532results about "Active medium material" patented technology

A flight path clearing system comprising a laser beam system in an aircraft and a controller. The controller is configured to select a number of characteristics for a laser beam based on an object type. The controller is configured to control the laser beam system to emit the laser beam with the number of characteristics in a direction relative to a flight path of the aircraft. The controller is configured to control the laser beam system to move the laser beam with the number of characteristics selected for the object type to scan an area using a pattern that is based on a sequence of locations in the pattern being nearest to a center of the area, wherein a number of objects of the object type hit by the laser beam is cleared from the flight path.

The invention discloses a high-tolerance synchronous dual-band pulse laser, and relates to the field of lasers, and the laser comprises a first resonant cavity and a second resonant cavity; the first resonant cavity comprises a first pumping source and an optical annular cavity formed by sequentially connecting a first wavelength division multiplexer, a first thulium-doped optical fiber, a first optical coupler, a first isolator, a second wavelength division multiplexer, a high-nonlinearity saturable absorber, a third wavelength division multiplexer and a first polarization controller; the second resonant cavity comprises a second pumping source and an optical annular cavity which is formed by sequentially connecting a fifth wavelength division multiplexer, a second erbium-doped fiber, a second optical coupler, a second wavelength division multiplexer, a high-nonlinearity saturable absorber, a third wavelength division multiplexer, an electric control adjustable delay line, a fourth wavelength division multiplexer, a second polarization controller and a second isolator, and the fifth wavelength division multiplexer, the second erbium-doped fiber, the second optical coupler, the high-nonlinearity saturable absorber, the third wavelength division multiplexer, the electric control adjustable delay line, the fourth wavelength division multiplexer, the second polarization controller and the second isolator; and the first optical coupler and the second optical coupler respectively output synchronization pulses in the wave bands of 2 microns and 1.5 microns. The device is compact in structure, low in manufacturing cost, convenient to operate and capable of covering the mid-infrared band of 2 microns.

The invention provides a holmium and ytterbium co-doped mid-infrared microsphere Raman laser and a preparation method thereof, and relates to the technical field of laser preparation, the holmium and ytterbium co-doped mid-infrared microsphere Raman laser comprises an infrared transmission optical fiber, a pump light source, holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres, pump light emitted by the pump light source is guided to a conical region through the infrared transmission optical fiber, and the holmium and ytterbium co-doped tellurate glass microspheres and the passive tellurate glass microspheres are arranged in the conical region; sequentially carrying out optical coupling with holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres; in the holmium and ytterbium co-doped tellurate glass microspheres, the doping amount of the holmium element is 0.3%, and the doping amount of the ytterbium element is 0.45% according to the mass percentage. Compared with the prior art, through the cascade structure of the holmium-ytterbium co-doped microspheres and the passive microspheres, three-step wavelength conversion of pump light-rare earth ion lasing-Raman frequency shift is realized in a single system for the first time, and the wavelength limitation that a traditional single microsphere depends on a rare earth ion fixed energy level is broken through.

A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes: an electrical steel sheet substrate; and an insulating film layer that is disposed on the electrical steel sheet substrate. At least one deformation portion having a linear shape is formed on a surface of the electrical steel sheet substrate, and a natural corrosion potential value of the electrical steel sheet is -350 mV or more.

The invention discloses a dual-wavelength microsphere laser based on tri-doped rare earth ions and a preparation method thereof, the dual-wavelength microsphere laser based on tri-doped rare earth ions comprises a silica fiber, the middle part of the silica fiber is provided with a conical region; the pump light source is arranged at one end of the silica fiber; the erbium, holmium and ytterbium tri-doped tellurate glass microspheres are arranged in the conical region; pump light emitted by the pump light source is guided to the conical region through the single-mode optical fiber and is optically coupled with the erbium-holmium-ytterbium tri-doped tellurate glass microsphere; in the erbium-holmium-ytterbium triple-doped tellurate glass microspheres, infrared-transmitting tellurate glass is used as a matrix, and the doping amount of an erbium element is 0.11%, the doping amount of a holmium element is 0.22%, and the doping amount of an ytterbium element is 0.80% in percentage by mass. According to the dual-wavelength microsphere laser based on the three-doped rare earth ions, efficient and stable dual-wavelength laser output is achieved.

