55results about How to "Change wavelength" patented technology

The invention provides a novel photoelectric detector with adjustable response spectrum. The novel photoelectric detector is characterized in that the device structure sequentially comprises an insulation substrate, a gate, a first insulation isolation layer, a conductive channel layer, a metal source-drain, a second insulation isolation layer, a plasmon metal nanometer structure, an electro-optical crystal coverage layer and a transparent leading-out electrode from bottom to top. The refractive index of the electro-optical crystal coverage layer is controlled by an externally-applied voltage, so that the refractive index of a coverage substance is changed with the change of the external voltage to further control plasmon resonant wavelength of the metal nanometer structure and response wavelength of the detector. In the detector device structure, the spectrum can be regulated by the voltage, miniaturization and microminiaturization are facilitated, and the novel photoelectric detector has good application prospect in the field of a photoelectric device and optical communication.

The invention relates to the semiconductor laser technology field and especially relates to a laser light source system and a display apparatus. A laser, a heat sink and a uniform light device are included. The laser comprises N laser chips and the N is an integer which is greater than or equal to 1. The N laser chips are arranged on the heat sink. In the heat sink, thermal conductivities of positions where at least two laser chips are located are different so that the laser chips at different positions possess a temperature difference and wavelengths of output light of the laser chips are changed. Laser beams emitted by the N laser chips are entered into the uniform light device. Through the uniform light device, the laser beams with different wavelength are superposed and finally laser beams which are uniformly distributed are acquired so that laser coherence is reduced and laser speckles are effectively restrained. The structure of the laser light source system is simple, cost is low and the system is easy to realize.

The invention discloses a method and a device for realizing wave absorbing of graphene at a visible light waveband, and belongs to the field of photoelectric detection and micro-nano optical, mechanical and electrical systems. A multi-groove structure provided by the invention is a periodic micro-structure, a primitive cell (a basic unit of the structure) of the periodic micro-structure is formedby a plurality of narrow metal grooves with the same width and different depths, a dielectric coating layer is filled into the grooves and above the grooves, and the graphene is deposited above the dielectric coating layer. For TM polar incident light waves, due to a cavity resonance effect of the grooves, the grooves with different depths correspond to different graphene light absorption wavelengths, and broadband absorption of the graphene at the visible light waveband can be realized through combination of the grooves with the different depths. In addition, an absorption spectrum of a waveabsorber is insensitive to the change of an incident angle, and even the incident angle is obviously changed, the graphene still has excellent broadband light absorption performance; and the method and the device have an application prospect in the fields such as light modulators, solar cells, touch screens, biological sensing and the like.

The invention provides a sealing device of a semiconductor laser device, which comprises a vacuum cap and a base, wherein the vacuum cap is formed by a top part and a side wall, a vacuum interface and a plug seat hole are formed at the top part of the vacuum cap, a lower edge extending outwards is arranged at the lower part of the side wall of the vacuum cap, a groove is formed at the lower part of the lower edge, a sealing ring is plugged into the groove, a light output tube extending outwards is arranged on the side wall of the vacuum cap, and a light outlet is formed at the tail end of the light output tube; and the base comprises a base station and a base station edge, and a vacuum cavity is formed by the vacuum cap and the base station in a circling manner. Therefore, the invention ensures that an excellent vacuum cavity with a good sealing performance is formed, condensation on the surface of the surface of the laser tube under a low temperature is prevented, the temperature can be reduced further, and temperature drift can be effectively avoided. The invention further provides a laser device sealed with the sealing device.

The invention discloses a higher-order Stokes light generation device, comprising a confocal unsteady cavity A and a multi-thread pool B. The confocal unsteady cavity A has two high reflection concave cavity mirrors which are positioned symmetrically; a resonant cavity satisfies the condition of the confocal unsteady cavity; base frequency laser and a first stage Stokes light (marked as S1) passes through a scraper mirror A and a ridge mirror and is outputted to a multi-thread pool B; a gas Raman medium is filled in the B, the concave surface cavity mirrors are placed on two side, on which high reflection films reflecting base frequency light, S1 and second stage Stokes light (marked as S2) are plated, and the two concave surface cavity mirrors are sealed with the multi-thread pool through a flange; the laser and the Raman light which enter the multi-thread pool are constantly oscillated and amplified between two cavity mirrors in the multi-thread pool; and the amplified high order Stokes light is outputted from a multi-thread pool output window. The high-order Stokes light generation device can reduce the high order Stokes light generation threshold, improves the Raman conversion efficiency, can change the Raman laser wave length through changing the Raman pool and the Raman active gas in the multi-thread pool, can change the Raman laser length, and can realize the switchable output of the multi-wave-band laser.

