30results about How to "Diffraction suppression" patented technology

A diffractive optical element according to the present invention includes: a body 1 being composed of a first optical material containing a first resin, and having a diffraction grating 2 on a surface thereof; and an optical adjustment layer 3 being composed of a second optical material containing a second resin, and provided on the body 1 so as to cover the diffraction grating 2. The first optical material has a refractive index which is smaller than a refractive index of the second optical material; the refractive index of the first optical material has a wavelength dispersion which is greater than a wavelength dispersion of the refractive index of the second optical material; and a difference in solubility parameter between the first resin and the second resin is no less than 0.8 [cal/cm³]^1/2 and no more than 2.5 [cal/cm³]^1/2.

A microlens array includes a unit cell group and a first lens and a second lens which are arranged in the unit cell group, in which the direction of the first lens in plan view is different to the direction of the second lens in plan view. In this manner, it is possible to suppress diffraction caused by regularity of the lenses. Accordingly, it is possible to realize the microlens array with high light utilization efficiency.

To provide a substrate for optics for enabling the color shift caused by diffraction of light to be reduced, a substrate for optics (12) is provided with a fine-structure layer including dots (31) comprised of a plurality of convex portions or concave portions extending in the direction of from a main surface of a substrate to outside the surface, the fine-structure layer has a plurality of dot lines in which a plurality of dots is arranged with a pitch (Py) in the first direction inside the main surface of the substrate, while having a plurality of dot lines in which a plurality of dots is arranged with a pitch (Px) in the second direction orthogonal to the first direction inside the main surface of the substrate, and both of the pitch Py and the pitch Px are inconstant intervals and are of nano-order.

There is provided a finger-vein authentication apparatus including a light source for illuminating one surface of both side-surfaces of a fingertip of a finger with light, and an image sensor for imaging the other surface of the fingertip, the light source and the image sensor being positioned at both sides of a nail of the fingertip with the nail sandwiched therebetween, wherein a fingertip guidance jig for supporting the fingertip and a finger-root guidance jig for supporting a finger-root of the finger are disposed between the light source and the image sensor, a light-shielding unit being disposed on the light-source side, the light-shielding unit being used for shielding the illumination light such that the illumination light will not travel to a ball side of the finger.

The invention provides an optical antenna, a phased array laser radar and a two-dimensional scanning method of the optical antenna. The optical antenna comprises an SOI substrate, a waveguide structure layer, a spacer layer, an annular grating structure layer and a protection layer; a waveguide structure layer is formed on the top silicon layer of the SOI substrate; the spacer layer, the annular grating structure layer and the protection layer are sequentially arranged on the waveguide structure layer; the waveguide structure layer comprises a radiation type strip-shaped waveguide array, speckle conversion structures and a circular flat plate coupling region, wherein the radiation type strip-shaped waveguide array is connected with the circular flat plate coupling region through the speckle conversion structures; the difference value of the refractive index of the annular grating structure layer and the refractive index of the spacer layer and the difference value of the refractive index of the annular grating structure layer and the refractive index of the protection layer are both greater than a preset threshold; and the refractive index of the annular grating structure layer ishigher than the refractive indexes of the spacer layer and the protection layer. Light waves can be successfully emitted upwards and inhibited from being emitted downwards, so that high radiation efficiency is obtained; the radiation type strip-shaped waveguide array can be divided into multiple groups; and the light of the strip-shaped waveguide groups in different directions work in a time-division manner, so that two-dimensional scanning can be realized.

Binary information previously recorded in an innermost rim side area is enabled to be stably reproduced. A record medium is formed by sequentially laminating a first information layer 2, an intermediate layer 3, a second information layer 4, and a cover layer 5 onto a substrate 1. First grooves are previously formed in the innermost rim area of the substrate 1. Second grooves are previously formed in an area where data is recorded. The first grooves are set to be shallower and narrower than the second grooves. Thus, such a situation that a BCA signal is modulated by diffraction due to the grooves can be reduced.

The invention provides a single-scale surface acoustic wave type wavelet transform processor which is characterized by comprising a piezoelectric substrate material, wherein an input transducer and an output transducer are manufactured on the piezoelectric substrate material; the strip area of the input transducer is designed according to the enveloping area of a single-scale Morlet dyadic wavelet function; and the output transducer is an interdigital transducer with equally-overlapped and uniform-period strips. The single-scale surface acoustic wave type wavelet transform processor provided by the invention can be used for overcoming the defects in the prior art and has a diffraction inhibition function.

