75 results about "Quasi-crystals" patented technology

A device and method for detecting the deuterium doping concentration of a deuterium-doped KDP crystal are disclosed. The device comprises a fundamental frequency laser, a second-harmonic deuterium-doped KDP crystal arranged sequentially along the laser output direction of the fundamental frequency laser, a frequency doubling adjuster acting on the second-harmonic deuterium-doped KDP crystal, a first second-harmonic laser color separator, a second second-harmonic laser color separator, and an energy meter. The angle at which two fundamental frequency beams of different wavelengths output from the fundamental frequency laser are incident on the second-harmonic deuterium-doped KDP crystal is controlled by the frequency doubling adjuster. Based on the reading of the energy meter, the second-harmonic deuterium-doped KDP crystal is adjusted to a position corresponding to the phase matching angle. The deuterium doping concentration of the second-harmonic deuterium-doped KDP crystal is obtained by comparing the difference in the measured phase matching angles of the two laser beams with the difference in the phase matching angle calculated according to an empirical formula and the relationship between the phase matching angle difference and the deuterium doping concentration of the crystal. This invention has the advantages of stable device and simple and accurate detection method.

This invention proposes a multi-target detection method based on entangled photons. First, a pump light is generated using a continuous narrow-linewidth semiconductor laser, which, after polarization modulation and focusing, illuminates a PPKTP crystal. A spontaneous parametric down-conversion process generates polarization-entangled photon pairs, which are then separated into signal and reference light. These are received by a single-photon detector to obtain two time series. Second, coincidence measurements are performed on the time series in different scanning directions within the observation area to obtain a coincidence count matrix. Then, a two-dimensional constant false alarm rate (CFAR) detection algorithm is introduced, using ordered statistics to estimate background noise and adaptively adjust the detection threshold to screen candidate target points. Third, a density clustering algorithm based on correlation strength weighting is employed, combining the correlation strength and spatial distribution of entangled photon pairs to detect different targets and suppress isolated noise. Finally, the coincidence count peak points within each target cluster are selected as the final detection targets, thereby achieving multi-target detection with unknown numbers and randomly distributed locations.

This invention provides a device and method for generating simultaneously emitted three wavelengths of laser light with equal spacing, relating to the field of laser technology. The device includes a pump source, a half-wave plate, an optical isolator, a focusing lens, an input mirror, a Raman crystal, an output mirror, a nonlinear crystal, and a dichroic mirror arranged sequentially along the optical path. The pump light, after its polarization direction is adjusted by the half-wave plate and the optical isolator, is focused onto the Raman crystal. Stimulated Raman scattering generates first and second Stokes beams, which are then converted to sum-frequency light by the sum-frequency effect of the nonlinear crystal. Finally, the dichroic mirror outputs three equally spaced wavelengths of laser light. This invention separates the Raman conversion and sum-frequency processes through an external cavity structure, achieving for the first time the simultaneous emission of three equally spaced wavelengths of laser light, offering advantages such as high output energy, equal wavelength spacing, and simultaneous emission of three wavelengths.

This invention provides a method, system, and storage medium for rapid oscillation start-up of an overtone crystal. The method involves acquiring an oscillation signal as excitation parameter information and comparing it with a preset first threshold group. If any parameter fails to meet the requirements, a pre-adjustment of the oscillation signal is performed until all parameters meet the requirements, triggering a first conversion command. In response to this command, based on the comparison result of the slope deviation of the rising slope within adjacent detection cycles with a second threshold, the pulse intensity is increased or the pulse interval is shortened to strengthen the excitation when the deviation exceeds the standard. When the deviation meets the standard, a second conversion command is output and phase noise is extracted. The phase noise is compared with a third threshold. If the phase noise does not meet the standard, the excitation voltage is slightly increased to suppress the noise. When the phase noise meets the standard, the excitation voltage is gradually decreased until the phase noise recovers, at which point an oscillation start-up completion command is output. This achieves rapid oscillation start-up of the overtone crystal while ensuring the frequency stability and steady-state power consumption of the oscillation signal.

