274 results about "Double crystal" patented technology

The invention discloses a laser frequency stabilization system based on Faraday anomalous dispersion atomic filtering, which is used for carrying out frequency stabilization on phase modulation multi-sideband laser, and comprises a frequency doubling laser unit which is configured to comprise a fundamental frequency seed light source, an electro-optical modulator, a fundamental frequency amplifier and a frequency doubling crystal; the light splitting module unit is configured to split the frequency doubling light into a main output light path and a monitoring light path; the atomic optical rotation filter is located on the monitoring light path and is configured to maintain the purity of the frequency-stabilized laser spectrum through purification treatment under the control of the axial magnetic field and the temperature; the frequency stabilization unit is configured to be a frequency stabilization light path and a servo system, and the frequency stabilization light path is used for obtaining laser frequency information and generating an error signal; the servo system is used for controlling the frequency of the fundamental frequency seed light source according to the error signal feedback. According to the laser frequency stabilization system provided by the invention, the spectrum purification and frequency stabilization precision can be improved, so that high-frequency stability locking is realized.

The invention discloses a green laser and a laser welding machine. The green laser comprises a pumping source, a first reflector, a laser crystal, a polarization beam splitter, a second reflector, a frequency doubling crystal, a telescope lens group and a spectroscope; the pumping source provides pulse pumping light; the laser crystal absorbs the pulse pump light to generate fundamental frequency laser in an infrared band, the fundamental frequency laser enters the polarization beam splitter and is split into P polarized light and S polarized light, the P polarized light is transmitted out of the resonant cavity, and the S polarized light is transmitted in the resonant cavity; and the telescope lens group converges the fundamental frequency laser to the frequency doubling crystal to generate frequency doubling laser of a green light wave band, and the frequency doubling laser is transmitted by the spectroscope and then is output. The green laser is used for spot welding of high-reflection materials such as copper and aluminum, the maximum single pulse energy can reach 5 J, the maximum peak power is 2 kW, the pulse width ranges from 0.05 ms to 5 ms, the problem of low absorption of the high-reflection materials to laser in the 1-micron wave band is solved, and the green laser is an edge tool for precise spot welding of the high-reflection materials.

The invention relates to a 213nm all-solid-state deep ultraviolet laser and application thereof, and belongs to the technical field of lasers. The laser comprises a laser diode, a pump light focusing system, a pump end mirror, a laser crystal, a deep ultraviolet output mirror, a sum frequency crystal, a frequency doubling crystal and a total reflection end mirror which are sequentially arranged along a light path, the pump end mirror, the deep ultraviolet output mirror and the total reflection end mirror form a V-shaped resonant cavity, and the laser crystal, the sum frequency crystal and the frequency doubling crystal are all cuboids. And birefringence main shafts of the laser crystal, the sum frequency crystal and the frequency doubling crystal are arranged in a staggered manner. Visible red light with the wavelength of 640 nm is adopted as fundamental frequency laser, only two-step frequency conversion is needed for output from the fundamental frequency laser to 213 nm, and the laser has the advantages of being simplified in process, small in size, easy to adjust, high in conversion efficiency, large in output power, low in manufacturing cost, stable in performance and the like.

The invention discloses a high-beam-quality 193nm ultraviolet laser generating device, and relates to the technical field of laser electronics. The device comprises a 1064nm picosecond pumping laser source and a 2053nm picosecond laser source which are used for generating pumping laser; the frequency doubling crystal, the frequency quadruplicating crystal, the 213nm sum frequency crystal and the 193nm sum frequency crystal are used for nonlinear frequency conversion; the temperature control device is used for controlling the temperature of the crystal; the dichroic mirror is used for separating the laser; the cylindrical mirror is used for beam shaping; and a lens for focusing the light beam. According to the device, a 1064nm light source is used for performing quadruplicated frequency to obtain 213nm laser, and the obtained 213nm laser and 2053nm laser are input into a nonlinear frequency conversion module to obtain 193nm laser. The device ensures high power of laser output, has good stability and excellent light beam quality, is simple in structure, and is suitable for the fields of photoetching, spectroscopy, medicine and the like.

