57results 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 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 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 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 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.