34 results about "Active medium" patented technology

An optical system includes a light-receiving plane, a lens group, a pixel-based diaphragm, and a driving unit. The lens group is configured to direct an incident light to the light receiving plane. The pixel-based diaphragm is at an aperture stop of the lens group. The pixel-based diaphragm includes a first substrate coated with pixelated electrodes; a second substrate coated with an electrode; and an active medium layer between the first substrate and the second substrate. The driving unit is electrically coupled with the pixel-based diaphragm and configured to control the pixel-based diaphragm to have a first light transmitting pattern at a first time duration and a second light transmitting pattern at a second time duration, wherein the first light transmitting pattern is different from the second light transmitting pattern.

The invention discloses a section positioning method for a latent fault of an active medium-voltage distribution cable, relates to the technical field of power distribution network fault positioning, and solves the problems of short duration, small fault energy and difficulty in fault positioning of the latent fault of the cable in the prior art. The method comprises the following steps: firstly, detecting whether a latent fault occurs in real time, if so, collecting 1 / 4 period zero-sequence current data of each monitoring point of a fault line after the fault, and performing generalized S transformation; then, zero-sequence current transient energy value features, zero-sequence current transient energy polarity features and zero-sequence current amplitude time-frequency matrix correlation features of the sections are extracted; based on the three-dimensional coordinates of the sections, Euclidean distances among the sections are calculated, and a correlation matrix is established; and finally, calculating a comprehensive distance similarity coefficient between each section and other sections, and judging a fault section based on the comprehensive similarity coefficient of each section.

The method suggests coating the transparent solid with an additional laser radiation absorptive layer of material and then laser texture the coated solid to attain a nanostructured transparent solid with increased transmissivity while the additional coating 5 is removed. This method is applicable but not limited to a substrate transparent solid like glasses of silicate composition, such as fused silica, borosilicates, aluminosilicates, alkali aluminosilicates, float glasses, crown glass, amorphous sapphire etc., crystals, for example crystalline sapphire, laser active medium crystals etc. and polymers, for example polycarbonate, plexiglass etc. It is also applicable to substrates coated with a thin film of 0 above mentioned materials.

Silicon photonic crystal (10; 10′; 10″) comprising periodic silicon structures (12) contiguous with voids (14), and a silicon resonant cavity (16) consisting of silicon nanowires (18) entirely made of silicon with uniform doping, said nanowires acting as active medium of the photonic crystal.

The invention provides a crystal lattice type flexible pressure sensor for a deep sea environment and a preparation method thereof. The crystal lattice type flexible pressure sensor for the deep sea environment comprises an active dielectric layer; wherein an interdigital electrode is arranged on the lower surface of the active dielectric layer, and packaging layers are arranged on the upper surface of the active dielectric layer and the lower surface of the interdigital electrode; and a lattice structure is formed in the active dielectric layer. According to the crystal lattice type flexible pressure sensor for the deep sea environment and the preparation method thereof, the technical problem that an existing flexible sensor cannot normally operate in the deep sea environment can be solved.

A laser device according to various embodiments includes: a housing; an inlet valve disposed in a first direction of the housing and configured to flow cooling water; an outlet valve disposed in a second direction of the housing and configured to discharge cooling water; a laser output unit which is accommodated in the housing and is configured so as to apply a power supply to output a laser beam; and a cooling structure for cooling the laser output unit, the cooling structure may include: a support member for accommodating the laser output unit therein; and a flow path that is formed on the surface of the support member so as to face the inside direction of the support member and that provides a path through which the cooling water flows. According to the utility model, by using the supporting component with the micro-channel, not only can the laser active medium be directly cooled by using cooling water, but also the vibration caused by the flow velocity is inhibited by using the micro-channel.

A device for color conversion is provided. The device comprises a Distributed Bragg Reflector (DBR) structure on a substrate and a metasurface comprising a plurality of nanostructures is disposed on the DBR. Each nanostructure includes a first dielectric layer with a first refractive index on a second dielectric layer with a second refractive index, the first refractive index being different from the second refractive index. An active medium comprising quantum dots is disposed in between the plurality of nanostructures. The geometric parameters of the plurality of nanostructures are controlled such that the cavity modes of different natures can be tailored to match the absorption spectra of the active medium. This enhances absorption of incident light and color-conversion efficiency.