The invention provides an efficient OPO system with a bicrystal compensation and independent pumping regulation and control structure, and relates to the technical field of laser nonlinear frequency conversion. The device comprises a pump laser, a light source regulation and control unit, an incidence adjustment unit, an OPO resonant cavity and an output separation unit which are sequentially arranged, the OPO resonant cavity comprises a walk-off compensation and frequency conversion module and a tuning module, and the walk-off compensation and frequency conversion module comprises a nonlinear crystal I and a nonlinear crystal II which have opposite cutting angles. And a tuning module is arranged between the nonlinear crystal I and the nonlinear crystal II. The OPO system based on the bicrystal structure has space walk-off angle compensation and pump light independent regulation and control capabilities, and is suitable for constructing near-infrared and intermediate-infrared laser sources with high efficiency and high stability. According to the invention, the optical path structure is flexible, the multi-crystal and multi-band adaptation is supported, and the system compatibility is good; miniaturization and intelligent integration are easy, and industrial application and popularization are facilitated.

The invention discloses a frequency doubling laser power stabilizing system. Comprising a seed light source, a first polarization-maintaining 1 # imgabs0 # 2 optical fiber coupler, a first semiconductor pumping source, a first polarization-maintaining beam combiner, a first polarization-maintaining doped optical fiber, a second semiconductor pumping source, a second polarization-maintaining beam combiner, a second polarization-maintaining doped optical fiber, a polarization-maintaining 2 # imgabs1 # 1 optical fiber coupler, a periodic lithium niobate waveguide, a temperature control system, a second polarization-maintaining 1 # imgabs2 # 2 optical fiber coupler and a photoelectric detector. After being amplified by two paths of lasers, the seed laser is converted into frequency-doubled laser through a temperature-controlled frequency-doubling crystal, a part of frequency-doubled laser is acquired and is collected by a photoelectric detector for feedback, on one hand, the frequency-doubled laser is fed back to a second semiconductor pumping source for adjusting the laser amplification power, and on the other hand, the frequency-doubled laser is fed back to a frequency-doubled temperature control circuit for adjusting the laser amplification power. The method is used for adjusting frequency-doubled output power and realizing closed-loop stability of laser power. The output power stability of the frequency-doubled laser is improved, and the frequency-doubled laser is suitable for high-precision application scenes.

The invention provides a temperature compensation method and device for laser frequency doubling, electronic equipment and a storage medium. The method comprises the steps that the initial temperature of a frequency doubling crystal of a frequency doubling laser is determined according to the power of input fundamental frequency light; adjusting the initial temperature, and determining a target temperature corresponding to the maximum value of the frequency-doubled optical power output by the frequency-doubled laser; according to the invention, active following compensation is carried out on the temperature of the frequency doubling crystal, and the temperature of the frequency doubling crystal is controlled at the target temperature, so that the active following compensation is carried out on the temperature of the frequency doubling crystal, thereby enabling the frequency doubling laser to maintain high output power, and further improving the frequency doubling efficiency of the crystal. Therefore, the laser frequency multiplier can quickly reach a steady state in the power switching process, and accurate dynamic control of the laser frequency multiplication system is realized.

The utility model belongs to the technical field of fiber lasers, and particularly relates to a high-efficiency frequency doubling system for a laser. The high-efficiency frequency doubling system for the laser comprises a first lens, a first frequency doubling crystal, a 4f system and a second frequency doubling crystal which are arranged in sequence. According to the high-efficiency frequency doubling system for the laser, the two frequency doubling crystals are used, phase matching is adopted, S polarization light and P polarization light of fundamental frequency light are subjected to frequency doubling in sequence to form P polarization frequency doubling light and S polarization frequency doubling light, two times of frequency doubling of the non-polarization-maintaining fiber laser are achieved through two times of frequency doubling, and high-power green light in the mixed polarization direction is obtained. And under the condition that the infrared fundamental frequency power is kept unchanged, the proportion of S polarization component light to P polarization component light is changed due to the change of the polarization state, but two generated green light beams are complementary, so that the power output is more stable than that of one crystal.

The invention discloses a power stabilizing method and an adjusting system of a frequency doubling laser. The stabilizing method comprises the following steps: acquiring the actual output power of the frequency-doubled laser; acquiring target output power and a set temperature value of the frequency doubling laser; and if the target output power is within the jump range of the output power of the frequency doubling laser, entering automatic power control after delaying for a preset time length. According to the technical scheme provided by the embodiment of the invention, the problems that the optimal temperature of the frequency doubling crystal dynamically changes along with the power and the environment, so that the output power of the frequency doubling laser is unstable and fluctuates are solved.

