55results about How to "Jiao Shenda" patented technology

The invention discloses a laser direct writing exposure device based on stimulated light emission loss. The laser direct writing exposure device is characterized by comprising an excitation light source, a de-excitation light source, a first space light modulator, a second space light modulator, a half wave plate group, a dichroscope, a phase position type wave zone plate, an amplitude type wave zone plate, a high numerical value aperture achromatic objective and a three-dimension scanning platform. The laser direct writing exposure device provided by the invention can realize the optical exposure of high resolution and long focus depth.

The invention belongs to the field of laser processing, and discloses an annular light spot optical system. The system comprises a collimation unit, a phase modulation unit and a focusing unit which are sequentially arranged along a light path. The phase modulation unit comprises at least one spiral phase plate positioned in the light path; a laser beam can be added with a spiral phase factor to realize phase modulation through a spiral phase plate in an optical path, so the energy distribution of the laser beam is changed into annular distribution. Furthermore, the spiral phase plates can bearranged on the rotating shaft, and the states in the light path and outside the light path are switched by rotating around the rotating shaft, so variable annular light spots can be realized by switching the spiral phase plates. By improving the components of the optical system and the matching action mode among the components, the annular light spot with concentrated energy distribution at the edge, larger diameter and longer focal depth can be obtained, the size of the light spot is further adjustable, and the optical system is suitable for various laser processing fields such as laser cutting and the like.

The invention relates to a system and a method for optical and digital mixed imaging. The system comprises an optical imaging object lens, a rational form wavefront coder, a photoelectrical detector and a digital image decoding and processing unit. The method adopts the rational form wavefront coder to code a wavefront phase of an incident light wave. Phi RPM(x) as an introduced phase distribution function is equal to sigma sign(x)an|x|(1+ sigma bm|x|), wherein x is a normalized radial coordinate; N and M are the highest power of a fraction and denominator polynomial respectively; {an} and {bm} are undetermined coefficients; and sign is a signum function. An intermediate blurred image which is not sensitive to defocusing is acquired on the photoelectrical detector after coding, and the digital image decoding and processing unit carries out deconvolution wave filtration on the intermediate blurred image to acquire the final clear image.

The invention discloses a laser device of a long-focal depth and small-focal spot lens focusing system. The laser device includes a laser source, laser, a first surface, a first optical element, a second surface, a third surface, a second optical element, a fourth surface, an image point imaged by the first optical element, an image point imaged by a lens group, and an optical screen; the laser source emits the laser; the lens group includes the first optical element and the second optical element arranged on the optical path of the laser; the first optical element includes the first surface and the second surface; and the second optical element includes the third surface and the fourth surface. The laser device of the invention has the advantages of simple structure, low manufacturing cost and small size, and can satisfy requirements for miniaturization; and the materials and positions of the optical elements in the laser device are properly set, and related parameters of the laser source are properly selected, and therefore, the system device can further have the advantages of long focal depth, small focal spot and low requirements for workpiece flatness.

The invention discloses a large view field super resolution imaging device which comprises a base and a super-surface, wherein the base and the super-surface are successively arranged in the bottom-up sequence. The super-surface is composed of nano-unit structure arrays which are arranged in succession on an ultra-thin metal or a dielectric film. A nano-unit structure is a deep sub-wavelength structure. According to the invention, geometric phase on the nanostructure is used to control the electromagnetic wave symmetry; electromagnetic waves are converted from rotation symmetry to translational symmetry to acquire large view field perfect focusing near 180 degrees; if curved face or multi-plane combination is used, large view field imaging can be realized; the work bandwidth can cover the entire electromagnetic spectrum; the resolution is close to or even beyond the diffraction limit; and the device has a wide application prospect in the field of large view field super resolution imaging.

The invention discloses a topology-number-adjustable vortex light beam generation device, system and method. The topology-number-adjustable vortex light beam generation device comprises two spiral phase mirrors, wherein the phases of the two spiral phase mirrors are respectively set as A[theta]2 and -A[theta]2, the two spiral phase mirrors are sequentially disposed on an optical path, and the topological number of the obtained vortex light beam is increased by 1 by increasing the angle difference of the two spiral phase mirrors. According to the invention, after passing through the device, a laser beam can be added with a spiral phase factor to realize phase modulation, so that the energy distribution of the laser beam is changed into annular distribution; the topological number of the obtained vortex beam is adjusted by rotating one or two spiral phase mirrors to control the angle difference of the two spiral phase mirrors so as to realize an annular light spot with an adjustable size; and a group of spiral phase mirrors with second-order nonlinear spiral structures are designed and superposed to generate vortex light beams with adjustable topological numbers, so that annular light spots with concentrated energy distribution at the edge, larger diameter, longer focal depth and adjustable size are formed.