The invention provides a laser crystal heterogeneous bonding method and an optical element, and relates to the technical field of laser, and the method comprises the steps: carrying out the ultra-precise surface treatment of the to-be-bonded surfaces of a laser crystal and a heterogeneous material based on the laser crystal and the heterogeneous material; respectively depositing at least one transition layer on the two to-be-bonded surfaces after surface treatment through a physical or chemical deposition method; the outermost layers of the two transition layers are made of the same material; carrying out ion beam activation treatment on the two surfaces to be bonded on which the transition layers are deposited so as to form high-activity surfaces; and aligning the two activated surfaces to be bonded in a vacuum environment at room temperature and applying pressure, and realizing room-temperature bonding through electrostatic force and chemical bond action to obtain a bonding body of the laser crystal and the heterogeneous material. According to the invention, thermal-mechanical property and chemical property differences among heterogeneous materials are overcome, and high-strength, low-stress and high-optical-quality bonding is realized.

Systems and methods of in situ pressure control at an anatomical environment during a procedure are disclosed. An exemplary irrigation and suction system comprises a user input configured to receive from a user a desired pressure to be applied to the anatomical environment, or a desired flow condition corresponding to the desired pressure. The system comprises a pressure sensor to sense a pressure at or near the anatomical environment, and a control module to adjust one or more of an irrigation flow rate or a suction flow rate of at least one working channel of a medical device to maintain the pressure of the anatomical environment at substantially a level of the desired pressure, or to maintain the desired flow condition in the working channel during the procedure.

The invention provides a high-power wide-spectrum long-wave infrared femtosecond laser generation method, and relates to the technical field of infrared ultrafast laser. According to the method, the 1.5 [mu] m pumping BGSe crystal is adopted, compared with a traditional 1 [mu] m pumping BGSe crystal, the heat accumulation effect is greatly reduced, and the operation stability of the system is remarkably improved in combination with a water-cooling heat dissipation device. Through crystal cutting angle optimization and phase matching design, 10-16 [mu] m wide-spectrum long-wave infrared femtosecond laser output is achieved, the power reaches 100 mW, and the application requirements in the fields of molecular spectrum recognition, environment monitoring and the like are met.

Systems and methods of in situ unclogging a working channel in a medical device during a procedure are disclosed. An exemplary unclogging system comprises a flow sensor to sense a flow rate through a working channel, and a control module to detect a channel state indicating a presence or absence of clogging based on the flow rate. In the presence of channel clogging, the control module can control one or more of an irrigation source or a suction source to provide respectively irrigation fluid or suction pressure to unclog the obstructed channel. The control module can adjust one or more of an irrigation flow rate or a suction flow rate through the working channel to maintain a desired pressure of the anatomical environment at the anatomical site, or to maintain a desired flow condition in the working channel, during the procedure.

The invention relates to a high-power dual-wavelength erbium-doped solid laser, and belongs to the technical field of laser. The high-power dual-wavelength erbium-doped solid laser comprises a pumping source, a pumping cavity, a diamond, a heat sink, a first resonant cavity and a second resonant cavity, the first resonant cavity comprises a first erbium-doped YAG slice crystal, and the second resonant cavity comprises a second erbium-doped YAG slice crystal. The first erbium-doped YAG sheet crystal is used for generating 1.64 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the first resonant cavity; and the second erbium-doped YAG sheet crystal is used for generating 2.94 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the second resonant cavity. According to the high-power dual-wavelength erbium-doped solid laser provided by the invention, synchronous output of 1.64 mu m and 2.94 mu m dual-wavelength laser is realized, the multifunctionality and medical adaptability of the laser are enhanced, and multi-type treatment requirements of soft tissues and hard tissues can be met at the same time.

Systems and methods of in situ unclogging a working channel in a medical device during a procedure are disclosed. An exemplary unclogging system comprises a flow sensor to sense a flow rate through a working channel, and a control module to detect a channel state indicating a presence or absence of clogging based on the flow rate. In the presence of channel clogging, the control module can control one or more of an irrigation source or a suction source to provide respectively irrigation fluid or suction pressure to unclog the obstructed channel. The control module can adjust one or more of an irrigation flow rate or a suction flow rate through the working channel to maintain a desired pressure of the anatomical environment at the anatomical site, or to maintain a desired flow condition in the working channel, during the procedure.

