126 results about "Transition radiation" patented technology

An optical device is provided comprising a gain section adapted to emit radiation at a radiation wavelength, a coupling section adjacent to the gain section for transitioning radiation between an active waveguide and a passive waveguide, and a passive section adjacent to the coupling section supporting a single-lobed optical mode in the passive waveguide at the radiation wavelength. The passive waveguide has an index of refraction and dimension such that the confinement of the radiation within the active waveguide in the gain section is reduced.

The invention provides a dual-wavelength Q-switched pulse fiber laser comprising a first laser pump source, a second laser pump source, a light beam combination device, a diachronic mirror, a coupling lens, a dual-cladding Er <3+>-doped ZBLAN fiber, a first collimating lens, a focusing lens, an equivalent saturable absorber, a second collimating lens, and a high reflector. The light beam combination device, the diachronic mirror, the coupling lens, the dual-cladding Er <3+>-doped ZBLAN fiber, the first collimating lens, the focusing lens, the equivalent saturable absorber, the second collimating lens, and the high reflector are connected in sequence. The first laser pump source and the second laser pump source are connected with the light beam combination device. The reflection wavelength of the high reflector is 3 to 5 microns. The high reflector and the front end surface of the dual-cladding Er <3+>-doped ZBLAN fiber form a laser resonance cavity; and in the dual-cladding Er <3+>-doped ZBLAN fiber, the energy level transition of the Er <3+> ion corresponds to transition radiation of the wavelength of 3.2 to 3.9 microns, thereby realizing output of high-power pulse laser with the wavelength larger than 3 microns. On the basis of the way, a problem that the traditional fiber laser uses a single wavelength pump source and thus laser with the wavelength larger than 3 microns can not be generated easily can be solved.

A compact system and method are provided for implementing the generation of electromagnetic radiation extending over mm-wavelength to sub-mm-wavelength or terahertz range. The generated electromagnetic radiation can be broadband or have a variable bandwidth. Electrons are accelerated to a chosen energy and undergo subsequent or simultaneous temporal or spatial compression. The degree of compression is chosen such that the electron beam pulse length is near to or less than that of the terahertz wavelength desired to be generated. The radiation is produced by one or combination of methods of synchrotron radiation or transition radiation.

The invention provides a medium deep charging potential and internal charging electric field acquisition method and a storage medium. The medium deep charging potential and internal charging electricfield acquisition method includes the steps: converting the orbit parameters into real-time coordinates in a geographic coordinate system by utilizing an MATLAB program according to the orbit parameters of each transfer section of the transfer orbit spacecraft, converting the real-time coordinates into real-time geomagnetic coordinates by utilizing a geomagnetic field mode IGRF, and substituting the real-time geomagnetic coordinates into a radiation band electronic environment model to obtain a real-time electronic environment energy spectrum; and taking the particle energy spectrum as an input condition, calculating the real-time particle deposition dose rate and the injection current density in the medium in particle transport simulation software Geant4, establishing a differential equation set to calculate the real-time electric field intensity and the charging potential in the medium, and identifying the deep discharge risk of the medium during satellite orbit transfer. According to the medium deep charging potential and internal charging electric field acquisition method, the medium deep charging potential and the internal charging electric field in the dynamic operation process of the transfer orbit spacecraft can be calculated, and the deep charging and discharging risk of the spacecraft when the spacecraft passes through the radiation band orbit and performs orbit transfer can be effectively evaluated.

The invention provides a praseodymium and ytterbium codope titanium dioxide up-conversion luminescent material, the chemical formula of which is as follows: TiO2:xPr3+, yYb3+, wherein x is more than or equal to 0.02 and less than or equal to 0.1, and y is more than or equal to 0.02 and less than or equal to 0.2. In the photoluminescence spectra of the praseodymium and ytterbium codope titanium dioxide up-conversion luminescent material, the excitation wave length of the praseodymium and ytterbium codope titanium dioxide up-conversion luminescent material is 980nm, and in 485nm wave length area, the glow peak is formed by the transition radiation of Pr3+ ion 3P0->3H4, thus being used as blue light luminescence materials. The invention also provides a preparation method of the praseodymium and ytterbium codope titanium dioxide up-conversion luminescent material, and an organic light emitting diode using the praseodymium and ytterbium codope titanium dioxide up-conversion luminescent material.