An extreme ultraviolet light generation apparatus includes a first light source outputting first excitation light, a laser oscillator including an active medium and performing laser oscillation by irradiating the active medium with the first excitation light to output the laser light, a measurement instrument measuring a pulse energy and a pulse time width of the laser light, a temperature regulator that adjusts a temperature of a cooling medium that cools the first light source, and a processor. The processor controls the temperature regulator to adjust the temperature of the cooling medium so that the pulse energy measured by the measurement instrument falls within a target range of the pulse energy, and adjust a current value of a current supplied to the first light source so that the pulse time width measured by the measurement instrument falls within a target range of the pulse time width.

A method and extruder for producing carbon blocks using poly(vinylidene fluoride) (PVDF) as a binder and an adsorbent such as activated carbon is disclosed.

The present invention relates to an end-pumped system for efficiently pumping a laser active medium. The system comprises a laser diode stack emitting an optical beam, equipped with a fast axis collimator that defocuses the fast axis of the optical beam. A lens duct with a tapered shape and flat input and output surfaces is coupled to the diode stack. The input side of the lens duct covers the entire area of the diode stack, preventing pump beam escape through total internal reflection on its side surfaces. The system further includes a laser active medium, coupled to the output side of the lens duct. The invention enables precise control of pump beam divergence angles and can incorporate various materials for the lens duct, including borosilicate crown glass, fused silica, calcium fluoride, zinc selenide, germanium, undoped YAG, polymethyl methacrylate, or sapphire. Applications of the system include solid-state lasers and its utilization as a part of laser amplifiers and oscillators, offering enhanced performance and efficiency in laser technologies.

The invention relates to the technical field of hydrogen storage materials, in particular to a doped symbiotic LaH2.46-La2O3 ultra-fine grain low-temperature reversible hydrogen absorption and desorption magnesium-based composite hydrogen storage material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing LaH < 2.46-La > powder; the LaH < 2.46-La > powder is subjected to ball milling under the air atmosphere, and symbiotic LaH < 2.46-La2O3 powder is prepared; the preparation method comprises the following steps: carrying out ball milling on the symbiotic LaH < 2.46 >-La2O3 powder, Mg powder and Ni powder in an argon atmosphere to prepare nano composite powder; hydrotreating the composite powder; carrying out dehydrogenation treatment on the hydrogenated composite powder; the composite powder hydrogenation step and the hydrogenated composite powder dehydrogenation step are sequentially and repeatedly circulated for multiple times, and the composite powder is obtained. According to the scheme, excellent dynamic performance and cycling stability are achieved, and the composite material can be used as a hydrogen storage medium, can be used as an active medium for storing and transporting hydrogen in a solid-state hydrogen storage device, has the characteristics of high hydrogen storage density, relatively low hydrogen absorption and desorption temperature, good hydrogen absorption and desorption cycling stability, high safety, environment friendliness, low cost and the like, and has wide application prospects. And the application is not limited to a solid hydrogen storage device and can also be used as a heat exchange medium of a heat pump.

For an applicator for needleless injection of an active medium (WM), which permits a high injection pressure and ensures a reliable and secure separation of the injectable active medium (WM) from the actuation of the device (1), an injection valve (20) is provided in the applicator (B) and a working medium (AM) with a working pressure (pA) can be applied at an inlet (27) of the injection valve, a pressure volume (21) is provided in the applicator (B), and the pressure volume (21) is filled with working medium (AM) at an initial pressure less than the working pressure (pA), the operational injection valve (20) is configured to inject into the pressure volume (21) a predetermined injection quantity of the working medium (AM) with an injection pressure (pE) between the working pressure (pA) and the initial pressure, and there is provided in the applicator (B) a movably arranged plunger (22), which at a first end has a plunger piston (26) that at least partially delimits the pressure volume (21), and which, with an opposite second end, bears on the pressure piston (25) such that the operational plunger (22) is movable in the direction of the pressure piston (25) in order to move the pressure piston (25) so as to deliver an active-medium pulse from at least nozzle opening (29)m, (FIG. 2).

The present invention relates to a circuit for pumping an active medium of a laser, wherein the circuit is adapted to generate pumping voltage pulses by summing at least two mutually time-shifted voltage pulses, and to apply the pumping voltage pulses to a pump for pumping the active medium of the laser. The present invention also relates to a laser comprising such circuit.