The invention discloses a novel optical lens acquiring long focal depth Bessel gauss light beams through focusing. The novel optical lens comprises a multi-zone curved surface and a focusing curved surface, wherein the multi-ring curved surface and the focusing curved surface are coaxially superposed, the multi-ring curved surface is provided with rings in a concentric-circle structure, surfaces of the rings are spherical surfaces or aspheric surfaces, ring-shaped optical axes are arranged among the adjacent rings, and the focusing curved surface is a spherical surface or an aspheric surface. The single lens is employed for focusing, so the Bessel gauss light beams are acquired, the energy distribution density at the center scope is quite high, quite-low focusing light beam segments are distributed at the edge, the power density scope is high, light spots are quite small, the focal depth is quite long, and light spot peak value power densities in the focal depth segment are similar. According to the novel optical lens, assembly precision requirements of the lens are common, the lens has relatively wide universality for laser beam modes, the fine laser processing technology can be improved and ameliorated, especially for the cutting technology of transparent materials.

The invention discloses a method of the spot joint seal in the optical fiber close-spaced linear array. The process is: 1) one end of the standard single mode optical fiber is draw to the micro optical fiber with diameter of 5-25 mum which includes the standard optical fiber and the transition region; 2) Many micro optical fiber which the end is interval and parallel are lain on the silicon base plate coated the magnesium fluoride on the surface with the V groove or the magnesium fluoride base plate with the rectangle groove; 3) the glass sheet coated the magnesium fluoride on the surface or the magnesium fluoride board is set on the micro optical fiber to form the micro optical fiber close-spaced array fixed with the base plate by the ultraviolet glue; 4) the end of the standard optical fiber is connected with the semiconductor laser by the FC interface and the close-spaced micro optical fiber array outputs the spot array. So the invention can improve the imaging precision of the laser phototypesetting system and the focal depth but decrease the demand of the position precision when the film exposures.

The invention discloses a construction method of a modified single-focus fractal zone plate and a zone plate thereof. The method comprises a step of determining a total number M of spiral high-transmittance bands on a corrected single-focus fractal zone plate based on the element number of a Cantor sequence of an Sth level and carrying out fractal on the modified single-focus fractal zone plate according to the Cantor sequence of the Sth level, a step of determining an alpha1 value of the modified single-focus fractal zone plate capable of generating a single main focus with a plurality of secondary focuses or determining an alpha2 value of the modified single-focus fractal zone plate capable of generating two equal-intensity main focuses with a plurality of secondary focuses, and a step of constructing the corresponding modified single-focus fractal zone plate based on the obtained alpha1 value or alpha2 value and an internal and external radius formula of the spiral light-transmittance bands of the modified single-focus fractal zone plate. The zone plate designed by the invention can only generate a first-stage focus or first-stage and second-stage focuses in an axial direction,so that a low-chromatic-aberration image can be generated, the multi-plane simultaneous imaging, particle capturing and photoetching are realized.

The invention discloses a dual-frequency long-focal-depth ultrasonic transducer based on stack arrangement. The dual-frequency long-focal-depth ultrasonic transducer based on stack arrangement comprises a shell, a sound insulation layer, a backing material layer, low-frequency-band ultrasonic piezoelectric array elements, high-frequency-band ultrasonic piezoelectric array elements, a signal line and an aspheric acoustic matching layer; and the low-frequency-band ultrasonic piezoelectric array elements and the high-frequency-band ultrasonic piezoelectric array elements adopt a one-dimensional stack arrangement structure. The curved surface structure of the aspheric acoustic matching layer is reversely deduced by an equal sonic path distance principle and a wavefront function, and the aspheric acoustic matching layer is arranged between the low-frequency-band ultrasonic piezoelectric array elements and the high-frequency-band ultrasonic piezoelectric array elements. A scheme of combining one-dimensional stack arrangement of the dual layers of ultrasonic piezoelectric array elements and an aspheric focusing structure is adopted, so that acoustic characteristics of large depth of field and broadband ultrasonic excitation and reception can be obtained. The invention belongs to aspheric focusing long-focal-depth dual-frequency ultrasonic detectors, and belongs to the technical field of ultrasonic/photoacoustic imaging and nondestructive testing.