The invention relates to the technical field of femtosecond laser nonlinear frequency conversion, and discloses a femtosecond third harmonic light path control method and device, equipment and a medium. The method comprises the following steps: dividing infrared light output by a femtosecond laser into two paths according to a certain proportion by using an infrared beam splitter, namely a first path of infrared light and a second path of infrared light; the first path of infrared light enters a frequency doubling crystal for frequency doubling to generate green light, and the generated green light is subjected to beam shaping through a green light beam expanding system, so that the spot size of the shaped green light is matched with the spot size of the second path of infrared light; time delay control is applied to the second path of infrared light, so that the corresponding pulses are overlapped in time; and the second path of infrared light after time delay control and the green light after light beam shaping are combined through the spectroscope and then jointly enter a frequency combination crystal for frequency combination, the Gaussian energy distribution of the second path of infrared light and the Gaussian energy distribution of the green light are used for frequency combination, and ultraviolet light output is generated.

The invention provides a high-power blue-light solid laser for urinary surgery, which comprises a pumping source, a pumping cavity, an annular water cooling structure, a titanium-doped sapphire slice crystal, an end mirror, a diamond crystal, a focusing system, a frequency doubling crystal, a coupling system and an optical fiber, the pumping cavity is used for reflecting 532nm pumping laser so as to focus the 532nm pumping laser on the titanium-doped sapphire slice crystal; the titanium-doped sapphire slice crystal generates 803nm laser based on 532nm pumping laser; the diamond crystal enables 803nm laser to form 900nm laser through Raman frequency shift; the focusing system is used for focusing the 900nm laser into the frequency doubling crystal so as to convert the 900nm laser into 450nm blue laser through nonlinear frequency conversion; the coupling system couples the 450nm blue laser into the optical fiber to form a stable high-power 450nm blue laser light source which can be applied to urinary surgery. The blue light laser is simple in structure, the problems that an existing blue light laser is low in output power and poor in light beam quality are solved, and operation safety and efficiency are improved.

The invention discloses a double-path beam combining laser frequency doubling device, and relates to the technical field of laser frequency doubling. The first frequency multiplication module and the second frequency multiplication module share one double-sided harmonic separation mirror; the first frequency doubling module comprises a first harmonic separation mirror and a first frequency doubling crystal; the second frequency doubling module comprises a second harmonic separation mirror and a second frequency doubling crystal; one end of the first harmonic separation mirror is connected with one end of the first frequency doubling crystal; the other end of the first frequency doubling crystal is connected with one end of the double-sided harmonic separation mirror; the other end of the double-sided harmonic wave separating mirror is connected with one end of the second frequency doubling crystal; the other end of the second frequency doubling crystal is connected with one end of the second harmonic separation mirror; through the serial configuration of the two stages of frequency doubling modules, the power and time delay of two paths of laser pulses can be independently adjusted to realize real-time editing of the pulses, and the polarization characteristic of the laser can be ensured while high-power and high-beam-quality frequency doubling light is obtained.

The invention belongs to the technical field of photoetching micromachining, and relates to an overlay alignment method and device for a transparent bicrystal substrate sample covered by a film. According to the invention, transmission light is utilized to realize bimorph crystal boundary imaging in the bimorph substrate; a reflection imaging system of the photoetching machine with a microscope realizes photoetching layout imaging on the surface of the sample; by accurately adjusting the position of the focal plane, under the condition of transmission / reflection dual-mode cooperative imaging, the photoetching layout and the bicrystal boundary line are clearly visible, so that the accurate alignment of the photoetching layout and the bicrystal boundary line is realized. The method does not depend on alignment of overlay marks, the overlay process is simplified, and the overlay freedom degree is improved. According to the overlay alignment device disclosed by the invention, a transmission light source is transferred out of a photoetching system through the reflective prism, so that the problem that the light source is not uniform due to a narrow space between the overlay mask and the objective table is solved, the problems of a strong light source and heat dissipation of the strong light source are thoroughly solved, and the penetrating power of transmission light is greatly improved.