The invention discloses a method for generating a frequency modulation signal based on light injection locking. A first laser, a second laser, a first microwave source, a second microwave source, a microwave amplifier, a first coupler, a second coupler, a first polarization controller, a second polarization controller, an isolator, an intensity modulator, a circulator, an acousto-optic frequency shifter and a photoelectric detector are included. The temperature and current parameters of a first laser are adjusted to modulate the first laser, wherein one path modulates an optical signal into asideband through an intensity modulator, and then injects and locks the modulated sideband of the optical signal into a second laser without an isolator, so that the phase of the second laser is locked to a high-order sideband of the first laser; the other path outputs a signal of which the frequency can be linearly changed through an acousto-optic frequency shifter; and then, the two paths of light are coupled by the second coupler, the output end of the second coupler and the photoelectric detector beat frequency to generate a frequency modulation signal with tunable high-frequency broadband, and the frequency modulation signal has the advantages of continuous phase and high stability.

The invention provides a measurement turntable for a bidirectional reflection distribution function (BRDF) of a sample, which belongs to the technical field of measuring of BRDFs. With measurement turntable provided by the invention, the problems of a great volume and high cost of a conventional BRDF measurement turntable are overcome. The measurement turntable comprises a laser, a detector, a field lens, a first plane mirror, a second plane mirror, a light source support, a horizontal rotary table, a detector mounting rack, a field lens mounting rack, a connecting rod, a sample, a sample holder, a pedestal, a first rotating shaft, two end plates and a second rotating shaft, wherein parallel light beams transmitted by the laser are incident to the second plane mirror after reflection by the first plane mirror, reflected light beams of the second plane mirror are incident to the upper surface of the sample, reflected light beams of the sample are incident to a light receiving surface of the detector after convergence by the field lens, and the detector is located at the focus of the field lens. The measurement turntable provided by the invention is applicable to measurement of the BRDF of the sample.

The invention discloses a cross-polarization output laser which comprises a pumping source, a pumping coupling system, a resonant cavity reflector, a first laser gain medium, a second laser gain medium, a laser output mirror and a wave wafer which are arranged in sequence. The first laser gain medium and the second laser gain medium are birefringent laser crystals of the same kind and capable of generating the linearly polarized laser, and the light transmission directions of the first laser gain medium and the second laser gain medium are the same in a crystal axis coordinate system but not the crystal optical axis direction. The second laser gain medium is placed by rotating by 90 degrees relative to the first laser gain medium by taking the light transmission direction as an axis. Sincethe polarization directions of the linearly polarized lasers generated by the first laser gain medium and the second laser gain medium are perpendicular to each other, the laser outputs two beams oflasers which have the same wavelength and are orthogonally linearly polarized.

The invention discloses a chip and an apparatus for high-flux testing gas-phase photoelectric properties of a semiconductor. The chip comprises an alumina ceramic substrate which is disposed at the bottom of the chip, electrode arrays and electrode pins which are respectively printed on a surface and two sides of the substrate by a screen printing method, and semiconductor photoelectric materials which are printed on each electrode through an ink-jet printing method or the screen printing method. The apparatus comprises a closed testing cavity and an LED light source. A lug boss for placing the chip is mounted on a base plate, and reeds are in a compression-type contact with the electrode pins of the chip. An integrated level of the electrode arrays on the chip can be changed according to different requirements, and has strong expansibility. Various testing conditions of the apparatus, such as wavelengths of the light source, intensity of the light source, atmosphere, humidity, bias voltage, and the like, can be changed conveniently, so that abundant testing results can be obtained and perfect databases can be established. Moreover, the apparatus is simple in structure and small in size, and has good reliability. The chip and the apparatus have important applications in the fields of room temperature gas-sensitive sensors, optical detections, photocatalysis, etc.

