159results about How to "Spectral width" patented technology

The invention discloses a distributed optical fiber sensing device based on a chaotic laser coherence method, and a measurement method of the distributed optical fiber sensing device. Chaotic laser light which is emitted from a chaotic laser is divided into detection light and reference light; the detection light is amplified by a light amplifier and then emitted into a sending optical fiber through an optical circulator, and a backward Brillouin scattering light signal is generated in the optical fiber; the Brillouin scattering light signal is amplified by the light amplifier, de-noised by a tunable light filter and then emitted into an optical fiber coupler; the optical length of the reference light is regulated by a variable light delay line, and interferes with the backward Brillouin scattering light signal which is generated by the detection light at different positions in the sensing optical fiber in the optical fiber coupler; an interference beat frequency signal is detected by a photoelectrical detector; and Brillouin gain spectra at different lengths are obtained through a data acquisition device and a signal processing device and then output to a display device, so strain or temperature sensing detection is realized.

The invention provides an antireflection and self-cleaning thin film and a preparation method thereof. According to the preparation method, a solid figure structure of a micron size is processed on a transparent flexible thin film through adopting imprinting technologies and surface modification technologies, so that the transparent flexible thin film has antireflection and self-cleaning performance; the antireflection and self-cleaning thin film is integrated on the window layer of a solar battery assembly, and as a result, the surface reflection of the window layer can be effectively inhibited, and the number of photons entering the absorption layer of a battery can be increased; and therefore, the photoelectric conversion efficiency of the battery can be improved, and especially, the efficiency of the battery can be improved more significantly when sunlight obliquely enters the battery. A super hydrophobic film or a super hydrophilic film can be selected as the antireflection and self-cleaning thin film of the invention; since the super hydrophobic film has a high water contact angle, when the super hydrophobic film tilts, water droplets are very easy to roll down and take away surface pollutants, and therefore, a self-cleaning effect can be realized; and based on the photocatalysis, the super hydrophilic film can degrade surface organic contaminations, and therefore, a self-cleaning effect can be also realized.

The invention relates to a metal dielectric film reflection polarization beam splitting grating for a waveband of 1,053 nanometers, which is characterized in that the metal dielectric film reflection polarization beam splitting grating is formed in a mode that a silver layer, a high reflection film layer and a rectangular grating are plated on a quartz substrate sequentially; the rectangular grating has a period of 680.6 nanometers and a duty cycle of 0.2; a grating etching depth is in the range of 374 to 476 nanometers; the thickness of the silver layer is 100 nanometers; an intermediate layer of the high reflection film layer is a high refractive index layer; and inner and outer layers of the high reflection film layer are low refractive index layers. The metal dielectric film reflection polarization beam splitting grating disclosed by the invention has high extinction ratio and diffraction efficiency and wider bandwidth and angular width, can be used for a high-power laser system and has a good polarization beam splitting effect.

The invention discloses a graphene two-dimensional material protective layer-based topological insulator array photoelectric detector and a preparation method and application thereof. The method comprises the following preparation process of (1) growing a topological insulator film which is opposite to a substrate in doping type on the substrate; (2) obtaining a graphene two-dimensional material protective layer/PMMA stack structure by adopting a wetting transfer method and transferring the graphene two-dimensional material protective layer/PMMA stack structure to the topological insulator film; (3) preparing an ITO array electrode through photoetching and magnetron sputtering; and (4) etching away the topological insulator film between array elements of the ITO array electrode and a graphene two-dimensional material through photoetching and reactive ion etching to obtain the photoelectric detector. According to the method, a topological insulator can be effectively prevented from being in direct contact with an organic liquid to be damaged, the method can be compatible with a traditional micro-nano technology, the dimension of the unit detector is shortened, the integration level is improved, a wide spectrum and an ultra-fast photoelectric response are obtained and the method has a wide application prospect.

The invention discloses an LED-excited short wavelength infrared fluorescent microscopic imaging system. In the system, laser light emitted by a single-color LED passes through a collimating lens to be collimated firstly and is introduced into a light path of a microscope vertical illumination device, the exciting light is reflected with a dichroic beam combiner and converges onto a back focal plane of a microscopic objective, converging light forms parallel exciting light beams after passing through the objective and illuminates onto a sample, and a fluorescence probe in the sample is excitedto emit fluorescence; and a fluorescence signal passes through the objective, penetrates through the dichroic beam combiner and is finally received by a detection surface of an InGaAs camera to realize photoelectric conversion, and the signal is transmitted to a computer for data processing to obtain an imaged picture or a video. The LED-excited short wavelength infrared fluorescent microscopic imaging system has the remarkable advantages of high signal-to-noise ratio, high magnification, high resolution, capability of real-time imaging, capability of tomography, large penetration depth, small tissue damage and the like.

