respect to the other one of the first diffractive optical element and the second diffractive optical element. The first diffractive optical element and the second diffractive optical element are a first spiral axicon diffractive optical element and a second spiral axicon diffractive optical element, or are a first spiral diffractive optical element and a second spiral diffractive optical element each having a periodic phase distribution in the radial direction.

The invention discloses a four-focus long-focal-depth broadband achromatic superlens design based on an improved weighted GS algorithm, and belongs to the field of micro-nano optics. The super lens comprises a silicon dioxide substrate and a titanium dioxide cylindrical nano column array. In the initial iteration stage of the GS algorithm, focusing and axicon superposition phases are adopted to construct a complex amplitude field, and a dynamic amplitude weighted feedback mechanism is introduced. According to the design, four off-axis focuses with highly uniform energy are realized on a target focal plane, and focal length drift caused by broadband dispersion is covered by using an expanded super-long focal depth. Simulation shows that within the range of 640-740 nm, the average focal depth of the device reaches 6.33 microns, the focus intensity deviation is smaller than 5%, the average focusing efficiency is 62.47%, and broadband achromatic focusing is effectively achieved. The method has a wide application prospect in the fields of parallel laser processing, high-throughput imaging and the like.

The invention relates to a processing optic (10) for generating a trifocal distribution for welding hot-dip galvanized sheets, comprising: a. a central beam-shaping element (1) between a collimation lens (2) and a focusing lens (3), b. a double wedge device (4) for generating two satellite spots through which a part of the laser beam is guided, c. a diffuser (5) for generating a central spot through which a further part of the laser beam is guided, wherein the diffuser (5) comprises an axicon array.

The invention discloses a microchip single-frequency pulse vortex light laser generating device which comprises a pump light source, an output collimating mirror, a focusing lens, an axicon and a microchip resonant cavity which are sequentially and coaxially arranged. A space light beam or an optical fiber coupling light beam emitted by the pump light source is expanded and collimated by the output collimating lens, then converted by the focusing lens and the axicon and shaped into an annular light beam without orbital angular momentum, the annular light beam is irradiated to the microchip resonant cavity, the microchip resonant cavity is moved in the direction of a light path, and the orbital angular momentum is formed. The positions of the microchip resonant cavity and the focus of the focusing lens are adjusted, transverse mode matching in the resonant cavity is achieved, single-mode intracavity oscillation is generated, and a single-frequency pulse vortex beam is output by controlling the inclination angles of the front surface and the rear surface of the microchip resonant cavity.

The invention discloses a terahertz continuous zooming imaging device, and relates to the field of terahertz active imaging. The device mainly comprises a zoom optical module and a detection optical module. The zooming function is mainly realized by a zooming optical module in front of an imaging object, and the optical module comprises a collimating lens, a negative axicon disc, a segmented axicon and a free-form surface lens. Light emitted by the light source is collimated by the collimating lens and then is emitted in parallel. Annular light with different diameters is obtained by rotating the negative axicon disc and combining with the segmented axicon, and the annular light is focused at different positions after entering different annular areas of the free-form surface lens, so that the zooming function is realized. And the detection optical module is used for collecting a transmission signal of the detected target and obtaining a terahertz transmission image of the detected target based on the transmission signal. According to the system, focal length adjustment is carried out by rotating the negative axicon disc, a large-size lens does not need to be moved, the mechanical structure is simplified, the imaging speed is increased, and meanwhile the movement alignment error is reduced; and the required device can be manufactured by adopting a common 3D printing or machining mode, has the advantages of high imaging speed, easiness in adjustment and low cost, and has outstanding application value in the aspects of terahertz rapid security inspection and nondestructive detection.

The invention relates to a focus depth controllable Gaussian-Bessel beam generation method, a focus depth controllable Gaussian-Bessel beam generation device and a storage medium, and belongs to the technical field of laser processing. In the optimization process, a standard axicon phase corresponding to a target non-diffraction propagation length is introduced as a fixed initial value, the problems of slow convergence and uncontrollable focal depth caused by a random or zero initial value in a traditional method are avoided, rapid, flexible and controllable focal depth is realized, and by obtaining the actually measured light intensity along the optical axis direction, the target non-diffraction propagation length is optimized. Compared with numerical simulation light intensity point by point, a difference field matrix is constructed and fed back to an optimization process to iteratively update a phase function, so that not only is the uniformity of axial intensity improved, but also attenuation caused by tail energy collapse and environmental noise under a long focal depth condition is effectively inhibited, and the method has high robustness and practicability. The technology is suitable for scenes with extremely high requirements on uniformity and focal depth, such as laser precision processing, long focal depth microscopic imaging, optical communication and the like.