The invention relates to an EUV driver laser (16) for generating a plasma of a target material (20) emitting EUV light (14). The EUV driver laser (16) has a beam source arrangement (30) having at least one beam source (32), which is designed to generate a light beam (34) having a first wavelength λ1. Furthermore, the EUV driver laser (16) has an amplifier arrangement (36) having at least one optical amplifier (38) which has a first active medium (48), wherein the optical amplifier (38) is designed to optically amplify at least a portion of the light beam (34) passing through the optical amplifier (38) to form an amplified light beam (18). A pump source arrangement (40) is provided, which has at least one optical pump source unit (42) which has a second active medium (50), wherein the optical pump source unit (42) is designed to generate a pump beam (44) having a second wavelength λ2 and to supply the optical amplifier (38) with optical pump energy.

The present invention relates to a light source for optically pumping a laser active medium (7). The object of the present invention is to provide an improved, and in particular more efficient, pump light source compared to the prior art, in which the pump light is generated by nonlinear frequency conversion. To this end, the present invention proposes that the light source includes a multicore optical waveguide (1), the multicore optical waveguide (1) includes a plurality of photoconductive cores (2) extending along the longitudinal length of the multicore optical waveguide (1). A frequency converter (4) is connected downstream of the multicore optical waveguide (1) in the beampath, the frequency converter (4) is configured to convert a plurality of individual beams (5) emitted from the plurality of cores (2) of the multicore optical waveguide (1) into a plurality of frequency-converted individual beams (6) in a plurality of mutually distinct nonlinear elements of the frequency converter (4), each associated with an individual beam (5). A superimposed optical system is provided to superimpose the plurality of frequency-converted individual beams (6) in the laser active medium (7), thereby optically pumping the laser active medium (7). Finally, the present invention relates to a laser system using such a light source as a pump light source, and a method for optically pumping a laser active medium (7).

The method suggests coating the transparent solid with an additional laser radiation absorptive layer of material and then laser texture the coated solid to attain a nanostructured transparent solid with increased transmissivity while the additional coating 5 is removed. This method is applicable but not limited to a substrate transparent solid like glasses of silicate composition, such as fused silica, borosilicates, aluminosilicates, alkali aluminosilicates, float glasses, crown glass, amorphous sapphire etc., crystals, for example crystalline sapphire, laser active medium crystals etc. and polymers, for example polycarbonate, plexiglass etc. It is also applicable to substrates coated with a thin film of 0 above mentioned materials.

The application provides a p-cresol uniform dispersion device in a cavity, relates to the technical field of medium dispersion equipment, and comprises a tank body, a pressure relief pipe is fixedly installed outside the tank body, a pressure relief assembly is installed inside the pressure relief pipe, a display screen is further installed outside the tank body, and a fixed column is fixedly installed inside the tank body. In the application, the connecting shaft of the mixed fan surface is rotatably connected in the device groove inside the fixed column, the gas sprayed by the gas outlet pipe acts on the mixed fan, the mixed fan changes the spraying direction of the airflow when rotating, breaks the agglomeration state of the medium, so that the active medium can be better dispersed in the tank body, the problems that the traditional dispersion device lacks real-time monitoring and intelligent control functions inside the cavity, is easy to have a mixing dead angle, is difficult to adjust the spraying direction of the spray head according to the mixing condition, and is difficult to effectively intercept the active medium during pressure relief, and is easy to cause the loss of the medium, waste of raw materials and pollution of the environment are solved.

The invention relates to a light source for optically pumping a laser-active medium (7). The aim of the invention is to provide a pump light source which is improved, in particular more efficient, compared to the prior art, and which generates pump light by means of a non-linear frequency conversion. For this purpose, the invention proposes that the light source comprises a multi-core optical waveguide (1) comprising a plurality of light-guiding cores (2) extending along a 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 frequency converter is designed to convert individual light beams (5) emitted from the cores (2) of the multi-core optical waveguide (1) into frequency-converted individual light beams (6) in separate non-linear elements of the frequency converter (4), each separate non-linear element of the frequency converter is assigned to a respective individual light beam (5). A superimposition optical unit is provided for superimposing the frequency-converted individual light beams (6) in the laser-active medium (7) in order to optically pump the latter. Finally, the invention relates to a laser system using such a light source as a pump light source and to a method for optically pumping a laser-active medium (7).