This invention provides a high-recovery heme iron extraction method and apparatus using enzymatic hydrolysis-multi-stage centrifugal coupling, relating to the fields of biopharmaceuticals and fluid dynamics processing technology. The method first constructs a polyanionic electrolyte shielding system, utilizing electrostatic potential energy to induce conformational instability of globin and pre-exposure of hydrophobic cavities, reducing binding energy at the molecular level and solving the problem of heme's encapsulation resistance in high-concentration systems. Then, high-shear coupled enzymatic hydrolysis is performed within a micron-sized liquid film generated by a hypergravity field, utilizing the instantaneous synergy of mechanical shear stress and enzymatic degradation to achieve directional exfoliation of heme, eliminating secondary re-adhesion effects. Finally, directional phase transition regulation is performed based on density gradient drive, and a high-frequency pulsed pressure field is introduced for in-situ exchange washing, distinguishing and retaining impurities and crystal cores, outputting a high-purity, flavor-neutral heme iron product. This invention effectively improves the controllability of the extraction process and the stability of industrial continuous production.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

This application discloses a temperature control method and related apparatus. First, it acquires the current operating data of the crystal furnace. Then, based on the current operating data and a first prediction model, it determines the timing for shutting down the low-level heater. Furthermore, by predicting the timing for shutting down the bottom heater, it controls the bottom heater, resulting in better temperature control. Next, based on the current operating data, a second prediction model predicts the first time interval for the solution percentage in the crystal furnace to reach a second preset threshold. Then, based on the first time interval and the current operating data, the prediction model predicts the power correction amount for the main heater. Finally, based on the power correction amount, it controls the main heater to ensure consistent liquid temperature after temperature control. Therefore, it achieves better consistency in liquid temperature after temperature control, realizes standardized temperature control of the crystal furnace, and improves the accuracy of temperature control.

A crystal resonator is configured to be coupled to a start-up circuit, the start-up circuit comprising an H-bridge circuit having a number of switches. A number of switch control signals are generated in response to detecting a zero-crossing event of a motional current in the crystal resonator. The switches of the H-bridge circuit are controlled by the switch control signals to apply a voltage to the terminals of the crystal resonator with a first polarity during a first switch control phase and with a second, opposite polarity during a second switch control phase. During a respective first sub-phase of the respective switch control phase, the number of switches are configured in a first configuration to couple a power supply node to the respective crystal resonator terminal. During a respective second sub-phase of the respective switch control phase, the number of switches are configured in a second configuration to couple the power supply node to the respective crystal resonator terminal. In the second configuration, a resistance between the power supply node and the respective crystal resonator terminal is greater than in the first configuration. A zero-crossing is detected during each respective second sub-phase.

The application discloses a kind of heating and heat dissipation bidirectional personal thermal management fabric and preparation method thereof, belong to thermal management fabric design technical field.The main surface of fabric is sprayed with a layer of amorphous structure photonic crystal coating, the reflectivity of fabric in visible light near infrared band and the emissivity in mid-infrared band are improved, the physical coloring of no thermal burden is realized on the surface of fabric to meet the demand of diversification and beauty of textile, the MXene nanosheet of low emissivity is sprayed on the other side of fabric, the passive radiation heating performance, photothermal conversion performance and joule heating performance of MXene are used to realize the heating thermal management of fabric, the fabric of the application realizes dynamic personal thermal management, that is, compared with the temperature of simulated human skin, the temperature can be reduced by 10.2 DEG C in summer, and the temperature can be increased by 21.4 DEG C in winter by combining the heating effect of multiple modes, to provide greater flexibility for personal thermal management under different environmental conditions.

The application discloses a 750-850nm waveband photonic crystal surface emitting laser and a preparation method, and belongs to the field of semiconductor lasers. The application is divided into surface etching and buried photonic crystal layer structures, uses n-GaAs as a substrate, combines surface etching or buried photonic crystal structures, uses amorphous silicon, titanium oxide, GaP or AlGaAs as main materials of a resonant cavity, utilizes large-area in-plane resonance and high coupling with a quantum well active layer, realizes low-loss resonance and optical gain, and realizes a 750-850nm waveband semiconductor laser with high light beam quality, high power and surface emission.

The application relates to the technical field of wastewater treatment, in particular to a system and method for increasing the sodium sulfate crystallization particle size of coal chemical wastewater. The system comprises an evaporator, a crystallizer connected to the downstream of the evaporator, a heat exchanger in closed loop communication with the crystallizer, a thickener, the upper part of which is in closed loop communication with the crystallizer, the thickener is internally provided with a stirrer, and a centrifugal dewatering machine connected to the bottom of the thickener. After the high-concentration brine is treated by the crystallizer, crystal slurry is obtained, when the concentration of the crystal slurry reaches a predetermined concentration, the crystal slurry is sent into the thickener, the stirrer in the thickener can prolong the residence time of the crystal slurry in the thickener, so as to increase the crystal particle size of the crystallization in the thickener. Compared with the wastewater treatment mode in the background art, in the same time, solid salt with larger particle size can be obtained, and a larger crystallizer and a circulating system are not needed, so that the feeding and equipment operation become more difficult.