The invention discloses a titanium carbonitride-based metal ceramic alloy with a dispersive distribution micro-nano twin-crystal core ring structure and a preparation method thereof, the metal ceramic alloy comprises hard phase powder, hard phase powder, hard phase powder and hard phase powder, the hard phase powder comprises TiCN powder, TiC powder and WC powder, and the hard phase powder comprises TiC powder, TiC powder and WC powder; binding phase powder and multi-component alloy strengthening powder. According to the core-ring shell composite crystal grain, the core is 50-200 nm superfine TiCN crystal grains (high-hardness phase), and basic strength is provided; according to the annular shell, the core is wrapped with the oriented-growth TiCN whiskers with the large length-diameter ratio, the whisker bridging effect is formed, and the crack path is deflected. And dispersion bicrystal distribution: micron-sized coarse grains and submicron fine grains are in bimodal distribution according to the volume ratio of 7: 3, the coarse grains hinder crack propagation, and the fine grains inhibit grain boundary slippage. In-situ reaction strengthening: MoSiB and other components are added, a MoO / TiO self-lubricating film is generated in high-temperature friction, the wear rate is reduced, and negative wear is realized.

The invention discloses a miniature integrated infrared gas sensor chip, which belongs to the technical field of sensors, and comprises a first wafer and a second wafer, and the first wafer and the second wafer are connected in a combination manner and form an optical gas chamber; a vent hole is formed above the first wafer, and a reflective film layer is plated on the inner wall of the optical gas chamber and is arranged to only allow infrared light emitted by the infrared light source to pass through; a periodic micro-nano structure is arranged in the optical gas chamber; the surface of the second wafer is covered with an insulating film layer, and an infrared light source and an infrared detector are arranged above the insulating film layer. An optical gas chamber is formed through double-wafer bonding, a periodic micro-nano structure is integrated to enhance interaction between infrared light and gas, environmental interference is suppressed in combination with a double-channel differential detector, and meanwhile stability and selectivity are improved through multi-layer structures such as a reflective film layer, a protective film layer and a composite insulating film layer. And finally, a miniaturized and high-sensitivity gas detection function is realized.

The present invention discloses an integrated medium-wave infrared laser radar transmitting device, comprising an LD pumped laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter arranged in sequence; the LD pumped laser light source is used as a light source to emit laser to the laser crystal; the laser crystal is used to generate pulsed laser to the nonlinear frequency doubling crystal; the nonlinear frequency doubling crystal is used to double the laser frequency; the filter is used to filter out part of the laser light beam after the frequency doubling; the LD pumped laser light source, the laser crystal, the nonlinear frequency doubling crystal and the filter are an integrated packaging structure, and generate medium-wave infrared laser output. The laser radar of the present invention generates medium-wave infrared laser output, and emits the laser in a scanning form, realizing multi-angle scanning of radar transmitting end signals.

The invention discloses a signal detection system, and relates to the technical field of laser detection, and the signal detection system comprises a light source which outputs laser of a first wavelength; the first optical mirror and the second optical mirror are arranged oppositely, the first optical mirror transmits the laser of the first wavelength and reflects the laser of the first wavelength and the laser of the second wavelength to the second optical mirror, and the second optical mirror reflects the laser of the first wavelength and the laser of the second wavelength to the first optical mirror; the frequency doubling crystal is used for converting the laser with the first wavelength penetrating through the first optical lens into laser with a second wavelength, and the laser with the second wavelength is circularly reflected between the first optical lens and the second optical lens and excites a sample in the sample bin to generate a first sample signal; a part of the laser with the first wavelength penetrating through the frequency doubling crystal is circularly reflected between the first optical lens and the second optical lens and excites a sample in the sample bin to generate a second sample signal; the signal collecting device is used for collecting and analyzing the first sample signal and / or the second sample signal.

The invention belongs to the technical field of laser, and discloses a room-temperature high-energy deep ultraviolet laser generating device based on second-order and third-order nonlinear effects, which comprises a Raman crystal, a frequency doubling crystal, a frequency quadruplicating crystal, a sum frequency crystal and a color separation mirror, the fundamental frequency light is subjected to stimulated Raman scattering in the Raman crystal to generate Stokes light, and the frequency doubling crystal performs frequency doubling on the residual fundamental frequency light to generate second harmonics; frequency doubling is carried out on the second harmonic in the quadruplicated frequency crystal to generate a fourth harmonic; and the sum frequency crystal carries out sum frequency on the Stokes light and the fourth harmonic wave to finally obtain the deep ultraviolet laser with the 216.3 nm wave band. According to the invention, non-linear optical second-order harmonic conversion and third-order stimulated Raman scattering effects are combined, laser with the wavelength slightly longer than the wavelength of fundamental frequency light is obtained through stimulated Raman scattering, and the laser and fourth harmonic of fundamental frequency light are subjected to frequency summation in a large-aperture non-linear crystal under the room temperature condition, so that high-energy deep ultraviolet laser with the waveband of 210 nm is obtained.