An active LMA optical fiber for mitigating Transverse Mode Instability effects is provided. The core of the fiber includes a center core region having one or more rare-earth center dopants and one or more center co-dopants, and a peripheral core region free of rare-earth dopants and having one or more peripheral dopants. The radial refractive-index profile of the core is generally continuous across a boundary between the center core region and the peripheral core region. The selection and the concentrations and distributions of the rare-earth center dopants, the center co-dopants and the peripheral dopants are such that the temperature coefficient is lower in the peripheral core region than in the center core region.

A fiber laser device comprises a ring shaped resonator (1) to generate pulses in a mode-locked regime, the ring shaped resonator (1) comprising a doped fiber (10), a virtual saturable absorber (11) receiving the output of the doped fiber (10), a standard fiber (12) connected to the virtual saturable absorber (11) and connected in loop to the doped fiber (10), the resonator (1) including an isolator (16) for unidirectional laser propagation from the doped fiber (10) to the saturable absorber (11), the virtual saturable absorber (11) comprising a splitter (115) to output a part of the light as main output, The doped fiber (10) is selected to operates in a regime where the group-velocity dispersion is negative within the selected band, the splitter (115) outputting more than 85% of the light power from the resonator (1), the resonator (1) comprising filtering means (17) selecting a band of light coupled to the standard fiber (12). Method of controlling such a device.

Embodiments of the present disclosure comprise an optical amplifier system, with the system comprising an erbium-doped fiber amplifier comprising a C band EDFA configured to generate C band light, and an L band EDFA configured to generate L Band light. A Raman amplifier comprising a fiber span may be pumped using a backward pump light.

This invention relates to a compound, magnesium gallium selenide (MgHgGa4Se8), and a magnesium gallium selenide (MgHgGa4Se8) infrared nonlinear optical crystal, along with their preparation methods and applications. The compound has the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol. The crystal, also with the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol, lacks a center of symmetry, belongs to the tetragonal crystal system, and has a space group of MgHgGa4Se8. Its cell parameters are α = β = γ = 90°, Z = 1, and its volume is determined by the high-temperature melt method, chemical vapor transport method, or crucible lowering method. This crystal exhibits advantages such as significant nonlinear optical effects, good crystal growth habit, good mechanical properties, high hardness, resistance to breakage and deliquescence, and ease of processing and storage. It can be used to fabricate infrared nonlinear optical devices, which have important applications in optoelectronic warfare, laser communication, and medical fields.

A passively, Q-switched laser is described. The laser may operate at an eye-safe lasing wavelength of 1.34 microns and use a gain element of Nd:YVO4 and a saturable absorber element of V:YAG with a space separating the gain element and saturable absorber element. The Q-switched laser is pumped by a grating stabilized laser diode. The laser may be used in laser ranging applications.

Hybrid integrated photonic integrated circuit laser comprising a photonic integrated circuit including an elongated optical waveguide comprising an elongated gain medium waveguide, at least a first and second optical reflector, the gain medium waveguide being located or extending between the first and second optical reflectors and being located inside an optical cavity to provide optical feedback. Further comprising a pump laser diode to provide electromagnetic radiation to the gain medium waveguide. The elongated optical waveguide, and the first and second optical reflectors are monolithically integrated inside the photonic integrated circuit. The gain medium waveguide comprises a rare-earth ion implanted silicon nitride waveguide core. The pump laser diode is positioned adjacent to the at least one photonic integrated circuit and is edge coupled or facet coupled to a lateral edge or a facet of the photonic integrated circuit to provide pump radiation to the rare-earth ion implanted silicon nitride waveguide core.

The application discloses a 2 mu m wave band GHz solid mode-locked device based on electric regulation, belongs to the technical field of ultrafast laser and semiconductor device, and comprises a high-brightness fiber laser pumping source, an optical focusing coupling system for focusing and collimating the pumping source, a first input mirror for transmitting and reflecting the focused laser beam, a gain medium for generating and amplifying laser, a second input mirror and a third input mirror for reflecting the focused laser beam, and a two-dimensional Bi2O2Se electro-optic modulation device for modulating the laser beam. The application develops the two-dimensional Bi2O2Se electro-optic modulation device with low saturation flux, fast saturation recovery time and moderate modulation depth, so as to break through the technical barrier of solid GHz femtosecond mode-locked.