A trapezoid metal dielectric film broadband pulse compressed grating is characterized in that the grating is integrally formed through a matching layer and a trapezoid grating ridge, wherein the matching layer is composed of a quartz substrate, a metal layer and two layers of dielectric films, the trapezoid grating ridge is composed of three layers of dielectric films, and the outermost layer is made of SiO2. The cycle of the trapezoid grating is 490-640 nanometers, the duty ratio is 0.2-0.7, the base angle of the grating ridge is 60-89 degrees, the middle layer of the grating ridge is a high-refractive-index layer, and the inner layer and the outer layer of the grating ridge are low-refractive-index layers made of SiO2; the outer layer of the matching layer is a high-refractive-index layer, and the inner layer of the matching layer is a low-refractive-index layer; the thickness of the metal layer is larger than 50 nanometers. The trapezoid metal dielectric film broadband pulse compressed grating can be used as a pulse compressed grating of a high-power ultra-short pulse laser system with the central wavelength of 800 nanometers.

The invention discloses a method for preparing a PbSe quantum dot doped fiber material. The fiber material is prepared from the following raw materials in percentage by mass: 45 to 75 percent of SiO2, 3 to 10 percent of B2O3, 3 to 10 percent of Al2O3, 5 to 20 percent of ZnO, 1 to 7 percent of AlF3, 10 to 25 percent of Na2O, 0.5 to 5 percent of PbO, 0.5 to 5 percent of Se, and 0.5 to 2 percent of C. The PbSe quantum dot doped fiber material is prepared by the following steps of: weighing the raw materials in mass percentage, putting the raw materials into a ball mill, fully mixing the raw materials uniformly, putting the mixture into a closed crucible, melting the mixture for 30 minutes to 2 hours at the high temperature of between 1,100 and 1,450 DEG C, then quickly cooling the melt to obtain light brown grass, and finally performing a thermal treatment process to obtain the brown black PbSe quantum dot doped fiber material. The PbSe quantum dot doped fiber material prepared by the method has the characteristics of simple process, low price, controllable quantum dot size and the like.

The invention discloses a preparation method for high-density PbSe quantum dot silicate glass which is prepared from the following raw materials in percentage by weight: 45-70% of SiO2, 3-10% of B2O3, 3-10% of Al2O3, 5-20% of ZnO, 1-7% of AlF3, 10-25% of Na2O, 3-10% of PbO and 2-8% of ZnSe. The raw materials are weighed in percentage by weight; the raw materials are evenly mixed in a ball mill and then put in a sealed crucible; then, the mixture is molten at a high temperature of 1380-1600DEG C for 0.5-2 hours; a molten body is poured into a metal die and is quickly cooled in the air atmosphere to obtain yellow transparent glass; then, the yellow transparent glass is subjected to thermal treatment at the temperature of 500-650DEG C for 1-20 hours; the yellow transparent glass is taken out to be quickly cooled to the room temperature in the air to obtain black glass, namely the high-density PbSe quantum dot silicate glass. By utilizing the preparation method, the high-density PbSe quantum dot silicate glass can be obtained. The volume of the PbSe quantum dot in a glass matrix can be as high as 2-4% which is higher than a doping volume mass when Se is used as a selenium source.

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

A colorless light approaching that of white light in nature, is produced by using a blue color LEDs and a green color LED are covered with a red color phosphorescent glue and a yellow phosphorescent glue in separate layers or a mixed layer.

The invention belongs to the technical field of near-infrared light-emitting materials, particularly relates to a near-infrared light-emitting material, and further discloses a preparation method of the near-infrared light-emitting material and a light-emitting device containing the light-emitting material, wherein the near-infrared light-emitting material comprises an inorganic compound with a composition of MaAb(QO3)c:zZ, the excitation wavelength of the compound is 350-750nm, the emission main peak of the near-infrared region is broadband or multispectral emission at 700-1700 nm, the excitation wavelength is broad, and the compound can well absorb ultraviolet light, blue light and red light, has broadband or multispectral emission (700-1700 nm) in a near-infrared region, is adjustable and controllable in spectral range, has wide or more spectral line emission compared with red light with a peak wavelength of 700-1700 nm and near-infrared chips, and has wider application.

The invention discloses a preparation method of water-soluble nitrogen-doped carbon quantum dots, comprising the following steps: Step 1, dissolving citric acid in ultrapure water to prepare precursor solution I, dissolving p-aminobenzamide in Prepare precursor solution II in pure water, uniformly mix precursor solution I and precursor solution II at a volume ratio of 1 to 10:1 to obtain a mixed solution; step 2, perform hydrothermal reaction on the mixed solution prepared in step 1, Water-soluble nitrogen-doped carbon quantum dots can be obtained. The invention adopts a one-step hydrothermal method to prepare water-soluble nitrogen-doped carbon quantum dots. The carbon source is rich and cheap, the preparation process is simple, the whole preparation process is pollution-free, non-toxic, green and environmentally friendly, and can be prepared in large quantities.