The present invention provides a light source apparatus and method for integrating diffused light with high efficiency using a collimating including an axicon lens, collimating it, tuning the wavelength of desired light, and passing it. A tunable wavelength light source apparatus of the present invention according to one embodiment comprises a diffuse light source for irradiating diffused light, a collimating module for collimating the light irradiated from the diffuse light source, wherein the collimating module comprises an axicon lens, an angularly tunable bandpass filter module for passing the light that has passed through the collimating module to select a specific wavelength of the light, and a mixing module for correcting a spatial error of a wavelength specified according to an angle of incidence of the light passing through the angularly tunable bandpass filter module.

The invention discloses a wavefront sensor based on an axicon, a method, equipment and a medium. The wavefront sensor comprises a focusing lens, the axicon, a collimating lens and a detection camera. The focusing lens, the axicon, the collimating lens and the detection camera are sequentially arranged along the optical axis direction; the vertex of the axicon is located on the rear focal plane of the focusing lens, and the detection surface of the detection camera is located on a plane conjugated with the vertex of the axicon. Compared with a traditional multi-side-face pyramid, by utilizing the rotational symmetry characteristic of the axicon, the machining difficulty is remarkably reduced, high-precision machining is easy to achieve, and the high-precision wavefront sensing requirement is met; meanwhile, the wavefront sensor based on the axicon can accurately sense small-amplitude aberration, is suitable for an extremely-high-precision wavefront sensing scene, can be cascaded with a front-end adaptive optical system to realize wavefront high-precision control, can also realize iterative sensing of large-amplitude aberration, and is used for realizing iterative correction of large-amplitude aberration in a closed-loop adaptive optical system.

The invention relates to a headlight for vehicles with at least one light source (1) for emitting light (4), with an optical unit comprising a projection lens (3) for deflecting the light (4) so ​​that a predetermined light distribution with a light / dark boundary is generated in a vehicle foreground, wherein the projection lens (3) has a Fresnel structure (15), wherein the projection lens (3) is designed as an axicon lens (3), wherein a Fresnel structure (15) is provided on an inner side (13) of the axicon lens (3).

The present invention relates to a new method for making metasurfaces comprising liquid gating. VO2 is an exemplary substrate for use in the present invention. The inventive metasurfaces can be used as a planar lens, vortex generator, beam deflector, and axicon, inter alia. The inventive methods allow metasurfaces to be formed readily on curved or flexible surfaces.

An optical system includes a phase retardation plate which controls a polarization of an input laser beam, an axicon lens spaced apart from the phase retardation plate on an emitting surface side thereof to convert the input laser beam into a single first Bessel beam having a single cone angle, a collimating lens spaced apart from the axicon lens on an emitting surface side thereof to collimate the single first Bessel beam in a form of a single second Bessel beam having an annular energy distribution, a polarizing beam splitter spaced apart from the collimating lens on an emitting surface side thereof to split the single second Bessel beam into third Bessel beams having different polarization directions, and a focusing lens spaced apart from the polarizing beam splitter on an emitting surface side thereof to focus the plurality of third Bessel beams to form an output laser beam.

This shaping device for shaping a beam includes a beam shaper functioning as a lens in which a central portion of an axicon lens is formed as a concave lens.

The invention discloses a diffraction element for generating an annular light source and a design method thereof, and belongs to the technical field of diffraction optics. The design method comprises the following steps: establishing a plane wave and spherical wave incident ray tracing model based on a geometrical optics theory; performing diffraction surface optical path difference and phase distribution calculation according to a ray tracing model; fitting the calculated phase distribution data into a grid phase surface type supported by optical simulation software; light path optimization is carried out in the grid phase surface type obtained through fitting until the annular light spots are converged; micro-nano structure parameters of the diffraction element corresponding to convergence of the annular light spots are calculated, the design of the diffraction element is completed, and the micro-nano structure parameters comprise the etching depth, the diffraction order, the minimum line width and the duty cycle. The problems that a traditional iterative algorithm is large in calculation amount and large in simulation deviation, a traditional axis prism system is large in size and low in efficiency, and an existing diffraction element is difficult in phase singular point fitting are solved, and high-precision and high-efficiency annular light source generation is achieved.

The invention relates to a headlight for vehicles with at least one light source (1) for emitting light (4), with an optical unit comprising a projection lens (3) for deflecting the light (4) so ​​that a predetermined light distribution with a light / dark boundary is generated in a vehicle foreground, wherein the projection lens (3) has a Fresnel structure (15), wherein the projection lens (3) is designed as an axicon lens (3), wherein a Fresnel structure (15) is provided on an inner side (13) of the axicon lens (3).

