47results about How to "High gain factor" patented technology

The invention provides a monolithically integrated electrical pumping bragg reflection waveguide terahertz laser device, belongs to the field of photoelectric devices, and aims at solving the problems in existing terahertz laser output. According to the laser device, a bragg reflection waveguide structure is adopted in the vertical direction; the laser device comprises two adjacent distributed bragg reflection laser devices, a Y-waveguide beam coupler, a laser power amplifier and a passive bragg reflection waveguide nonlinear frequency conversion part, wherein the rear cavity surfaces of the two distributed bragg reflection laser devices are used for etching distributed bragg gratings which are slightly different in cycle and duty ratio respectively, so that a certain difference is formed between the output wavelengths of the two laser devices; two input ends of one side of the Y-waveguide beam coupler are respectively connected with the two laser devices; the other ends are coupled to output dual-wavelength laser; the laser power amplifier is connected with an output end of a Y waveguide and is used for carrying out power amplification on the injected dual-wavelength laser; and the passive bragg reflection waveguide nonlinear frequency conversion part is connected with the output end of the laser power amplifier, so that a difference frequency 1 / lambda1-1 / lambda2=1 / lambda3 is generated by the injected laser with two different wavelengths lambda1 and lambda2, thereby realizing output of the terahertz laser lambda3.

The device includes following parts: a semiconductor substrate; a device layer formed on the semiconductor substrate; a shielding layer formed on the device layer; and an interconnection layer formed on the shielding layer. The manufacturing method includes steps: providing a semiconductor substrate; forming a device layer on the semiconductor substrate; forming an insulating layer on the device layer; forming a shielding layer on the insulating layer; forming connection holes between the shielding layer and the insulating layer; forming an interconnection layer on the shielding layer. The shielding layer shields influence on transistor from electromagnetic radiation generated by the interconnection layer, and makes testing semiconductor device simple, and accurate.

The invention discloses ytterbium doped fluorphosphate glass with a long fluorescent life and a preparation method of the glass. The glass comprises the following components by mole percentage: 10-20mol% of P2O5, 25-35mol% of AlF3, 20-35mol% of CaF2, 10-15mol% of RF and 7-25mol% of R'F2, wherein a sum of the percentage of the components is 100mol%; additional 3wt% of Yb2O3 is doped according to a weight ratio; R is Li<+>, Na<+> or K<+>; and R' is Mg<2+>, Sr<2+>, Ba<2+> or Zn<2+>. The preparation method of the glass comprises the following steps that raw materials are weighed according to the formula in a glove box, mixed uniformly, and added to a graphite crucible; carbon tetrachloride is added to the crucible, and heated to 900-1100 DEG C by a high frequency furnace and kept for 45min; finally, the high frequency furnace is turned off; the temperature falls to a room temperature rapidly; and the glass is taken out and placed in a muffle furnace for annealing. The glass has better gain performance; the fluorescent life reaches as high as 2.25ms; an emission cross section is 0.8pm<2>; a gain coefficient is 1.8ms*pm<2>; and a hydroxy absorption coefficient alphaOH is less than 0.3cm<-1>.

The invention relates to a Bragg reflection waveguide double-beam laser which sequentially comprises an N-plane electrode, a substrate, a buffer layer, a lower waveguide layer, a defective layer, an upper waveguide layer, a cover layer and a P-plane electrode from bottom to top. An active region is arranged in the defective layer; the lower waveguide layer comprises a plurality of pairs of Bragg reflectors formed in a mode that N-type doped high and low refractive index material layers periodically and alternately grow; the upper waveguide layer comprises a plurality of pairs of Bragg reflectors formed in a mode that P-type doped high and low refractive index material layers periodically and alternately grow; and the effective refractive index of a guided mode is lower than those of the P-type doped low refractive index material layers and the N-type doped low refractive index material layers. The Bragg reflection waveguide double-beam laser disclosed by the invention can directly output two beams of stable laser with low transversal divergence, separated angles between the double beams and controllable power symmetry and has wide application prospect in the fields of high-speed laser scanning, high-precision laser detection, laser processing, an off-axis outer cavity, coherent coupling and the like.

