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

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 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.

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.