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

This invention provides a fast frequency closed-loop control method and system for an alkali metal atomic magnetometer laser, comprising: setting the laser current and laser temperature, calculating and obtaining the laser frequency closed-loop control signal SigX; and controlling the laser frequency based on the offset value of the frequency closed-loop control signal SigX and the correlation function f(I) = φ(I, SigX) between the current value and SigX. X The process involves calculating and obtaining the current adjustment value ΔI0, which is then directly applied to the laser current. The difference between the current adjustment value I1 and the set value I0 is calculated as ΔI1. Based on the correlation function f = φ(f(I), f(T)), the temperature change ΔT1 corresponding to the current change ΔI1 is calculated. This temperature adjustment ΔT1 is then applied to the laser temperature. By adjusting the laser temperature to T1, the laser current value is changed back from the adjustment value I1 to the initial set value I0. This invention addresses the problem in existing technologies where using laser current as a feedback signal for closed-loop control of laser frequency easily affects the laser's performance and consequently its lifespan.

The invention discloses rare earth Yb < 3 + > / Tb < 3 + > co-doped zinc borophosphate luminescent glass, a preparation method and application thereof, the glass can realize tunable green light emission under excitation of 274 nm ultraviolet light and 980 nm near-infrared light wavelength, has excellent optical performance and thermal stability, and can be applied to the fields of solid-state lasers, biosensing detection and the like. The rare earth Yb < 3 + > / Tb < 3 + > co-doped zinc borophosphate luminescent glass disclosed by the invention is prepared from the following raw materials in percentage by mass: 44.5 to 54.5 percent of P2O5, 20.5 to 29.5 percent of H3BO3, 10.5 to 19.5 percent of ZnO, 0.5 to 5.0 percent of Li2CO3, 0.5 to 5.0 percent of Na2CO3, 0.5 to 4.5 percent of Gd2O3, 0.1 to 0.9 percent of rare earth oxide Yb2O3 and 0.6 to 1.5 percent of rare earth oxide Tb4O7.

A composite cavity structure for generating multiple vortices relates to the technical field of vortex lasers. To address the problem in the prior art that vortex lasers can only output a single vortex but not multiple vortices, the present application inserts a lens into the cavity and combines it with a plane reflector mirror engraved with a point defect. By adjusting the position of the plane mirror in the branch and the size of the point defect, high-order vortex beams can be effectively generated and the order can be adjusted. Vortex beams of different orders in multiple branches are output through the same output coupler, thereby generating multiple vortex beams.

A kind of multi-wavelength selection laser based on Ho doped crystal and its wavelength tuning method belong to the field of optoelectronic device manufacturing and optical engineering laser technology.To solve the function of multi-wavelength output of multi-wavelength selection laser, the pump source of 1940nm is connected with fiber coupler through fiber, the fiber coupler is arranged with fiber coupling lens group, polaroid, input plane mirror, Ho doped mixed crystal, output plane mirror and 1900nm narrow band filter in sequence along the light path;The Ho doped mixed crystal is composed of first square doped crystal, second square doped crystal, third square doped crystal and fourth square doped crystal, and the combination includes Ho: LLF crystal, Ho: YAP crystal and Ho: YLF crystal cut in different axial directions.The present application can efficiently realize tunable multi-wavelength output.By combining Ho doped crystals with different substrates, a laser is used to realize multi-wavelength output in a wide wavelength range.

A gas laser apparatus according to an aspect of the present disclosure includes a laser chamber, a primary electrode, a preliminary ionization electrode, a power supplier, and a processor. The laser chamber is configured to encapsulate a laser gas containing a fluorine gas. The primary electrode is disposed in the laser chamber. The preliminary ionization electrode is disposed in the laser chamber. The power supplier is configured to supply power to the primary electrode and the preliminary ionization electrode. The processor is configured to control the power supplier to perform first discharge control that causes the preliminary ionization electrode and the primary electrode to perform discharge, and second discharge control that causes only the preliminary ionization electrode to perform discharge without causing the primary electrode to perform discharge.

The application discloses a low-stress Al2O3 / YAG transparent ceramic gradient film, a preparation method and application, the Al2O3 / YAG transparent ceramic gradient film is deposited on a sapphire substrate, through sintering, yttrium ions in the YAG film and aluminum ions in the Al2O3 film diffuse with each other, the continuous and gentle change of the thermal expansion coefficient is realized, so that the prepared gradient film can effectively disperse thermal stress.The preparation method comprises the following steps: pretreating the sapphire substrate; using an Al2O3 ceramic target and a YAG ceramic target, depositing each layer in turn through magnetron sputtering, and then performing high-temperature sintering to form the gradient film structure.The film has the characteristics of obvious thermal stress buffering effect, optical transparency and strong film-substrate bonding force, and can be applied to the fields of optical crystal bonding, semiconductor and electronic packaging, high-temperature protection and thermal barrier coating and the like.