The invention relates to an optical fiber hydrogen sensor based on a core / shell nano periodic linear array plasma metamaterial. The sensor comprises an optical fiber and a gold core / palladium shell nanowire array patterned on an end surface of the optical fiber. The preparation method comprises steps that gold and aluminum are deposited on the end surface of the optical fiber, a porous aluminum oxide structure is formed through the anodic oxidation process, the diameter of a hole is corroded and enlarged, gold is filled, a gold nanowire is formed, an aluminum oxide gold nanowire composite filmis formed by the gold nanowire and the aluminum oxide structure, and palladium is plated around the gold nanowire or on an end surface of the gold nanowire to form a gold-palladium composite structure; a layer of periodically ordered polystyrene nano microsphere film is transferred on a surface of the palladium-plated aluminum oxide gold nanowire composite film, the gold-palladium composite nanowire structure which is not masked by the polystyrene nano microspheres is removed through ion etching, and the polystyrene nano microspheres are removed, and lastly, the alumina matrix is removed. Themethod is advantaged in that an optical fiber sensor is manufactured through the electrochemical technology, the method is simple and low in cost, and the optical fiber sensor has high sensitivity and high safety.

The invention relates to the technical field of organic light emitting display, particularly relates to an OLED device and a manufacturing method thereof, and a display apparatus. The OLED device comprises a positive electrode, a negative electrode and at least two organic light emitting layers arranged between the positive electrode and the negative electrode; a charge generation layer is arranged between two adjacent organic light emitting layers; and a micro structure is arranged on at least one of the two surfaces, adjacent to the two organic light emitting layers, of the charge generationlayer. By virtue of the scheme provided by the invention, the contact area between the charge generation layer and an adjacent functional layer is enlarged, and the effective areas of the generated charges and injected charges of the charge generation layer are enlarged, so that charge generation and transmission capability of the charge generation layer is further improved, and the working voltage of the device is lowered effectively.

The invention belongs to the technical field of tunable lasers, and particularly relates to a wide tuning range dye doping cholesteric liquid crystal laser and a preparation method thereof. The wide tuning range dye doping cholesteric liquid crystal laser comprises an upper glass substrate 1, a circular ring indium tin oxide conductive thin film 2, a cholesteric liquid crystal 3, a laser dye 4, a spacer 5, a disk-shaped indium tin oxide conductive thin film 6 and a lower glass substrate 7. The wide tuning range dye doping cholesteric liquid crystal laser is characterized in that the upper glass substrate and the lower glass substrate are vertically opposite. By the aid of a coaxial disk-circular ring electrode structure, structural parameters such as the thickness of a box, the size of an electrode and the dye doping cholesteric liquid crystal are optimized to obtain a tunable liquid crystal laser structure with a simple manufacturing process and a wide tuning range, and electric field tuning characteristics are effectively realized.

The invention discloses a laser-assisted glow discharge ionization device which comprises a laser light source, a mass spectrometer, a closed ionization cavity and an ionization body. The ionization body comprises a copper column fixing base which contains a hollow copper column and a sample fixing base which contains a sample, the hollow copper column is connected to the ground potential through a wire and an ionization cavity bottom plate, and the sample is connected with a glow discharging power supply. The copper column fixing base and the sample fixing base are arranged oppositely, a laser hole is formed in the side, opposite to the sample, of the hollow copper column, and an ionization area is formed in the laser hole. Lasers emitted from the laser light source penetrate through the hollow copper column and then vertically radiate to the sample. A repeller plate which is used for feeding ions in the ionization area into the mass spectrometer is arranged on one side of the ionization area, and the repeller plate is connected with a DC high-voltage power supply. According to the laser-assisted glow discharge ionization device, glow discharge voltage signals and the ground potential are introduced through the structure, DC high voltages are introduced through the repeller plate to introduce ions generated by discharging into the mass spectrometer, the ion transmission efficiency is improved, and the detecting sensitivity is high.