The disclosure provides a multi-band multi-line slab CO2 laser, comprising two pairs of discharge electrodes, two radio frequency power supplies, two long rectangular concave spherical end mirrors, a first diaphragm, a concave spherical output mirror, a second diaphragm, a reflective plane diffraction grating and a third diaphragm. The concave spherical output mirror, the second diaphragm, the grating and the third diaphragm are located on the central axis of the laser; the two pairs of discharge electrodes and the two end mirrors are symmetrically located on both sides of the central axis; the first diaphragm is arranged in a row on the side of the mirror surface close to the end mirror; the second diaphragm is close to the output mirror; the third diaphragm is close to the grating; the long rectangular concave spherical end mirror, the grating and the concave spherical output mirror form a folded near-axicon stable resonant cavity; the laser beam is output from the concave spherical output mirror along the central axis, and the spectrum of the laser contains multiple transition spectral lines of the CO2 laser in the wavelength range of 9 μm-11 μm, which belong to four transition bands of 10P, 10R, 9P and 9R, namely the P branch and the R branch of the 00°1-10°0 band and the 00°1-02°0 band.

An axiconal photonic neural network is provided. The axiconal photonic neural network can include interconnected axiconal neurons to produce a classification using laser light. A first axiconal neuron of the interconnected axiconal neurons can include a material to non-linearly interact with the laser light, the material including a thickness determined with a machine learning technique. The first axiconal neuron can include an axicon to receive the laser light from the material and produce a ring profile. The axiconal photonic neural network can include a waveguide positioned at the ring profile to guide the laser light of the ring profile to a second axiconal neuron of the interconnected axiconal neurons.

The present application relates to the field of laser technology, in particular to a kind of tunable multi-wavelength hollow laser based on translation-rotation collaborative regulation crystal axicon, the pump beam emitted by fiber-coupled semiconductor laser array is collimated by first convex lens, focused by second convex lens, and focused to laser gain medium by plano-concave mirror;Plano-concave mirror and plane mirror form laser resonator, and negative glass axicon diverges parallel light beam in laser resonator into conical light beam, and emits parallelly after the refraction of positive glass axicon;Through the collaborative regulation of synchronous rotation first crystal axicon / second crystal axicon and moving second crystal axicon, the loss of each laser wavelength in laser resonator is dynamically adjusted, so that the oscillation threshold of multiple wavelength lasers in laser resonator is equal, and then the simultaneous stable operation of multi-wavelength laser is ensured.The present application not only can efficiently realize the synchronous output of multi-wavelength hollow laser, but also can provide flexible dynamic tuning capability between multiple wavelengths for device.

System for determining the topography of the cornea of ​​an eye, comprising an element for generating rings similar to Placido disks and an illumination unit arranged in an illumination beam path, as well as an image acquisition unit arranged in a detection beam path and a control and evaluation unit, characterized in that the element for generating rings similar to Placido disks is a fresneled axicon (1) with ring-shaped structures of different radii, that an optical element for full-surface illumination of the fresneled axicon (1) with ring-shaped, plane waves and an optical element for separating the illumination and detection beam paths are arranged between the illumination unit and the fresneled axicon (1), that the imaging system (7.1) and an image sensor (7.2) are arranged in a control and evaluation unit.2) existing image acquisition unit (7) is designed for telecentric, distance-independent image acquisition and that the ring-shaped structures of different radii are arranged in the form of facets (1.3) with different facet angles on the front and / or back (1.1, 1.2) of the fresneled axicon (1), wherein the facet angles of the facets (1.3) of the fresneled axicon (1) are calculated such that the deflection of the light at small deflection angles is preferably based on the principle of light refraction and at large deflection angles on a combination of light reflection and light refraction.

The present invention discloses a laser filament cutting device, which includes an axicon, a long-focal-length lens, a galvanometer assembly, and a field lens. The laser beam is converted into a Bessel beam by the axicon, which is then projected onto the galvanometer assembly via the long-focal-length lens. The Bessel beam is deflected by the galvanometer assembly, and then interfered with by the field lens to form a linear focus with a long focal depth, thereby achieving rapid cutting on the surface of a workpiece. The Bessel beam has a long focal depth. After being reflected by the galvanometer assembly, it passes through the field lens and is projected onto the workpiece surface. Even if the beam deflects, causing the distance between the field lens and the projection point to change, the projection point remains within the focal depth range, and the cutting effect is not affected.

Systems, methods, computer-readable media, and techniques using a diffractive-refractive axicon pair, may include: (A) a diffractive axicon; and (B) a refractive axicon in optical communication with the diffractive axicon, wherein the diffractive axicon is configured to direct a light beam towards the refractive axicon, and wherein the refractive axicon is configured to accept the light beam and output a substantially annular beam of light from the light beam.