A praseodymium holmium co-doped niobate up-conversion luminescent material has the following chemical general formula of MeNbO3:xPr<3+>, yHo<3+>, wherein x is 0.01-0.08, y is 0.01-0.06, and Me is one of lithium, sodium, potassium, rubidium and cesium elements. In a photoluminescence spectrum of the praseodymium holmium co-doped niobate up-conversion luminescent material, the excitation wavelength of the praseodymium holmium co-doped niobate up-conversion luminescent material is 578 nm, in a wavelength region of 483 nm, luminescence peaks can be produced by transition radiation from <3>P0 to <3>H4 of Pr<3+> ions, and the praseodymium holmium co-doped niobate up-conversion luminescent material can be used as a blue light luminescent material. The invention also provides a preparation method of the praseodymium holmium co-doped niobate up-conversion luminescent material, and organic light-emitting diodes using the praseodymium holmium co-doped niobate up-conversion luminescent material.

The invention discloses upconversion fluorescent powder of a zirconium-gallium sulphide basal body and a preparation method of the upconversion fluorescent powder. The structural general formula of the fluorescent powder is aZrS-bGa2S3-cR2S: xPr3+ and yYb3+, wherein the aZrS-bGa2S3-cR2S is a substrate, and the Pr3+ and the Yb3+ are doping and activating elements which are used as luminous ion centers in films; the numerical value of a is in 0.57-0.8, the numerical value of b is in 0.12-0.3, the numerical value of c is in 0.03-0.06, the numerical value of x is 0.01-0.06, and the numerical value of y is 0.01-0.04. The upconversion fluorescent powder of the praseodymium-ytterbium co-doping zirconium-gallium sulphide basal body, prepared by the preparation method disclosed by the invention, can realize long-wave radiation excitation from infrared light to green light, and the emission peak of the obtained blue light of which the luminous wavelength is 483nm corresponds to transition radiation emission of Pr3+ ions 3P0 to 3H4.

The invention provides a neodymium-and-ytterbium-codoped alkaline earth fluoride glass up-conversion luminescent material. The chemical formula of the luminescent material is MeF2: xYb3+,yNd3+, wherein x is in a range of 0.005 to 0.05, y is in a range of 0.002 to 0.03, and Me is one selected from the group consisting of magnesium, calcium, strontium and barium. In the photoluminescence spectrum of the neodymium-and-ytterbium-codoped alkaline earth fluoride glass up-conversion luminescent material, the excitation wavelength of the neodymium-and-ytterbium-codoped alkaline earth fluoride glass up-conversion luminescent material is 586 nm, and in the wavelength zone of 469 nm, a luminescence peak is formed by transition radiation of Nd3+ ions from 2P3/2 to 4I15/2; and the material can be used as a blue-light luminescent material. The invention further provides a preparation method for the neodymium-and-ytterbium-codoped alkaline earth fluoride glass up-conversion luminescent material and an organic light-emitting diode using the neodymium-and-ytterbium-codoped alkaline earth fluoride glass up-conversion luminescent material.

Disclosed is a neodymium-ytterbium double-doped rare earth normal tantalate up-conversion luminescent material having a following general chemical formula of MeTaO4: xNd<3+>, yYb<3+>, wherein x is a number ranging from 0.01-0.08, y is a number ranging from 0-0.1 and Me is one of chemical elements of yttrium, lanthanum, gadolinium or lutecium. An excitation wavelength of the neodymium-ytterbium double-doped rare earth normal tantalate up-conversion luminescent material is 980nm in a photoluminescence spectrum of the neodymium-ytterbium double-doped rare earth normal tantalate up-conversion luminescent material, and a luminescent peak is formed by a <2>P<3/2> to <4>I<15/2> transition radiation transition radiation of Nd<3+> ions in a wavelength zone of 485nm. The material can be used as a blue light luminescent material. The invention also provides a preparation method for the neodymium-ytterbium double-doped rare earth normal tantalate up-conversion luminescent material, and an organic light-emitting diode using the neodymium-ytterbium double-doped rare earth normal tantalate up-conversion luminescent material.

The invention discloses a bipolar oscillator provided with a spacer. The bipolar oscillator provided with the spacer comprises two oscillator units in longitudinal symmetry. Each of the oscillator units comprises a triangular first radiation piece, a triangular hole is formed in the first radiation piece, the bottom edge of the first radiation piece extends to form a transition radiation plate perpendicular to the bottom edge, and the free end of the transition radiation plate is provided with a second radiation piece parallel to the bottom edge of first radiation piece. By means of the good structural design, good communication electrical parameter performance is achieved at the frequency band from 800MHZ to 950MHZ, specifically, the lowest frequency point front-to-rear ratio of a single radiation unit is larger than 30dB, the average frequency band front-to-rear ratio is larger than 32d, the low frequency point gain is larger than 9.37dBi, and the average frequency band gain is larger than 9.8dBi.