The application discloses a kind of ultrafast pulse laser autocorrelation measurement system and method, comprising: beam splitting unit;Reference light path;Delay light path;Adjustable delay unit;Delay light mirror group;Reference light mirror group;Combining unit;Focusing unit;Asymmetric air nanoslit photodetector, for receiving the light beam output by combining unit and focusing unit, and output corresponding photocurrent signal;Signal acquisition and processing unit, for acquiring photocurrent signal, and obtaining the intensity autocorrelation curve of ultrafast pulse laser according to the time delay change relationship of photocurrent signal, and inversion obtains the pulse width information of ultrafast pulse laser.The application utilizes asymmetric air nanoslit photodetector to directly output photocurrent signal, realizes the autocorrelation measurement of ultrafast pulse laser, without nonlinear crystal, compact structure, easy to integrate, suitable for measuring femtosecond or picosecond ultrafast pulse laser.

The application provides a composite piezoelectric structure, comprising a supporting substrate and a composite piezoelectric layer, the composite piezoelectric layer is located on one side surface of the supporting substrate, and comprises at least two piezoelectric film layers, the at least two piezoelectric film layers have the same crystal cutting type, and a preset included angle is formed between the same in-plane crystal axes of the two adjacent piezoelectric film layers. In the composite piezoelectric structure provided by the application, the at least two piezoelectric film layers have the same crystal cutting type, so that the thermal expansion coefficient matching degree of each piezoelectric film layer is high, the internal stress caused by thermal mismatch can be significantly reduced, and the structural integrity and service life are improved; by setting the preset included angle between the same in-plane crystal axes of the two adjacent piezoelectric film layers, the thermal expansion directions of the two adjacent piezoelectric film layers can be offset to each other, a complementary structure is formed, the composite piezoelectric layer tends to be isotropic, and the thermal stress between the composite piezoelectric layer and the supporting substrate can be reduced.

This invention discloses a high-power, broadband, tunable long-wavelength mid-infrared femtosecond laser generation device and method. The laser beam is split into a first beam and a second beam. The first beam pumps a first YAG crystal to generate a first supercontinuum, from which a signal light of a predetermined wavelength is selected. The signal light undergoes at least two cascaded optical parametric amplification stages to generate a high-power mid-infrared pump light. The second beam pumps a second YAG crystal to generate a second supercontinuum covering the long-wavelength infrared band as a seed light. This seed light is then incident on a BGGSe crystal for optical parametric amplification. Using a 1.5μm high-power femtosecond laser as the pump source, combined with the BGGSe nonlinear crystal for optical parametric amplification, the wide transmission range and high nonlinear coefficient of the BGGSe crystal are effectively utilized. Phase matching in the 6–18μm band can be achieved under 1.5μm pumping conditions, thereby obtaining a broadband, high-power, femtosecond-level laser output covering the long-wavelength mid-infrared band.

The application belongs to the technical field of laser, and proposes a pulse laser delay device and method based on polarization state adjustment, which comprises a light splitting device composed of a coaxially arranged Faraday isolator and a half-wave plate, and a delay device composed of two mirrors, an electro-optic crystal and a 45° polarizer, wherein one of the mirrors is connected with a one-dimensional displacement table. After the laser is changed into s light by the light splitting device, the s light is reflected by the polarizer into the electro-optic crystal, and when a quarter-wave voltage is applied by the electro-optic drive, the s light is converted into p light to enter the resonant cavity. After the voltage is removed, the laser is reflected between the two mirrors for multiple times to realize delay. After the voltage is applied again, the laser is changed back into s light, which is reflected by the polarizer and escapes from the hole of the Faraday isolator to be output. Through the fine adjustment of the optical path by the displacement table and the control of the electric signal, the fine continuous adjustment of the delay of ns to μs level can be realized, and the long delay adjustment of high-power pulse laser is suitable.