Disclosed is a two-dimensional trench-oriented micro-strip patch antenna, which is characterized in that: firstly, the operating frequency f of the patch antenna is established; secondly, the metal plate material is selected and the thickness of the metal plate is h; thirdly, a micro-strip patch antenna is arranged in the central region of the metal plate and is fed with electricity by making use of the coaxial line; fourthly, N1 ring-shaped trenches are cyclically arrayed and distributed on the exit surface of the metal plate with a cycle of P1, a depth of d1 and a width of w1; finally, N2 traditional ring-shaped trenches are cyclically arrayed and distributed outside the trenches with a cycle of P2, a depth of d2 and a width of w2, and the manufacturing is finished; and the invention adopts a theory that the trench structure modulates the surface wave in order to improve the antenna radiation performance and a theory that the traditional trench structure inhibits the metal plate edge surface wave in order to reduce backward radiation, both of which are integrated and used in the micro-strip patch antenna, so as to improve the front to back ratio of antenna radiation energy and obtain significantly enhanced radiation gains, and meanwhile the antenna beam width can be substantially compressed.

The invention discloses an extremely ultraviolet high-order diffraction suppression grating. According to the extremely ultraviolet high-order diffraction suppression grating, a plurality of polygonal transparent through holes having the same shape and area are formed in a light-proof thin film, the polygonal transparent through holes are randomly distributed in a quasitriangular array in the light-proof thin film, thus the extremely ultraviolet high-order diffraction suppression grating can effectively suppress high-order diffraction, including 2n, 3n, 4n and 5n-order diffraction (n is a non-zero integer), at various bands of visible light, extremely ultraviolet light and infrared light, eliminates harmonic pollution, completely suppresses background noise, reduces the influence of noisy points to the greatest extent, improves the resolution and sensitivity, simplifies the process difficulty, and provides technical guarantee and process support for effective suppression of the extreme ultraviolet band.

The embodiment of the invention provides a vector beam electrically-controlled generation device which comprises a laser generator, a phase delayer, a q board and an imaging device,wherein the laser generator generates incident laser; the phase delayer is arranged at the light emergent side of the laser generator for carrying out phase delaying processing on the incident laser; the q board is usedfor carrying out vector polarization processing on a beam subjected to phase delaying processing; the imaging device is arranged at the light emergent side of the q board and is used for presenting alight spot formed on the imaging device by light emerging from the q board; the q board is formed by utilizing femtosecond laser to etch a micro-nano structure on a glass board; and the micro-nano structure on the q board shows a shape continuously changed along with a polar angle in a direction of a fast axis of the micro-nano structure. By design of the micro-nano structure on the q board, a segmented phenomenon is avoided, and quality of emergent light is improved. Moreover, due to additional arrangement of the phase delayer, phase delaying processing can be changed by regulating a size ofa voltage so as to avoid waste of time and effort, which is caused by manual regulation or replacement of a wave plate in the prior art.

An artificial eye lens (1) having an optical part (2) which has a first optical side (4) and an opposite, second optical side (5). The optical part (2) has a diffractive grating structure that contributes to an optical imaging property of the optical part (2). The diffractive grating structure is an amplitude grating (6) formed in the optical part (2) as a laser structure. A method for producing an artificial eye lens (1) where the amplitude grating (6) is produced with a laser apparatus (17), and a pulsed laser beam (22) having a pulse length of between 100 fs and 20 ps, a wavelength of between 320 nm and 1100 nm, a pulse repetition rate of between 1 kHz and 10 MHz, a focus diameter of less than 5 μm, and a power density of greater than 10⁶ W/cm².