The invention discloses a method for preparing a block alpha-HgS nonlinear optical crystal through chemical vapor transport cyclic heat treatment and application of the block alpha-HgS nonlinear optical crystal. The preparation method comprises the following steps: by taking HgS powder as a material source, carrying out chemical vapor transport cycle heat treatment for one-time growth to obtain alpha-HgS crystals; and recrystallizing the alpha-HgS crystal through chemical vapor transport cycle heat treatment, and carrying out secondary growth to prepare the alpha-HgS single crystal. According to the invention, cyclic heat treatment is carried out by adopting a secondary growth chemical vapor transport method, millimeter-scale alpha-HgS red crystal and beta-HgS black crystal are successfully grown, reversible phase change exists between the two crystals, and reversible transformation from black beta-HgS to red alpha-HgS can be promoted through temperature change in a mass transfer process by temperature control. The alpha-HgS single crystal has excellent nonlinear optical properties, can be used for frequency doubling crystals in a near-infrared band, and shows excellent laser damage resistance.

The invention relates to a semiconductor external cavity frequency doubling green laser and a preparation method, and belongs to the technical field of semiconductor lasers. On the basis of a conventional 1064nm semiconductor laser, laser is directly irradiated on a frequency doubling crystal, and meanwhile, a resonant cavity is formed by coating a cavity surface of the semiconductor laser and an output end of the frequency doubling crystal, so that a structure of a gain medium in a laser for obtaining green light in an original pumping mode is canceled, the complexity and the cost of the laser are greatly reduced, and the laser is more compact and more compact. And the batch condition is realized. And meanwhile, by adjusting the wavelength of the semiconductor laser and matching with the frequency doubling crystal, laser output with the wavelength of 510-540 nm can be realized, and the cost of the laser with the green light wave band can be effectively reduced.

The utility model provides a three-wavelength high-energy laser. A light source, a green stone crystal rod and a YAG crystal rod are arranged in the light gathering cavity, and the green stone crystal rod and the Nd: YAG crystal rod are arranged on the two sides of the light source; the focus lens is arranged on a light path on one side of light emitted by the green stone crystal rod; the bonding crystal can be selectively arranged on an emergent light path of the focus lens according to the emergent light requirement; the first beam splitter is matched with the second reflector to reflect light to the Nd: YAG crystal rod; an optical shutter between the first beam splitter and the second reflector is selected to be opened or closed according to the light emitting requirement; and selecting whether to arrange the frequency doubling crystal on the light emitting side of the Nd: YAG crystal rod according to the light emitting requirement.

A half-wave plate and a focusing lens are sequentially arranged on an output light path of a pulse width adjustable infrared laser, the focusing lens is connected with a frequency doubling crystal, the frequency doubling crystal is connected with a frequency tripling crystal, the output end face of the frequency tripling crystal is cut into a Brewster angle, and the output end face of the frequency tripling crystal is connected with a pulse width adjustable infrared laser. The output infrared laser is shielded by the infrared light blocking block after being transmitted in the space, the output green laser is shielded by the green light blocking block after being transmitted in the space, the frequency tripling crystal is connected with the imaging lens, the imaging lens is connected with the input surface of the wedge-shaped lens, and the input surface of the wedge-shaped lens is cut into a Brewster angle. Through fine adjustment of the distance between the imaging lens and the frequency tripling crystal and the distance between the wedge-shaped lens and the imaging lens, the ultraviolet laser output by the wedge-shaped lens becomes circular and is output. The Brewster angle output surface of the frequency tripling crystal reduces the ultraviolet damage probability and separates infrared light, green light and ultraviolet light. The position of the imaging lens is finely adjusted to compensate a light spot ellipse caused by a walk-off effect during frequency doubling.