The invention discloses a random fiber laser based on stimulated Raman effect and belongs to the technical field of fiber lasers. The random fiber laser comprises a first fiber Bragg grating, a first random phase shifting fiber Bragg grating, a Raman pumping laser source, a wavelength division multiplexer, a single mode fiber, a second random phase shifting fiber Bragg grating and a second fiber Bragg grating. The common fiber Bragg gratings are used for reflecting pumping light, the random phase shifting fiber Bragg gratings provide random light feedback, and laser threshold power can be effectively lowered. The stimulated Raman effect is used for achieving light gain, Random pumping light wavelength and fiber Bragg grating center lengths can be changed, and random laser output with different wavelengths is obtained. The laser has the advantages of being simple in structure, easy to manufacture, low in threshold power and the like.

The invention discloses an adjustable small-wavelength interval optical transceiver, which comprises a laser emitter, an isolator, a comb filter, a single-mode optical fiber adapter and a laser receiver, wherein the laser emitter, the isolator, the comb filter and the single-mode optical fiber adapter are arranged on the same level; the isolator is arranged between the laser emitter and the comb filter; the single-mode optical fiber adapter is installed on one end, which is far away from the laser emitter, of the comb filter; and the laser receiver is arranged on the side of the comb filter. The PLC (Programmable Logic Controller) comb filter is used for replacing a traditional space light comb filter, temperature in the laser emitter is changed so as to change the wavelength of the laser,so that the laser emitter is cooperated with the comb filter to finish double-channel multiplexing, the light of a transmitting terminal successfully passes through the filter to enter the single-mode optical fiber, a received optical signal is prevented from entering the light transmitting terminal, meanwhile, a situation that the optical signal of the local transmitting terminal directly entersa local receiving terminal to cause a light crosstalk problem is avoided, and a purpose of simplifying a technology and lowering cost is realized.

The invention discloses intelligent glass, and the intelligent glass comprises a glass plate and an anti-eavesdropping film layer, wherein the anti-eavesdropping film layer is arranged on the glass plate, and the anti-eavesdropping film layer is used for receiving and absorbing eavesdropping electromagnetic waves and / or generating new electromagnetic waves after receiving the eavesdropping electromagnetic waves. According to the embodiment of the invention, the anti-eavesdropping film is arranged on the glass plate, so when eavesdropping electromagnetic waves are incident on the glass plate, the eavesdropping electromagnetic waves can be absorbed by the anti-eavesdropping film layer, and / or under the action of the eavesdropping electromagnetic waves, the new electromagnetic waves are generated and emitted out to cause damage to the eavesdropping information, so that the regulator cannot analyze the accurate eavesdropping information to cause an eavesdropping failure, thereby improvingthe anti-eavesdropping efficiency, and reducing the anti-eavesdropping configuration cost.

The invention discloses a miniaturized dual-band circularly polarized antenna for loading electromagnetic meta-material. A radiation layer at a first radiation layer, an electromagnetic meta-material layer at a second layer, and a floor layer at a third layer commonly form a radiant panel of an antenna, wherein the electromagnetic meta-material layer at the second layer changes the relative dielectric constant and the relative permeability of this layer, so that the wavelength of the radiation electromagnetic wave in the meta-material medium is reduced, the antenna size is favorably reduced, the impedance characteristic is changed, and the bandwidth is favorably broadened; furthermore, the adding of a pentahedral metal back cavity can effectively shield the backward radiation and the external disturbance, and the directed radiation directivity requirement of the antenna is enhanced; the entire antenna is free from adding any matching network, the size of the antenna is only 60mm, and the relative bandwidth is 11.7%; the miniaturized dual-band circularly polarized antenna disclosed by the invention has the features of being double in bands, high in gain, miniaturized, good in directed radiation, and simple in feeding mode, and capable of satisfying the detection requirement of a missile-borne antenna; and meanwhile, the portable design requirement can be satisfied, the miniaturized dual-band circularly polarized antenna can be applied to other fields but not limited on the missile aircraft.

The invention discloses an industrial natural gas synergist. The industrial natural gas synergist is prepared by the following steps: sequentially adding the following chemical raw materials into a tank in parts by weight: 8-9 parts of di-tert-butyl peroxide butane, 7-8 parts of menthane hydroperoxide, 3-5 parts of cyclohexane peroxide, 1 part of isooctyl nitrate and 3-4 parts of C5-C9 straight-chain paraffins, slowly stirring the raw materials for 15 to 25 minutes, standing for 8 to 15 minutes, and then, putting the mixture in a wrappage to obtain a finished product. The industrial natural gas synergist is used with natural gas according to a ratio of synergist to natural gas of (1-3): 10 in parts by weight. The industrial natural gas synergist disclosed by the invention can regulate the combustion speed in the combustion process of natural gas and can remove smoke. In an oxygen-fuel combustion process, the flame temperature is higher than 3200 DEG C. The industrial natural gas synergist has good intermiscibility with natural gas and has good evaporability while having no residue or precipitation.