The invention discloses an interdigital single-side inclined weighted surface acoustic wave type Morlet wavelet processor which comprises a piezoelectric substrate, one end of the piezoelectric substrate is provided with a transmitting transducer, and the other end of the piezoelectric substrate is provided with a receiving transducer. An input electric signal is added to the transmitting transducer, after wavelet transformation is carried out on the input electric signal, the transmitting transducer outputs a surface acoustic wave type wavelet transformation signal, and the surface acoustic wave type wavelet transformation signal is transmitted to the receiving transducer. And when the receiving transducer receives the surface acoustic wave type wavelet transform signal, the surface acoustic wave type wavelet transform signal is converted into an electric signal type wavelet transform signal to be output. And the transmitting transducer adopts an interdigital single-side inclined weighting mode. The invention has the advantages of good function of suppressing beam deviation, diffraction and body wave and simple design. The method is widely applied to various fields of sensors, radars, seismic exploration, atmosphere and ocean analysis and the like.

A plane integrated broadband circularly polarized antenna for emitting or receiving RF signals is composed of a medium substrate as main body and the radiator substrate and feed line network substrate, which are stuck to both sides of main body. Said radiator substrate has symmetrically spiral radiator. Said medium substrate is a photon band-gap one with periodical holes structure. Said feed line network is a balance-unbalance one in coplanar microstrip line-coplanar waveguide-coaxial cable type and is printed on its substrate.

The invention relates to the technical field of microscopy of materials and provides a high-transmittance atomic beam microscopic apparatus including a gas tank, a gas pipe, a vacuum chamber formed byconnecting a first chamber and a second chamber, a jet head, a splitter, a gas transmittance window slice, an atom diffraction slice, through holes in a first-stage Fresnel zone plate transmission area, through holes in a second-stage Fresnel zone plate transmission area, a first detector, a sample, a sample table, a computer, a second detector, a first gas suction port, a first vacuum pump set,a second gas suction port and a second vacuum pump set. The first detector and the second detector respectively detect the atoms that are reflected by the surface of the sample and work under a differential pair mode. The atom diffraction slice with through holes is easy to manufacture, wherein the through holes are orderly arranged according to corresponding Fresnel zones, so that the total areaof through holes in the cross section are of a certain atomic beam flow can be increased, and the transmittance of the atomic beam flow is increased. The apparatus can form a sharp focusing beam spotand inhibit higher-order diffraction, thereby increasing the signal-to-noise ratio of the apparatus.

The invention relates to the technical field of microscopy of materials. A high-resolution surface testing method comprises the following steps that a vacuum pump set is started to vacuumize a cavity,so that the vacuum in the cavity I is better than 1/10 Pa, and the vacuum in the cavity II is better than 1/100 Pa; a gas storage tank outputs gas to an injection head, gas atoms enter the cavity I in a free jet mode, and the gas atoms pass through a splitter and enter the cavity II in an atomic beam flow mode; the atomic beam flow sequentially passes through a gas transmission window sheet and an atomic diffraction sheet and then is emitted to the surface of a sample; a sample stage is horizontally moved in the range of 2*2 microns, so that the surface of the sample can be directly irradiated by an atomic beam; a detector I has higher detection efficiency of atoms with small atomic weight, and a detector II has higher detection efficiency of atoms with large atomic weight; when the gas in the gas storage tank is helium gas, the detector I is started; when the gas in the gas storage tank is neon gas or argon gas or krypton gas, the detector II is started; part of atoms reflected by the surface of the sample enter the detector, and the obtained data is input into a computer; and relevant information of the surface of the sample is obtained.

The invention discloses a soft diaphragm with an adjustable size and a dimming assembly comprising the soft diaphragm, relates to the technical field of laser processing, and solves the problems of how to suppress a diffraction effect and how to adjust the size of a light spot. The soft diaphragm includes a front cover; a longitudinal sliding rail fixing plate, a soft diaphragm tooth a assembly, an adjusting sliding rail rotating piece and a rear cover are sequentially arranged on the inner side of the front cover and are coaxial with the front cover. According to the invention, through the arrangement of the size-adjustable soft diaphragm, the diffraction problem caused by the use of a small-aperture diaphragm in a laser light path can be effectively inhibited; when the soft diaphragm is applied to a lens combination sliding rail system, the roundness of a laser spot can be improved on the premise of suppressing a diffraction ring; laser can be expanded and shrunk, so that the size and the roundness of a required light spot are flexibly adjusted, and the laser processing quality is improved; and if necessary, circular nearly-flat-topped light can be intercepted and generated through the soft diaphragm, so that different micromachining requirements are met.