The invention provides a holmium-doped alkali columbate up-conversion luminescent material. The general chemical formula of the luminescent material is MeNbO3: xHo3+, wherein x is in a range of 0.01 to 0.06, and Me is one selected from the group consisting of lithium, sodium, potassium, rubidium and caesium. In the photoluminescence spectrum of the holmium-doped alkali columbate up-conversion luminescent material, the excitation wavelength of the holmium-doped alkali columbate up-conversion luminescent material is 640 nm, and a luminescence peak at 490 nm is formed by transition radiation of Ho3+ ions from 5F3 to 5I8. The invention further provides a preparation method for the holmium-doped alkali columbate up-conversion luminescent material and an organic light-emitting diode using the holmium-doped alkali columbate up-conversion luminescent material.

The invention discloses a Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material having a chemical formula of RS:xYb<3+>, yNd<3+>, wherein x is between 0.005 and 0.05, y is between 0.002 and 0.03, R is at least one of Mg, Ca, Sr and Ba. In the electroluminescence (EL) spectrum of the Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material, the excitation wavelength of the Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material is 586nm, a light emission peak is formed by transition radiation of Nd<3+> ion <2>P3/2-><4>I15/2 in a 469nm wavelength region, and therefore the Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material can be used as a blue light emitting material. The invention further provides a preparation method of the Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material and an organic light emitting diode using the Nd/Yb-codoped alkaline earth sulfide up-conversion luminescent material.

The invention discloses a praseodymium-holmium-codoped rare earth stannate up-conversion luminescent material. The praseodymium-holmium-codoped rare earth stannate up-conversion luminescent material has a chemical formula of Me2-x-ySnO5: xPr<3+>, yHo<3+>, wherein x is in a range of 0.002-0.06, y is in a range of 0.002-0.04, and Me represents a lithium element, a lanthanum element, a gadolinium element or a lutecium element. The praseodymium-holmium-codoped rare earth stannate up-conversion luminescent material can be stimulated by long-wave radiation from infrared light to green light, and in a 483nm wavelength zone, Pr<3+> ion 3P0 to 3H4 transition radiation forms a luminescence peak and thus the praseodymium-holmium-codoped rare earth stannate up-conversion luminescent material can be used as a blue-light emission material. The invention also provides a preparation method and use of the praseodymium-holmium-codoped rare earth stannate up-conversion luminescent material.

The invention belongs to the field of fluorescent powder, and discloses gadolinium oxide-based up-conversion luminescence fluorescent powder and a preparation method thereof. The fluorescent powder has a molecular formula of Gd2O3:xTb<3+>, yHo<3+>, wherein Tb<3+> is an active ion, and is used as a luminescence center of the material, Ho<3+> is a sensitized ion, and can absorb energy and transfer energy to the Tb<3+> ion, x ranges from 0.002 to 0.06, y ranges from 0.002 to 0.04. The gadolinium oxide-based up-conversion luminescence fluorescent powder of the invention belongs to terbium holmium codoped Gd2O3:xTb<3+>, yHo<3+> up-conversion fluorescent powder; the fluorescent powder can realize long-wave radiation excitation from infrared light to green light, and the obtained 485 nm luminescence peak corresponds to the 5D4-7H6 transition radiation luminescence of the Tb<3+> ion.

The invention relates to a neodymium-ytterbium-codoped zirconia up-conversion luminescent material which has a chemical formula of ZrO2:xYb<3+>,yNd<3+>, wherein x is more than or equal to 0.01 and less than or equal to 0.1, and y is more than or equal to 0.004 and less than or equal to 0.06. In a photoluminescence spectrum of the neodymium-ytterbium-codoped zirconia up-conversion luminescent material, the excitation wavelength of the neodymium-ytterbium-codoped zirconia up-conversion luminescent material is 586nm, a luminescent peak is formed by transition radiation of Nd<3+> ions 2P3/2->4I15/2 in a 469nm wavelength area, and the neodymium-ytterbium-codoped zirconia up-conversion luminescent material can be used as a blue light emitting material. The invention further provides a preparation method of the neodymium-ytterbium-codoped zirconia up-conversion luminescent material and an organic light-emitting diode using the neodymium-ytterbium-codoped zirconia up-conversion luminescent material.