The application belongs to the technical field of deep ultraviolet laser, and provides a continuous deep ultraviolet laser and a working method for realizing walk-off elimination and aberration correction, which comprises a fundamental laser for outputting continuous single-frequency laser in a visible waveband and serving as an input light source for nonlinear conversion; a resonant frequency-doubling cavity which is a bow-tie type ring cavity and is composed of four mirrors; a temperature controller which is placed in the resonant frequency-doubling cavity and is located between a high-reflectivity curved mirror and a bichromatic aberration-corrected collimating output mirror, and is used for controlling the nonlinear crystal to work at an optimal temperature to realize maximum harmonic output of the nonlinear crystal; and a nonlinear crystal which is placed in the temperature controller and is used for outputting the generated frequency-doubled light from the bichromatic aberration-corrected collimating output mirror, and the fundamental light is reflected back to the coupling input mirror for resonant enhancement; wherein the positions of the four mirrors are set according to the resonant cavity stability conditions, so that the spot radii in the meridional direction and the sagittal direction are equal at the center of the nonlinear crystal. High-quality deep ultraviolet laser output is realized.

This utility model relates to the technical field of electro-cleaning devices for crystal resonators, and discloses an electro-cleaning device for crystal resonators, including a cleaning tank. The cleaning tank has an electro-cleaning pool and a rinsing pool inside. A support is fixedly installed on the upper surface of the cleaning tank, and a moving mechanism is fixedly installed on the inner top of the support. A cleaning basket is attached to the hook end of the moving mechanism. A stirring mechanism is installed on the outer surface of the cleaning tank, and the stirring end of the stirring mechanism extends into the interior of the electro-cleaning pool and the rinsing pool. A fixing plate is fixedly installed on one side of the support, and a drying mechanism is installed inside the fixing plate. This utility model, through the setting of the stirring mechanism, ensures that all parts of the crystal resonator can come into contact with the cleaning solution and rinsing solution, thereby improving the cleaning effect.

Sensor system with a multi-pass interaction region, the system comprising: a waveguide (201) comprising: an input region (202, 302, 402) configured to receive emitted light; a multi-pass region (204, 304, 404) coupled to the input region (202, 302, 402), which is configured as a photonic crystal to absorb portions of the emitted light according to a sample (212) located immediately adjacent to the multi-pass region (204, 304, 404); and an output region (206, 306) coupled to the multi-pass region (204, 304, 404), which is configured to provide interacted light from the multi-pass region (204, 304, 404); and a flexible membrane (214) on which the input region (202, 302, 402), the multi-pass interaction region (204, 304, 404) and the output region (206, 306) are formed, wherein the flexible membrane (214) has a honeycomb structure on its back side in relation to the waveguide (201).

The application discloses a stylus and a smart device, and relates to the touch control technical field.The stylus comprises a pen body, a pen head, a crystal structure member and a vibration excitation module.The pen head is installed at one end of the pen body, the crystal structure member is installed in the pen head, and the vibration excitation module is arranged towards the crystal structure member to output an alternating physical excitation field to the crystal structure member to drive the crystal structure member to vibrate.The technical scheme provided by the application drives the crystal structure member to vibrate by arranging the crystal structure member in the pen head and cooperating with the vibration excitation module, so that the energy generated by the vibration of the crystal structure member can consume the kinetic energy of the pen head when sliding on the touch screen, thereby increasing the contact and sliding damping between the pen head and the touch screen.Meanwhile, the vibration of the crystal structure member can provide delicate vibration touch feedback for the user, and effectively optimizes the damping feeling when the pen head contacts the touch screen.

The application relates to the technical field of wireless communication, and provides a surface acoustic wave device, which comprises a supporting substrate, a piezoelectric substrate and an interdigital transducer; the supporting substrate is made of sapphire material; the interdigital transducer comprises first interdigital electrodes, second interdigital electrodes, and oppositely arranged first bus bars and second bus bars; the first interdigital electrodes are spaced from the second interdigital electrodes and the second bus bars, and the first interdigital electrodes and the second interdigital electrodes are opposite in polarity; the arrangement direction of the first interdigital electrodes and the second interdigital electrodes is the sound wave propagation direction; wherein the sapphire is r-surface sapphire, the crystal arrangement of the r-surface sapphire is in the shape of a regular hexagonal prism, the growth axis of the r-surface sapphire is perpendicular to the bottom surface thereof, and the [2-1-1] crystal direction of the r-surface sapphire is perpendicular to the normal projection of the growth axis on the r-surface and parallel to the sound wave propagation direction. The surface acoustic wave device can realize higher frequency, higher reliability and higher power.