The invention relates to a high-power narrow-linewidth fiber laser based on rayleigh scattering and a working method thereof. The laser comprises a pump laser, a wavelength division multiplexer, a YAG-SiO2 doped fiber, a first fiber circulator, a polarization controller, a second fiber circulator, a YAG-SiO2 fiber, a variable optical attenuator and a faraday rotation mirror which are arranged along the light path. The first fiber circulator is also connected with high-reflectivity fiber Bragg gratings. The output end of the first fiber circulator is also connected with a fiber coupler. One output end of the fiber coupler is connected with the wavelength division multiplexer. The other output end of the fiber coupler is the output end of the whole laser. The wavelength division multiplexer,the YAG-SiO2 doped fiber, the first fiber circulator, the polarization controller, the second fiber circulator and the fiber coupler form a ring cavity together.

The invention discloses ytterbium-doped fluorphosphate glass with a large emission section and a preparation method of the ytterbium-doped fluorphosphate glass. The ytterbium-doped fluorphosphate glass comprises the following components: 4-10mol% of BaO, 1-5mol% of Al2O3, 10-20mol% of P2O5, 15-25mol% of ZrF4, 12-15mol% of SrF2, 13-18mol% of BaF2 and 15-20mol% of PbF2; the total molar percentage of the components is 100mol%; and Yb2O3 is doped at 1wt%. 5-10mol% of CaF2, 5-10mol% of TeO2, 5-10mol% of Bi2O3 or 5-10mol% of Nb2O5 are added into the components of the glass. The preparation method comprises the following steps of weighing raw materials according to a formula, mixing fully and uniformly, adding to a graphite crucible, using a high frequency furnace to heat to 900-1000 DEG C quickly, keeping warm for 30min, cooling, taking out the glass, placing the glass in a muffle furnace which is heated to glass transition temperature of the glass, keeping warm for 4h, and annealing to the room temperature at a cooling rate of 10 DEG C / h. The glass has a better grain property, and the stimulated emission section is 1.29pm<2>.

The invention discloses an optical fiber vibration detection system and an optical fiber vibration detection method. An optical fiber vibration sensor is connected with a host computer, the optical fiber vibration sensor comprises a first circulator, N pumping light sources, and a first wavelength division multiplexer, the first circulator is connected with the first wavelength division multiplexer, the N pumping light sources are connected with the first wavelength division multiplexer, the first wavelength division multiplexer is connected to a remote gain module via a first sensing optical fiber, and the remote gain module is also connected with a second sensing optical fiber. Signal light emitted by the first circulator and pumping light emitted by the N pumping light sources enter the remote gain module via the first wavelength division multiplexer, and the pumping light is downloaded via the remote gain module for the amplification of the signal light. Therefore, the technical problem that the actual production requirement cannot be satisfied due to limited detection distance of the optical fiber vibration signal detection system is solved, and the accuracy of remote optical fiber vibration detection is improved.

The invention discloses a voltage gain adjusting device of a chain type SVG (static var generator) controller and a control method. A full-controlled converter device is adopted, the power grid voltage signal variation quantity is taken as the controlled quantity, a voltage gain adjusting signal is obtained by processing the power grid voltage signal variation quantity by an acquisition module, a filter, a phase corrector, a digital signal processor, a gain controller and a PID (proportion integration differentiation) controller, and an SVG outputs an instruction current. According to the voltage gain adjusting device, output control signals of the controller are adjusted according to a nonlinear model of an SVG electric power system, an inverter circuit is accurately controlled, higher gain coefficients are provided for large signals, low gain is provided for small signals, the response speed is high, the tracking precision is high, the stability and the reliability of a power grid can be greatly improved, and efficient operation of the whole power grid is guaranteed.