The invention provides a side window type crossing radiation gas detector. The radiator of the detector is composed of a foil material and a gasket frame, the foil material is bonded to the gasket frame, and then all layers of foils are stacked together to form a regular radiator of a multi-layer structure formed by stacking materials with different dielectric constants; the gas detector comprisesa field cage, a double-layer thick gas electron multiplication membrane plate, an anode plate and a cavity, wherein the field cage is formed by splicing PCBs, the top surface of the interior of the field cage is a copper-clad cathode plate, copper bars are distributed on the side surface of the interior of the field cage at equal intervals, each layer of copper bars are connected through a fixed-value resistor, and the chamber and the anode plate are screwed up through screws to form a closed gas detector; the readout electronics system comprises a front end plate and a rear end data acquisition plate. The signals passing through radiation photons can be effectively distinguished, and energy calibration is carried out on high-energy charged particles. The gas detector has the advantages that large-area manufacturing is easy, the counting rate is high, and the spatial position resolution reaches the sub-millimeter level.

The invention relates to a dysprosium-doped alkaline earth boron aluminate up-conversion luminescent material with a chemical formula of aMO-bB2O3-cAl2O3:xDy<3+>, wherein x is 0.01-0.08, a is 0.2-0.5, b is 0.2-0.4, c is 0.1-0.5, and M is magnesium element, calcium element, strontium element or barium element. In the photo-luminescence spectrum of the dysprosium-doped alkaline earth boron aluminate up-conversion luminescent material, dysprosium-doped alkaline earth boron aluminate up-conversion luminescent material excitation wavelength is 796nm; in a 482nm wavelength zone, light emission peak is formed by Dy<3+> ion <4>F9/2 to <6>F15/2 transition radiation. The material can be used as a blue light emission material. The invention also provides a preparation method of the dysprosium-doped alkaline earth boron aluminate up-conversion luminescent material, and an organic light-emitting diode applying the material.

The invention discloses a holmium doped oxygen yttrium silicate up-conversion luminescent material, which is represented by a chemical formula: Me2Y8(SiO4)6O2:xHo3+, wherein x is in a range of 0.01 to 0.06, and Me represents a magnesium element, a calcium element, a strontium element, or a barium element. In the photoluminescence spectrum of the holmium doped oxygen yttrium silicate up-conversion luminescent material, the material can achieve long wave radiation excitation from the infrared to the green light, and the luminescence peak at 490 nm is corresponding to the luminescence peak formed by the transition radiation of Ho3+ ions from 5F3 to 5I8. The invention also provides a preparation method of the up-conversion luminescent material, and an organic light emitting diode using the up-conversion luminescent material.

The invention provides a praseodymium and ytterbium codope gadolinium oxide up-conversion luminescent material, the chemical formula of which is as follows: Gd2O3: xTb3+, yYb3+, wherein x is more than or equal to 0.01 and less than or equal to 0.05, and y is more than or equal to 0.01 and less than or equal to 0.1. In the photoluminescence spectra of the praseodymium and ytterbium codope gadolinium oxide up-conversion luminescent material, the excitation wave length of the praseodymium and ytterbium codope gadolinium oxide up-conversion luminescent material is 980nm, and in 485nm wave length area, glow peak is formed by the transition radiation of Tb3+ ion 5D4->7H6, thus being used as blue light luminescence materials. The invention also provides a preparation method of the praseodymium and ytterbium codope gadolinium oxide up-conversion luminescent material, and an organic light emitting diode using the praseodymium and ytterbium codope gadolinium oxide up-conversion luminescent material.

The invention relates to a holmium-doped yttrium oxysulfide up-conversion luminescent material which has a chemical formula of Y2O2S:xHo<3+>, wherein x is more than or equal to 0.01 and less than or equal to 0.05. In a photoluminescence spectrum of the holmium-doped yttrium oxysulfide up-conversion luminescent material, the excitation wavelength of the holmium-doped yttrium oxysulfide up-conversion luminescent material is 640nm, a luminescent peak is formed by transition radiation of Ho<3+> ions 5F3->5I8 in a 490nm wavelength area, and the holmium-doped yttrium oxysulfide up-conversion luminescent material can be used as a blue light emitting material. The invention further provides a preparation method of the holmium-doped yttrium oxysulfide up-conversion luminescent material and an organic light-emitting diode using the holmium-doped yttrium oxysulfide up-conversion luminescent material.