The utility model discloses a multidimensional adjustable frequency doubling crystal fixing structure, and belongs to the technical field of optical element mounting and adjusting devices. According to the utility model, the problems that the fixing capability of the existing spring type adjusting frame on the frequency doubling crystal is weakened and the frequency doubling crystal moves along with the increase of the service time or the carrying of the laser and the like are solved. The device comprises a translation pedestal, a rotation supporting part, a rotation cylinder member and a frequency doubling crystal installation seat which are connected in sequence. The translation base is connected to the laser bottom plate; the rotary supporting part is rotationally connected to the upper surface of the translation base; the rotary supporting part comprises a first through hole; the rotary cylinder part comprises a cylinder main body; the cylinder main body penetrates into the first through hole and is rotationally connected with the rotary supporting part; and the frequency doubling crystal mounting seat is connected with the rotary cylinder piece. According to the utility model, all the components are rigidly connected, so that the connection stability is high, and the multi-dimensional adjustment of the frequency doubling crystal can be realized.

The present invention belongs to the field of plasma electron density measurement and discloses a plasma electron density measurement device and method based on laser wavefront analysis. The device uses a frequency doubling crystal to convert a fundamental frequency laser beam into a coaxial fundamental frequency beam and a second harmonic beam. The two coaxial laser beams produce different wavefront changes when passing through plasma, and these changes are converted into changes in the centroid displacement of a focal light spot through a microlens array. Unlike other measurement methods that require the provision of probe light and reference light, the device does not require a comparison before and after the presence of plasma, and only requires a reference to the difference in the change in the centroid of the focal light spot after two coaxial laser beams of different wavelengths pass through the plasma. The use of the measurement device can eliminate the interference of neutral particles during the experiment and eliminate the difference in laser light in two experiments with and without plasma, thereby achieving synchronous compensation and effectively solving the problem that the reference light path provided in the prior art is easily affected by the environment, thereby limiting the measurement accuracy.

The invention discloses a bamboo-based large-interlayer-spacing homogeneous graphite-like sub-crystal carbon material and a preparation method and application thereof, the bamboo-based large-interlayer-spacing homogeneous graphite-like sub-crystal carbon material comprises a homogeneous graphite-like sub-crystal carbon material, and the homogeneous graphite-like sub-crystal carbon material is characterized by being composed of 3.714.0 large-interlayer-spacing approximately-parallel oriented carbon sheets. When the homogeneous graphite-like subcrystal carbon material is used for a sodium ion battery negative electrode, the initial coulombic efficiency reaches 94.4%, the initial charging specific capacity reaches 353.5 mAh / g, and the performance is comparable with that of a lithium battery graphite negative electrode. The preparation method comprises the following steps: by taking bamboo wood as a precursor, fully inducing a macroscopic bamboo wood continuum to generate an oxygen-containing six-membered ring network intermediate product by taking a graphite container and graphite powder as double seed crystals at low temperature; and inducing an intermediate product with a proper particle size at a high temperature by taking a graphite container as a single crystal seed to prepare the graphite-like subcrystal carbon material with a uniform structure. The method takes a bamboo source as a raw material, is simple in process and low in energy consumption, and has remarkable industrialization potential.

The invention relates to the technical field of all-solid-state lasers, and particularly provides a master-slave pulse delay controllable ultraviolet dual-wavelength double-pulse laser, which comprises a pumping source and a V-shaped folded resonant cavity, and is characterized in that the V-shaped folded resonant cavity comprises an input mirror, a gain medium, a Q-switched crystal, a total reflective mirror, a frequency doubling crystal and an output mirror; wherein the Q-switched crystal performs step-type modulation through a double-step electric signal, the double-step electric signal sequentially comprises a high-voltage stage, a low-voltage stage and a voltage-reducing stage in a modulation period, and the double-step electric signal sequentially generates jump from the high-voltage stage to the low-voltage stage and jump from the low-voltage stage to the voltage-reducing stage in a pumping period. The dual-wavelength master pulse and the dual-wavelength slave pulse are respectively output, and the time delay between the dual-wavelength master pulse and the dual-wavelength slave pulse can be controlled by adjusting the duration of the low-voltage phase. According to the invention, ultraviolet dual-wavelength double-pulse output is realized, and master-slave pulse delay is flexible and controllable.