The utility model discloses a kind of crystallizing tank devices of automation precision temperature control, it is related to crystallizing tank technical field, specifically a kind of crystallizing tank devices of automation precision temperature control, including crystallizing tank main body, further include filter component;By setting first collecting hopper, cylinder, second collecting hopper and spiral conveying rod and the structure such as etc., the efficient filtration to impurity in crystallization is realized.Crystalline is conveyed to right side under the driving of spiral conveying rod, falls down impurity through filter screen in the process, while fixed rod on spiral conveying rod further drives crystalline to turn over, improve filtering effect.In addition, cylinder can slide left and right under the driving of second motor, further enhance the turning effect of crystal, make impurity more fully contact with filter screen, to realize more thorough filtration.Compared with prior art, the filtering efficiency of the utility model is significantly improved, can effectively remove impurity in crystallization, improve the purity of product, satisfy the demand of high-purity product production.

The utility model relates to the technical field of laser, specifically relates to split beam amplification quasi-continuous fiber laser, including light ware body and the transmitter body connected in laser ware body one end, the other end of transmitter body is provided with the emission head, the splitter is set up in the inside one side of transmitter body to be connected with the output end of laser ware body, a plurality of light path amplification channels are connected with the output end of splitter in one end, the beam combiner is connected with a plurality of light path amplification channels in one end, and the other end of beam combiner is connected with the emission head. Compared with the prior art, the nonlinear crystal of lithium niobate material introduced along the inner wall of the optical fiber in the light path amplification channel and the phase modulator arranged on one side of the beam combiner, the stability and controllability of the system are improved, the phase modulator is matched with the lithium niobate crystal, the integration of phase modulation and frequency conversion can be realized, and especially for the system needing to control phase and frequency simultaneously.

This invention discloses a high-power, broadband, tunable long-wavelength mid-infrared femtosecond laser generation device and method. The laser beam is split into a first beam and a second beam. The first beam pumps a first YAG crystal to generate a first supercontinuum, from which a signal light of a predetermined wavelength is selected. The signal light undergoes at least two cascaded optical parametric amplification stages to generate a high-power mid-infrared pump light. The second beam pumps a second YAG crystal to generate a second supercontinuum covering the long-wavelength infrared band as a seed light. This seed light is then incident on a BGGSe crystal for optical parametric amplification. Using a 1.5μm high-power femtosecond laser as the pump source, combined with the BGGSe nonlinear crystal for optical parametric amplification, the wide transmission range and high nonlinear coefficient of the BGGSe crystal are effectively utilized. Phase matching in the 6–18μm band can be achieved under 1.5μm pumping conditions, thereby obtaining a broadband, high-power, femtosecond-level laser output covering the long-wavelength mid-infrared band.

Embodiments of the present disclosure disclose a medical laser suitable for microsurgery. A specific embodiment of the medical laser comprises a mirror, a gain crystal, a prism group, a Q switch and an output coupling mirror. The mirror is located at the starting point of the outgoing laser, and the gain crystal is arranged behind the mirror. The outgoing laser enters the prism group comprising a first prism, a second prism and a translation assembly from the gain crystal. The first prism is installed on the translation assembly and has a triangular prism structure. The second prism has a quadrangular prism structure. The largest side of the first prism is parallel to the largest side of the second prism. The translation assembly is configured to drive the first prism to translate along a direction perpendicular to the direction of the laser beam propagating between the first prism and the second prism. The Q switch and the output coupling mirror are arranged in sequence behind the prism group. By changing the resonant cavity length through the double prisms and the translation assembly, the pulse width is adjusted in a wide range. Thus, the embodiment improves the efficiency of clinical surgery.

Optical assembly for generating the second and third harmonic frequencies of a laser beam using two optically nonlinear crystals (C1 and C2) placed in a temperature-controlled environment. The first optically nonlinear crystal (C1) converts the fundamental harmonic frequency to the second harmonic, while the second optically nonlinear crystal (C2) converts the fundamental and second harmonics to the third harmonic. The system includes beam intensity attenuation mechanisms using a first half-wave plate (HWP1) and first and second polarizers (P1, P2) that direct the beam according to the user's requirements. Motorized linear shifts (T1, T2) provide switching between harmonic frequency generation modes. Different cuts of the optically nonlinear crystals (C1 and C2) allow for optimization of phase matching and conversion efficiency. This assembly is designed for highly accurate and flexible generation of harmonic laser beams with wide industrial applications, especially in laser micromachining.