A tunable dual-polarization and dual-frequency laser source (1) adapted to emit an output beam (FS) having a first frequency according to a first linear polarization and a second frequency according to a second linear polarization perpendicular to the first linear polarization, the laser source comprising an optical cavity (C) comprising the following elements arranged between a highly reflective element (M1) and an output coupler (M2): a second electro-optical crystal (EO2) in a second material having a second optical axis with the same direction and the same orientation as the second linear polarization and comprising a second pair of electrodes (E2) adapted to apply within the second electro-optical crystal a second voltage according to a direction of the second linear polarization,the first and second materials being adapted so that there are first and second voltages adapted to independently control a value of the first frequency and a value of the second frequency included in the output beam (FS). [Fig.3],

Disclosed is a pulsed laser apparatus and method of generating a laser pulse. The apparatus includes an input coupler configured to receive pumping light from a pumping light source and a seed pulse from a seed pulse generator. The apparatus further includes a doped fiber-optic cable with an input port at a first end configured to receive the pumping light and the seed pulse. The doped fiber-optic cable amplifies the seed pulse to generate an output pulse. Along a first length of the doped fiber optic cable, the pulse spectrum broadens rapidly owing to nonlinearity. Beyond the first length in an extended portion, the output pulse shifts towards longer wavelengths and broadens in both spectral and temporal domains. The apparatus also includes an output port at a second end of the doped fiber-optic cable, wherein the output pulse exits the doped fiber-optic cable at the output port.

A single-material-double-process parametric laser-wavelength converter includes a pump-laser source, a nonlinear optical material, a first optical reflective element, and a second optical reflective element. The pump-laser source is configured to emit a pump-laser pulse light. The nonlinear optical material receives the pump-laser pulse and generates a signal-laser pulse and a partially depleted pump-laser pulse through optical parametric amplification. The first optical reflective element is configured to reflect the signal-laser pulse back to the same nonlinear optical material. The second optical reflective element is configured to reflect the partially depleted pump-laser pulse back to the same nonlinear optical material. With an appropriate adjustment on the reflecting path lengths, the nonlinear optical material is configured to receive the temporally synchronized signal-laser pulse and the partially depleted pump-laser pulse to generate an idler output through difference frequency generation. Both optical parametric amplification and difference frequency generation occur in the same nonlinear optical material.

The invention relates to a light source for optically pumping a laser-active medium (7). It is an object of the invention to provide a pump light source, which is improved, in particular is more efficient, compared with the prior art, the pump light of which is generated by non-linear frequency conversion. For this purpose, according to the invention, the light source comprises a multi-core optical waveguide (1), which comprises a plurality of light-guiding cores (2) extending along the longitudinal extent of the multi-core optical waveguide (1). A frequency converter (4) is connected downstream of the multi-core optical waveguide (1) in the beam path, which is designed to convert individual beams (5) emitted from the cores (2) of the multi-core optical waveguide (1) into frequency-converted individual beams (6) in separate non-linear elements of the frequency converter (4) each assigned to the respective individual beams (5). A superposing optical unit is provided, to superimpose the frequency converted individual beams (6) in the laser-active medium (7), in order to optically pump the latter. Finally, the invention relates to a laser system, which uses such a light source as a pump light source, and to a method for optically pumping a laser-active medium (7).

The application discloses a concentration gradient design method of a laser amplifier gain medium and the laser amplifier gain medium, and relates to the technical field of laser amplification, and aims to solve the heat effect problem that heat distribution is uneven due to uneven pump light absorption distribution of the laser amplifier gain medium. Technical points of the application include: according to the heat conduction equation, the phase difference of each section of the crystal corresponding to the seed light passing through the pump light region when the laser amplifier amplifies the seed light is calculated and obtained; according to the phase difference of each section of the crystal through which the seed light passes being equal, the phase difference of each section of the crystal corresponding to the seed light passing through the pump light region is set to be equal; the absorption coefficient of each section of the crystal is obtained by iterative solution using simulation software; and the concentration gradient of each section of the crystal is calculated and obtained according to the relationship between the absorption coefficient and the concentration gradient. According to the application, the concentration distribution of the laser amplifier crystal is designed according to the depolarization generated by the seed light passing through the amplification laser medium, so that the purpose of reducing the thermal depolarization effect from the root is achieved.