An image sharpening method and device according to an embodiment of the present invention includes: converting an image frame to be sharpened from an RGB color space to a YUV color space, and performing Gaussian low-pass filtering on a Y luminance component to obtain a Y luminance low-pass component, Calculate the difference between the Y luminance component and the Y luminance low-pass component to obtain the Y luminance high-frequency component; filter the Y luminance component according to the preset filtering operator to obtain the Y luminance image background; calculate the Y luminance according to the preset gradient operator The image gradient map of the component, and the image texture map of the Y brightness component is obtained according to the image gradient map; according to the Y brightness image background and the Y brightness image texture map, the Y brightness minimum perceptible difference image is calculated; based on the Y brightness minimum perceptible difference image and Y luminance high-frequency components, calculate the gain coefficient; calculate the sharpened image according to the gain coefficient. The image sharpening method of the present invention can enhance image details and avoid noise enhancement; the obtained gain coefficient is more in line with the visual characteristics of human eyes.

A short wavelength AlGaInP red light semiconductor laser structurally comprises a substrate, a lower buffer layer, a lower limiting layer, a lower waveguide layer, a quantum well layer, an upper waveguide layer, an upper limiting layer, an upper buffer layer and an ohmic contact layer in sequence from the bottom to the top; the lower buffer layer is an AlxIn1-xP component gradual change layer, and x linearly gradually changes to 0.6 from 0.5; the upper buffer layer is an AlyIn1-yP component gradual change layer, and y linearly gradually changes to 0.5 from 0.6; the upper waveguide layer and lower waveguide layer are both (AlzGa1-z)0.6In0.4P; the lower limiting layer and upper limiting layer are both Al0.6In0.4P. By the AlInP component gradual change buffer layer, an In component of the limiting layers and the waveguide layers is reduced to 0.4, the refraction index of a material of the limiting layers is reduced, a bandgap of a material of the waveguide layers is increased, photons and carriers are better limited, and meanwhile, the quantum well layer can obtain short wavelength light of 590-620nm under a lower strain condition.

The invention discloses an optical fiber of a stimulated Brillouin scattering effect enhancement type, and the optical fiber comprises a fiber core and a wrapping layer surrounding the fiber core. The radius a of the fiber core is from 1 [mu]m to 7 [mu]m, and the fiber core is doped with one of GeO2, P2O, and Al2O3. The wrapping layer is doped with a material F. The relation between the refractive index difference delta n between the fiber core and the wrapping layer and the radius a of the fiber meets the conditions: a*a*delta n is greater than zero and not greater than 0120 [mu]m[2]. The relation between the sound speed difference delta V1 between the fiber core and the wrapping layer and the radius a of the fiber meets the conditions: a*a*delta V1 is greater than zero and not greater than 225 [mu]m[2]*m / s, so as to excite and generate single optical mode and single sound mode constraint stably in the optical fiber at the same time. The fiber core and the wrapping layer are respectively doped with different materials, thereby obtaining the common excitation of an acousto-optic field. A single brillouin gain peak is formed in the optical fiber through coupling. The position of the gain peak of a gain spectrum of the optical fiber is higher in gain coefficient, and the full width at half maximum of a brillouin gain spectrum is narrower and is about 10 MHz. Moreover, the optical fiber also can improve an absolute value of a chromatic dispersion parameter while enhancing the stimulated Brillouin scattering effect, and effectively inhibits an four-wave mixing effect nearby a normally-used working band window 1.55 [mu]m.

The invention is a novel doped rare earth ion Nd 3+ Transparent vanadate glass series: V 2 o 5 -SiO 2 -MO(CaO+BaO+SrO)-X 2 O(Na 2 O+K 2 O+Cs 2 O)-Nd 2 o 3 . Doped with Nd 3+ Compared with this type of glass, various types of substrates have the highest gain coefficient and good optical properties, and are excellent candidates for laser beam amplification. It is expected that the ultra-strong laser system in high-energy nuclear fusion simulation experiments will achieve its physical indicators and reduce system costs. , Improve system efficiency.