The invention discloses a free space Brillouin active gain medium combined cavity laser, and relates to the technical field of lasers. The laser comprises a Brillouin pump light system with a frequency stabilization function, a Brillouin-active gain combination system and a pump light system, in the Brillouin-active gain combined system, a transmission-type grating, a plane mirror, a second plano-concave mirror and an electric control displacement third plano-concave mirror form an active medium resonant cavity, and the active medium resonant cavity is used for resonance when an active gain medium is subjected to stimulated radiation; the transmission-type grating, the plane mirror, the second plano-concave mirror, the Brillouin gain medium and the electronic control displacement third plano-concave mirror form a free space Brillouin cavity. The Brillouin active gain medium combined cavity is provided in a free space, the design flexibility is high, and the functions of effectively reducing the stimulated Brillouin scattering threshold value, improving the output power or injecting the Brillouin seeds in the cavity can be achieved according to the width of the intracavity resonance light excited by the intracavity active medium.

EUV driver laser (10) for generating an EUV light beam (18) emitting plasma state of a target material (68), comprising: a plurality of laser beam sources (22) for generating a plurality of laser beams (24); a combination device (62) for combining the plurality of laser beams (24) into an excitation beam (64) for generating the plasma state; and a focusing device (66) for focusing the excitation beam (64) onto the target material (68) for generating the plasma state. Each laser beam source (22) comprises a mirror (26), an output coupling mirror (28), a laser-active medium (30) arranged between the mirror (26) and the output coupling mirror (28), and a photonic structure (34) configured to determine at least one beam parameter of the laser beam (24). The mirror (26) faces a first broadside (38) of the laser-active medium (30).The output coupling mirror (28) faces a second broadside (40) of the laser-active medium (30).

A pump light assembly (1) for a disc laser comprises a focusing device including a concave mirror (2) configured to focus a pump light beam (5) onto an active medium (3) in the form of a laser disc arranged in a focus of the concave mirror (2). A deflecting device (4) disposed about a central axis (21) of the concave mirror (2) guides the pump light beam (5) along a multi-pass path by directing the pump light beam (5) between reflecting regions and deflecting regions (.1–.50). The deflecting device (4) comprises a plurality of planar mirror prisms (41) arranged on an outer circular line (42) and on at least one further circular line (43, 44) closer to the central axis (21). The reflecting regions direct the pump light beam (5) toward the concave mirror (2) via the active medium (3) to provide successive pump passes, and the deflecting regions redirect the pump light beam (5) to a subsequent region to maintain a predefined reflection sequence. The regions (.1–.50) are formed on the planar mirror prisms (41) and / or are realized by angled mirrors (45) configured for reflection and / or deflection, wherein the angled mirrors (45) are separate from each other and not part of the planar mirror prisms (41). The multi-line arrangement provides controlled optical path lengths and supports maintaining a desired pump beam focus distribution over multiple passes.

A head-mounted display device (HMDD) operable to provide extended-reality (XR) services is provided. The HMDD includes a display, adjustable lenses that include an active medium proximate the display, a memory, and a processor device coupled to the memory. The processor device is operable to determine a visual acuity metric associated with a user and, based on the visual acuity metric associated with the user, adjust an optical characteristic of the adjustable lenses, such as refractive index, lens curvature, and / or the like. In some examples, the adjustable lenses are electro-optical lenses comprising an active liquid crystal medium that is operable to adjust an optical characteristic associated therewith in response to applied electrical stimuli. In some examples, the adjustable lenses are opto-mechanical lenses comprising an active fluid medium within a flexible membrane that is operable to adjust an optical characteristic associated therewith in response to applied mechanical stimuli.

The invention relates to laser beam apodizators for use in high-energy laser systems with at least one laser or parametric amplification module. The invention also relates to high-energy laser systems and high-energy laser radiation generation methods. It is aimed to form a laser beam of a modified profile in order to achieve the highest possible efficiency of the amplifiers of the laser system and at the same time to ensure low diffraction of the beam when it propagates through the optical elements and in free space inside and outside the laser system. A particular focus is paid to beam propagation through optical elements of a finite diameter in order to minimize the modulation of the beam spatial profile due to diffraction effect on the edges of the active media apertures. A family of functions suitable for laser beam profiles is proposed. The solution allows to increase the efficiency of the laser system of several amplification stages, compared to identical systems in which the Gaussian beam propagates. At the same time, the solution allows to build a laser system of a simpler design and lower price, compared to systems in which the super-Gaussian beam with the flat top is formed.