An LED synchronous red-blue light panel light source used for promoting plant growth is composed of a high reflection panel, blue light LED light bars, a rare earth luminous panel, a light guiding board and an aluminum frame. The aluminum frame is a rectangular, the blue light LED light bars and the middle of the inner side face of the aluminum frame are fixed, the four side faces of the cuboid light guiding board, are connected with the blue light LED light bars around the cuboid light guiding board respectively, and the high reflection panel and the rare earth luminous panel adhere to the upper face and the lower face of the aluminum frame in a sealing mode. The LED synchronous red-blue light panel light source has the advantages that the structure is simple, implementation is easy, LED conversion is achieved from a traditional point light source to an area light source, the spectrum is wide, brightness is high, light colors are even, the capacity of damp and hot resistance is high, and service life is long; the full width at half maximum of an emitted red light peak is approximate to 70nm and is closer to red light in natural light, the irradiance proportion of red light and blue light is adjustable, coverage can be effectively performed on the absorption spectra of plants so that requirements of plant growth can be met, and the LED synchronous red-blue light panel light source can be widely applied to an intelligent plant factory and the fields of perpendicular planting, tissue culture seedling growth, home gardening and others.

The invention discloses a panchromatic Micro-LED array display and white light device based on III-nitride/organic semiconductor hybrid structure, which mixes inorganic and organic light emitting diode devices to obtain high-efficiency ultra-high-resolution active Micro-LED display and lighting source. A red-light, green-light or yellow-light organic material is evaporated on an N-type gallium nitride layer of a InxGa1-xN/gallium nitride quantum well blue-light LED epitaxial wafer having a p-n structure, respectively, and an electron transport layer, a luminescent layer, an exciton blocking layer, a hole transport layer and a hole injection layer are included in sequence; and when one of the groups of materials is evaporated, other pixels are shielded using a shielding mask. The technologycombines the organic semiconductor material and inorganic semiconductor material, and can realize a novel inorganic/organic semiconductor hybrid structure Micro-LED device array which has the characteristics of high efficiency, wide color gamut, low power consumption and fast response time.

The invention discloses a 360-degree complete cycle type LED lamp filament based on purple light chips. The 360-degree complete cycle type LED lamp filament based on the purple light chips is composed of a substrate, the chips, transparent silica gel, inorganic nanoparticles and phosphor gel; the phosphor gel is formed by organic silicon resin, multicolor phosphor and coupling agents through an injection moulding process, and is arranged on the outer side of the transparent silica gel. The chips are the purple light chips, the emission wavelength range is 360-410 nm, the chips are fixed to one face or the obverse side and the reverse side of the substrate, the inorganic nanoparticles are TiO2 or ZrO2, the particle size is 10-100 nm, the inorganic nanoparticles are distributed in the transparent silica gel, the multicolor phosphor is red, green and blue mixed phosphor of a phosphate or silicate system, and the coupling agents are silane coupling agents. The 360-degree complete cycle type LED lamp filament based on the purple light chips has the advantages of being high in color reduction degree, even and soft in light color, capable of emitting light by 360 degrees, high in light emitting efficiency, and the like.

A high energy femtosecond laser pulse outer cavity compression arrangement includes one laser amplifier system, thin lens, pulse compression unit, silvering concave mirror, silvering plane reflection mirror, dispersion compensating element, first broadband beam splitting piece, second broadband beam splitting piece, spectrograph, and pulse measurement instrument. It features said pulse compression unit consisting of solid material and vacuum tube, said solid material being used as vacuum tube back light piece and integrated forming, said vacuum tube side wall having inflation port. Said invented device can avoid damage to filter in high-energy pulse incidence state, suitable for large range energy femtosecond laser pulse compression, different wave band incident pulse, and linear polarization and circular polarization incident pulse.

The invention provides an indoor wide-spectrum wide-visual-angle condensation photovoltaic solar cell testing device which has the main function of testing III-V family condensation solar cells under different condensation multiples. The indoor wide-spectrum wide-visual-angle condensation photovoltaic solar cell testing device comprises an optical table, a simulated light source, a cell fixture and a testing system, wherein the simulated light source positioned on the optical table emits light rays; and the testing system measures the photovoltaic characteristic curve of the solar cell to be measured. The invention is characterized by also comprising a condensation system, wherein the condensation system comprises a condensation lens, a field lens and a collimating mirror which are sequentially arranged in an optical path; and the condensation system is used for condensing the light rays onto the solar cell to be measured. The invention has the advantages of stable simulated sunlight, adjustable light source intensity, wide spectrum, wide visual angle and many condensation multiples.