23 results about "Axicon" patented technology

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.

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 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 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 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 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.

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 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.

The invention discloses a groove bottom morphology detection optical system of a high-aspect-ratio groove microstructure. An overall frame is composed of an illumination system and a detection system. The illumination system has the characteristic of double-layer light beam modulation. Firstly, a spatial light modulator is utilized to modulate an incident fundamental mode Gaussian beam into Laguerre-Gaussian vortex light, so that the beam is spontaneously converged in a transmission process, and initial size compression is realized; and then secondary modulation is carried out on the light beam through the micro-axicon array to generate a Bessel-Laguerre array light beam which is extremely fine and high in energy density. The beam diameter of a sub-beam of the array beam is extremely small, and the sub-beam can be focused by a microscope objective to be incident to the bottom of the high aspect ratio groove structure with the micron-order width, so that groove bottom morphology detection is realized. The detection system utilizes a confocal microscopic imaging technology to collect reflected light at the bottom of the tank and focus the reflected light in a CCD (Charge Coupled Device) to obtain a morphology image of the bottom of the tank. According to the method, nondestructive testing of the morphology of the bottom of the micron-sized high-aspect-ratio precise groove is realized by utilizing an optical means.

An exposure apparatus includes a light source emitting light, an axicon lens converging the light emitted from the light source, and a fly-eye lens portion receiving the light converged from the axicon lens, and the axicon lens and the fly-eye lens portion are aligned next (adjacent) to each other.

The application discloses a kind of plane hollow vortex light field lasers, including fiber-coupled output semiconductor laser array (1), plano-convex lens (2), axicon lens (3), laser gain medium (4) and axicon lens (5). Fiber-coupled output semiconductor laser array (1) is the pump source of laser;Pump beam coupling system is composed of plano-convex lens (2) and axicon lens (3), generates focusing annular beam for exciting vortex phase laser to run in resonant cavity;Axicon lens (3) conical surface and axicon lens (5) cylindrical surface constitute the resonant cavity of laser, for obtaining the center as circular hollow plane vortex light field laser. Plane hollow vortex light field laser can be used for the inside processing and cutting of cylindrical material, high-precision plane scanning or plane polishing and the like.

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

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.

Laser processing head (1A; 1B), comprising: a first lens group (11) into which laser light emanating from a light emitter (3) enters and which is designed to focus laser light, wherein the first lens group (11) is a lens group having a positive refractive power; a second lens group (12) to which the laser light which has passed through the first lens group (11) propagates, wherein the second lens group (12) is a lens group which has a positive refractive power; a third lens group (13), wherein the laser light which has passed through the second lens group (12) is propagated to the lens group, wherein the third lens group (13) is a lens group which has a negative refractive power; a fourth lens group (14) into which the laser light, which has passed through the third lens group (13), enters and which is designed to focus the laser light, wherein the fourth lens group (14) is a lens group which has a positive refractive power; an optical light flux conversion element (15) which can be arranged along an optical axis between the first lens group (11) and the second lens group (12) and is designed to convert a beam profile of the laser light; a first movement device (17) designed to move the first lens group (11) in a direction along the optical axis; a second movement device (18) configured to move the third lens group (13) in the direction along the optical axis; and a third movement device (19) configured to move the optical light flux conversion element (15) to a position along an optical axis between the first lens group (11) and the second lens group (12) and to a position outside the optical axis, wherein the first lens group (11), the second lens group (12), the third lens group (13) and the fourth lens group (14) form an optical transfer system (10) which forms an image of the light emitter (3) at a transfer position (6), wherein, if the optical luminous flux conversion element (15) exists along the optical axis, the optical luminous flux conversion element (15) is also included in the components of the optical transfer system (10), and wherein the optical luminous flux conversion element (15) is an axicon.

A lens system including: a first asphercal axicon lens element having a first refractive surface and a second refractive surface; a second aspherical axicon lens element having a third refractive surface similar to the second refractive surface and a fourth refractive surface similar to the first refractive surface, and an aperture stop located between the first asphercal axicon lens element and the second aspherical axicon lens element. The first aspherical axicon lens element and second aspherical axicon lens are mutually oriented such that the second refractive surface and third refractive surface are mutually facing. The first aspherical axicon lens element and the second aspherical axicon lens element are configured to minimize chromatic aberration for at least a spectral range of radiation relayed by the lens system.

The application relates to the technical field of optical beam shaping, and particularly provides a Bessel beam sidelobe suppression system and method based on phase selection, which comprises a light source, an axicon phase map library and a spatial light modulator. The axicon phase map library stores pre-optimized multi-layer axicon phase maps for different working distances. The spatial light modulator is used for loading the multi-layer axicon phase maps to perform phase modulation on a Gaussian beam provided by the light source, so that a Bessel beam with suppressed sidelobe energy is generated. The method comprises the following steps: according to an actual working distance, calling a corresponding multi-layer axicon phase map in the axicon phase map library, and loading the selected multi-layer axicon phase map to the spatial light modulator to realize sidelobe energy suppression in the Bessel beam generation process. The application solves the problems of large filtering energy loss and poor flexibility of the diffraction element in sidelobe suppression in the conventional scheme.

The invention is suitable for the technical field of laser additive manufacturing, and provides a laser additive manufacturing optical system of a circular polarization point ring composite light spot, which comprises a linear polarization laser lambda1, a linear polarization laser lambda2, an adjustable linear polarizer 1, an adjustable linear polarizer 2, an axicon 1, an axicon 2, a 1 / 4 wave plate 1-5, a polarization beam combiner (PBC) and a beam expanding scanning focusing system, a light-emitting optical axis of a laser lambda1 is coaxial with an adjustable linear polaroid 1, a 1 / 4 wave plate 1 and a 1 / 4 wave plate 3, a light-emitting optical axis of a laser lambda2 is coaxial with an axicon 1, an axicon 2, an adjustable linear polaroid 2, a 1 / 4 wave plate 2 and a 1 / 4 wave plate 4 and is perpendicular to the optical axis of the lambda1, a transmission axis and a reflection axis of a polarization beam combiner PBC are coaxial with the optical axes of the lambda1 and the lambda2 respectively, and two beams of light are coaxial with a 1 / 4 wave plate 5 after being combined through the PBC. Finally, entering a beam-expanding scanning focusing system; according to the method, circular polarization regulation and control and point-ring composite light spot characteristics are integrated, light spot parameter dynamic adjustment and high-reflection metal reflection suppression are achieved, and the forming quality is remarkably improved.

The invention discloses a lossless measurement system and method for parameters of a micropore with a large depth-diameter ratio, and belongs to the technical field of optical lossless measurement, the lossless measurement system comprises a light source, an adjusting assembly, an axicon, a semi-transparent and semi-reflective mirror and a focusing microscopic imaging assembly which are sequentially arranged along a light path, and a displacement table and a data processing assembly which are used for bearing the measured micropore, after the clear aperture of a collimated light beam emitted by the light source is limited by the adjusting assembly, the focal depth of the collimated light beam is expanded through the axicon, and the collimated light beam is transmitted through the semi-transparent and semi-reflecting mirror, enters the focusing microscopic imaging assembly and is finally focused in a micropore to illuminate the bottom and the side wall of the micropore; the displacement table drives the micropore to move along the optical axis to complete focusing, the data processing assembly calculates the aperture of the micropore according to the image information and the system amplification factor and determines the depth of the micropore through the displacement in the focusing process, and therefore lossless accurate measurement of the parameters of the micropore with the large depth-diameter ratio is achieved.