A device for color conversion is provided. The device comprises a Distributed Bragg Reflector (DBR) structure on a substrate and a metasurface comprising a plurality of nanostructures is disposed on the DBR. Each nanostructure includes a first dielectric layer with a first refractive index on a second dielectric layer with a second refractive index, the first refractive index being different from the second refractive index. An active medium comprising quantum dots is disposed in between the plurality of nanostructures. The geometric parameters of the plurality of nanostructures are controlled such that the cavity modes of different natures can be tailored to match the absorption spectra of the active medium. This enhances absorption of incident light and color-conversion efficiency.

A visor assembly for an automobile includes an outer perimeter. The visor assembly also includes an electrochromic device configured to switch between a transparent state and a darkened state. The electrochromic device includes a first substrate defining a first element surface and a second element surface; a second substrate spaced apart from the first substrate and defining a third element surface and a fourth element surface; and an electroactive medium positioned between the first substrate and the second substrate. The visor assembly also includes a liquid crystal device configured to switch between a transparent state and a reflective state; and a reflective polarizer positioned between the electrochromic device and the liquid crystal device.

A phase shifter that relies on a reflected wave from a load such as a varactor with a capacitance varied by an external bias voltage is provided. The phase shift does not depend on the wave propagation through an active medium. The input RF signal is sent to the variable loading and the reflected wave from the load is channeled to the output port via a network that takes the input signal without much reflection to the input terminal but passes most of the power from the variable load to the output terminal with a phase change depending on the variable bias input of the loading. Such network to steer the input to the variable loading and send the signal reflected from the loading to the output port without much reflection includes a quadrature hybrid or a circulator.

An optical power limiter, a method of manufacturing an optical power limiter, an optical device or system including an optical power limiter, and a method of limiting optical power using the optical power limiter. The optical power limiter includes: a first optical mode modulation element configured to receive an input optical signal from a first waveguide; and an active medium coupled at a first end thereof to the first optical mode modulation element such that a mode modulated optical signal based on the input optical signal can enter the active medium, where a second end of the active medium is configured to couple the mode modulated optical signal into the second waveguide as an optical output signal; wherein the active medium has a thermo-optical coefficient, so that a mode modulation optical signal entering the active medium undergoes refractive index gradient change in the active medium due to an absorption effect; and a power of the optical output signal coupled into the second waveguide is limited to a maximum power value based on a degree of mode overlap of the mode modulated optical signal and the second waveguide.

Disclosed is a method for tool-free production of a hollow structure (10), wherein the hollow structure (10) has a cross-section that varies along an axis of the hollow structure (10). The method comprises extruding (S110) an extrusion material (30) and, during the extrusion (S110), introducing (S120) an active medium (50) into an interior (38) of the extrusion material (30) in order to produce the hollow structure (10) with the varying cross-section based thereon.

The invention belongs to the technical field of laser, and discloses a high-gain organic semiconductor Raman active medium laser device and application thereof. The device comprises a substrate and an organic semiconductor Raman active medium, wherein the Raman active medium is uniformly deposited on the substrate; the organic semiconductor Raman active medium is pi-conjugated organic small molecules or polymers or a mixture of the materials. Pumping laser lasing is carried out on the prepared device, a Raman signal generated by pumping needs to be matched with stimulated radiation, namely amplified spontaneous emission (ASE) or a laser wavelength area, and therefore a stimulated Raman scattering (SRS) signal is generated. Molecular vibration in an organic semiconductor can be remarkably amplified without an optical microcavity, an ultra-low Raman threshold value is achieved in the organic semiconductor, and an obtained SRS signal has the broadband spectrum tunable characteristic. The method provided by the invention is low in cost and rapid in preparation method, and can be applied to compact and efficient organic Raman amplifiers and lasers.

An optical power limiter, a method of fabricating an optical power limiter, an optical device or system comprising an optical power limiter, and a method of limiting optical power using on optical power limiter. The optical power limiter comprises a first optical mode altering element configured to receive an input optical signal from a first waveguide; and an active medium coupled to the first optical mode altering element at a first end of the active medium such that a mode altered optical signal based on the input optical signal can enter the active medium, wherein a second end of the active medium is configured to couple the mode altered optical signal into a second waveguide as an optical output signal; wherein the active medium has a thermo-optic coefficient such that the mode altered optical signal entering the active medium experiences a refractive index gradient in the active medium as a result of absorption; and wherein the power of the optical output signal coupled into the second waveguide is limited to a maximum power value based on mode overlap of the mode altered optical signal and the second waveguide.