The invention discloses a high-impact-toughness titanium carbonitride-based metal ceramic alloy with a dispersed distribution micro-nano bicrystal structure and a preparation method of the high-impact-toughness titanium carbonitride-based metal ceramic alloy. The metal ceramic alloy comprises hard-phase powder, hard-phase powder and hard-phase powder, and the hard-phase powder comprises TiCN powder, TiC powder and WC powder; the bonding phase powder comprises Fe powder, Ni powder and Co powder; and a carbon and nitrogen balance powder, wherein the carbon and nitrogen balance powder comprises a carbon-containing Mo-Fe powder. A metal ceramic matrix of a micro-nano bicrystal structure is constructed on the microstructure, and a multi-stage, high-density, uniform and fine nano structure is separated out by utilizing the dispersion characteristic and interface reaction of nano composite powder; the Ti (C, N)-based metal ceramic with the strengthened and toughened micro-nano bicrystal structure is prepared through a powder metallurgy technology and a nitrogen partial pressure sintering process by combining interface regulation and control mechanisms of different doping elements and based on the combined action of mechanisms such as fine grain strengthening and second phase strengthening, and the bonding strength between metal ceramic matrix phase interfaces is improved.

The invention discloses a lamellar Ni7P3 / bicrystal phase Ni composite material prepared based on tetrabutylphosphonium chloride as well as a preparation method and application thereof, and relates to the technical field of electro-catalytic materials. The invention relates to a lamellar Ni7P3 / bicrystal phase Ni composite material prepared on the basis of tetrabutylphosphonium chloride. The lamellar Ni7P3 / bicrystal phase Ni composite material consists of a Ni7P3 compound and a Ni elementary substance, wherein the Ni elementary substance comprises a face-centered cubic structure crystal form and a hexagonal close packing structure crystal form; and the whole Ni7P3 / bicrystal phase Ni composite material is in a sheet shape. According to the lamellar Ni7P3 / bicrystal phase Ni composite material prepared by the method, stable coexistence of bicrystal phase Ni and lamellar morphology regulation and control are realized by virtue of multiple effects of a solvent of tetrabutyl phosphonium chloride, a phosphorus source and a template; according to the present invention, the overpotential at the current density of 10 mAcm <-2 > is as low as 250 mV, the electrocatalytic oxygen evolution performance is significantly improved through the synergistic effect of the Ni7P3 intrinsic activity, the heterojunction electron optimization, the bicrystal Ni function complementation and the sheet specific surface area increasing, the preparation method is controllable, the material cost is low, the material is suitable for being used as the OER working electrode, and the support is provided for the efficient hydrogen production through water decomposition.

The present invention discloses a system and method for measuring seabed microvibrations based on optical interference. The system includes a laser module, an interferometer module, a frequency doubling module, an optical path integration module, a photoelectric detection module, and a data processing module. The method comprises the following steps: S1: placing the interferometer in a seabed environment to begin measurement; S2: emitting a 1064nm infrared laser, which is divided into a reference light and a measurement light of equal optical path length, and irradiating the measurement light onto the interferometer to form a laser emission path; S3: arranging a first frequency doubling crystal on the laser return path to frequency-double the 1064nm infrared laser into a first green laser of 532nm; S4: arranging a second frequency doubling crystal on the laser return path to convert the unconverted 1064nm infrared laser in S3 into a second green laser of 532nm; S5: integrating the first and second green lasers and interfering with the reference light on the photoelectric detector to obtain the displacement change of seabed vibration. The present invention can detect seabed microvibrations below the micrometer level with high measurement accuracy.

The utility model discloses a residual laser collecting device, belongs to the technical field of lasers, and aims to solve the problems that a laser is polluted, the stability of the laser is influenced, and the use of the laser is influenced by multiple reflections in a laser shell in the prior art. The residual laser collecting device comprises a transmission light path located in a laser and used for residual laser transmission and a collecting cavity located outside the laser. The transmission light path comprises a lens, a frequency doubling crystal, a spectroscope and a reflector; the lens, the frequency doubling crystal and the spectroscope are arranged along the transmission direction of the residual laser, the residual laser is used as incident light, the incident light is transmitted and converged into the frequency doubling crystal through the lens, and emergent laser after passing through the frequency doubling crystal comprises frequency doubling laser and emergent residual laser; the frequency-doubled laser is transmitted to the light path of the other part of the laser through the spectroscope to be output; and the emergent residual laser is reflected by the reflecting mirror and then enters the collecting cavity to be collected.