A forming method for dynamic grating fringe provides base materials with polishing surface located with multiple reflection areas. Then it is to provide a laser and to let laser shoot on the reflection areas of base materials and forms a grating fringe after intervention.

The invention discloses a gravity type fiber bragg grating tilt angle sensor, which comprises a circular ring-shaped main body, the inner wall of the main body is rotatably connected with a vertical block with a low gravity center, two connecting screws for keeping the vertical block stable are arranged in the vertical block, a hollow bearing mechanism is arranged at the bottom of the inner wall of the main body, and the hollow bearing mechanism is connected with the vertical block. An optical fiber tube is arranged at the hollow position of the bearing mechanism, the interior of the optical fiber tube is connected with an optical fiber, and the optical fiber makes contact with the outer wall of the plumb block. The main body is installed on a measured beam column, after the beam column inclines, the main body inclines along with the inclination of the beam column, the center of the vertical block is low, so that the angle between the vertical block and the ground is kept unchanged, and the optical fiber tube which is originally collinear with the axis of the vertical block forms an angle with the axis. Therefore, the component force of the plumb block on the optical fiber in the optical fiber tube is changed, and the wavelength change of the optical fiber can be measured through the change of the component force, thereby measuring the changed angle of the beam column.

The present invention provides a lamp with a replaceable ornament. The lamp comprises a base, a light emitting module disposed on the base, a lens unit covering the light emitting module, and an ornament unit arranged in front of the lens unit in a replaceable manner. The lens unit comprises a lens body around a through hole, and the lens body has an incoming light face pointing to the light emitting module and a hollow front end face. Light emitted by the light emitting module enters into the lens body, exits from the front end face of the lens body and penetrates through the ornament unit. The ornament unit has an ornament function and can change the color, wavelength, angle or light field of the light emitted from the front end face.

The invention discloses a transmitting and receiving wavelength matching method for a laser radar. A narrow-linewidth pulse laser, an optical transmitting system, a beam splitter prism, a reflector, areflective volume Bragg grating, an optical receiving system, a volume grating rotation control module, a photodiode, a photodiode rotation control module, a signal acquisition module, a signal processing module and a detector are included. The method can achieve the matching of the central wavelengths of the transmitting system and the receiving system of the laser radar. Bragg diffraction anglecharacteristics of the two surfaces of the volume Bragg grating are respectively utilized, and the reference light after beam splitting and the signal light received by the receiving system respectively enter the two surfaces, so that Bragg diffraction occurs simultaneously at the same angle, and the effect of matching the central wavelengths of a transmitted signal and a received signal is achieved. The method is particularly suitable for a laser radar system which works for a long time or uses a tunable laser.

The invention relates to a method for generating a coherent pulse radar signal based on a sweep-frequency optoelectronic oscillator, and the method comprises the steps: S1, enabling an output signal emitted by a laser to enter a Mach-Zehnder modulator, and generating a first signal; S2, injecting the first signal into a single-mode fiber through a microwave photon filtering device; S3, enabling the first signal delayed by the single-mode optical fiber to enter a photoelectric detector for beat frequency to form a second signal; S4, enabling the second signal to enter an electric amplifier to form a third signal, and enabling the third signal to enter a radio frequency input port of an electro-optical modulator to form a closed loop; in the step S1, the digital frequency synthesizer generates a first control signal and a second control signal, and the working point of the Mach-Zehnder modulator is controlled to repeatedly and transversely jump at the maximum bias point and the minimum bias point. By changing the initial phase difference of the pulse driving signal and the triangular wave signal or the wavelength of the laser, fine and large-range tuning of the center frequency of the generated broadband signal is realized.