The invention relates to a presbyopia correction device based on an improved fractal zone plate. According to the radius alpha, fractal level S, and light transmission ratio w within the period of the improved fractal zone plate, focusing of objects at different distances can be realized. A common artificial crystal material for the cataract surgery and the traditional binary phase type optical element process are used for processing. The improved fractal zone plate device can be used for presbyopia correction, thereby realizing clear object watching at a distant vision distance, a conversation distance, a computer working distance, or a reading distance. Therefore, a demand of clear imaging of objects at several kinds of distances by the presbyopia patients can be satisfied; the system has a simple structure; and convenient processing is realized. The device has the potential value in the presbyopia correction field.

The invention provides a software lens method which is characterized by comprising the following steps: adding a mask at an optical pupil of an optical system; coding optical information after a light path passes through the mask and imaging a blurred image on a CCD; decoding the optical information by using a digital signal processing system, so that the MTF value of the system is correspondingly improved, thereby recovering a sharp and clear image; imaging two images for frequency domain conversion, extracting high-frequency parts of the two images and aligning and fusing the images. By adopting the software lens method, the system is not sensitive to focal depth, and the resolution ratio of the image can be improved.

The invention belongs to the optical field, aims at solving the technical problem of serious chromatic aberration when the traditional Fresnel lens is used for imaging, and discloses a phase coded Fresnel lens. The phase coding technology is introduced to the field of the Fresnel lens. The surface shape of the phase coding element and the surface shape of the converging lens are integrated and then collapsed so that the vector height difference between the highest point and the lowest point of each ring band is lambda/(n-1), and finally the surface shape of the phase coded Fresnel lens is obtained, wherein lambda is the design wavelength and n is the refractive index of the base material. The phase coded Fresnel lens has the focusing function of the traditional diffraction imaging lens andalso has the phase coding function of the phase coding element. The Fresnel lens designed by this method can perform phase coding on the incident light so as to broaden the focal depth, reduce the sensitivity of the Fresnel lens to the wavelength and broaden the bandwidth of the Fresnel lens without reducing the imaging resolution of the Fresnel lens.

A position-phase type iris with long focus depth and ultra-high difinition features that the concave ring and convex ring, which are concentric with iris, are made on a parallel plate made of transparent material. After light beam passes through the iris with concave and convex rings, a retardation between said light beam and the light beam passing through other position is half of wavelenglth, so axial peaks are cancelled to elongate focus depth by more than 3 times and radical edges are cancelled to increase difinition. It can be used in microelectronic processing, photoetching and scan microscopic focusing or imaging system.

The invention discloses an aspheric artificial lens for resisting postoperative residual refractive error, the artificial lens comprises an optical main body (1), a first support loop (2) and a second support loop (3), the optical main body (1) adopts aspheric design represented by a Q-type polynomial, an optical area has a focal depth extension function, optical imaging excess resolution is reasonably utilized, and the operation fault-tolerant rate is improved; light artificial lens deviation is better adapted, the sensitivity of focal power and image quality to an implantation position is reduced, postoperative residual refractive error is resisted, and the visual satisfaction is improved; meanwhile, high-order aberration is considered, and high resolution is kept.

The invention discloses a microlens array acquiring adjustable double focuses. The microlens array is a column surface type lens array and is novel in structure design. The long focal depth characteristic is realized based on the microlens array; focused spots can change from a single focus to double focuses and a distance between the double focuses is adjustable with use of a focusing mirror andby rotating in a column surface cross line direction of the microlens array based on a micro-surface spectroscopic characteristic, and the focal depth of a focused beam of the double focuses is increased greatly. The microlens array acquiring the adjustable double focuses is applied to laser welding, can especially help to reduce lapping width of boards and lower clamping requirements of boards, reduces various defects of highly reflective boards in welding, improves welding seam quality and lengthens welding depth.