The invention is a high-order Stokes light generating device, which includes two parts: a confocal unstable cavity A and a multi-pass pool B; wherein the confocal unstable cavity A has two symmetrically placed high anti-concave mirrors, resonant The cavity satisfies the confocal unstable cavity condition; the fundamental frequency laser and the first-order Stokes light (denoted as S1) are output from A to the multi-pass cell B through the scraper mirror and the roof mirror; B is filled with a gaseous Raman medium, A concave cavity mirror coated with a high reflection film for the fundamental frequency light and S1 and secondary Stokes light (denoted as S2) is placed on both sides, and is sealed with the multi-pass cell through the flange; the laser and the multi-pass cell entering the multi-pass cell The Raman light continuously oscillates and amplifies between the two cavity mirrors in the multi-pass cell, and the amplified high-order Stokes light is output from the output window of the multi-pass cell. The invention can reduce the generation threshold of high-order Stokes light, and improve the Raman conversion efficiency; by changing the Raman active gas in the Raman pool and the multi-pass pool, the wavelength of the Raman laser can be changed, and the multi-band laser can be switched output.

The invention relates to the technical field of agricultural chemical packaging, and discloses a molecular motion inhibition device for agricultural chemical packaging. The molecular motion inhibitiondevice for agricultural chemical packaging comprises a shell, wherein the interior of the shell is fixedly connected with an inflow port, the surface of the inflow port is hinged with bearing plates,the bottom of the inflow port is movably connected with baffles, and the surfaces of the baffles are fixedly connected with compression springs; elastic rods are movably connected with the surfaces of the baffles and located below the compression springs; the surface of each elastic rod is in sliding connection with a sliding groove; and when agricultural chemicals flow into the shell, the bearing plates can be extruded to slide on the surfaces of the inner walls of the shell due to the fact that the agricultural chemicals have certain weight, piston rods in the inner walls of the shell are extruded to move downwards, gas is extruded to flow into the sliding grooves, gas blocking blocks in the sliding grooves are pushed by the gas to extrude the elastic rods, the elastic rods extend out of the sliding grooves and push the baffles to move under the clamping of the compression springs, and due to the fact that the elastic rods are symmetrically arranged, the baffles of the sliding grooves are close to each other, the flowing area of the inflow port can be reduced, and thus the effect of reducing the flowing speed of the agricultural chemicals is achieved.

The invention discloses a variable-mode magnetic concentrator-type Lamb wave electromagnetic acoustic transducer, which comprises a neodymium-iron-boron magnet, a class A magnetic concentrator, a class B magnetic concentrator, and a flexible circuit board. Double layer variable pitch return coil. Place the coil on the surface of the aluminum plate, and the upper surface of the magnetic concentrator and the NdFeB magnet are attracted and fixed directly above the coil. When a class A magnetic concentrator is selected, the lower surface of the magnetic concentrator is controlled to be placed on the center of the coil with a distance of d 1 On the coil, the main mode that can be excited is A 0 Modal guided wave; when the class B magnetic concentrator is selected, the lower surface of the control magnetic concentrator is placed on the center of the coil with a distance of d 2 On the coil, the excitable main mode is S 0 Modal guided waves. Through the frequency characteristic test, it is verified that the developed variable-mode magnetic concentrator Lamb wave electromagnetic acoustic transducer has good frequency response characteristics, and at the same time, the rationality of the transducer design is verified, and the structural health of the plate structure is realized. monitor.

The invention discloses a colored layered structure and a control method for changing the color of the colored layered structure. The colored layered structure comprises a base layer, a color layer and a reflective layer, the color layer is made of metalloid and has a thickness to be superposed with the base layer, and the reflective layer is superposed with the base layer and the color layer to form the layered structure; and visible light passes through the thickness of the color layer and is reflected on the color layer by the reflective layer, so that the color is presented. The wavelengthof the visible light can be changed by controlling the thickness of the color layer, so that the presented color is controlled. The color is presented through passing and reflecting of the visible light.

The present invention interconnects polymer or luminescent organic compound material via crosslinking and forms interacting crosslinking bond, crossslinking segment, coordinate bond or hydrogen bond among molecules. The prepared luminescent material has stereo structure, planar structure and other structural form, and this raises or alters the luminescence efficiency, luminescence bright, luminescence life, luminescent device stability, luminescence wavelength, color purity, and luminescent device performance.