230results about How to "High output power" patented technology

An apparatus generates femtosecond pulses from laser amplifiers by nonlinear frequency conversion. The implementation of nonlinear frequency-conversion allows the design of highly nonlinear amplifiers at a signal wavelength (SW), while still preserving a high-quality pulse at an approximately frequency-doubled wavelength (FDW). Nonlinear frequency-conversion also allows for limited wavelength tuning of the FDW. As an example, the output from a nonlinear fiber amplifier is frequency-converted. By controlling the polarization state in the nonlinear fiber amplifier and by operating in the soliton-supporting dispersion regime of the host glass, an efficient nonlinear pulse compression for the SW is obtained. The generated pulse width is optimized by utilizing soliton compression in the presence of the Raman-self-frequency shift in the nonlinear fiber amplifier at the SW. High-power pulses are obtained by employing fiber amplifiers with large core-diameters. The efficiency of the nonlinear fiber amplifier is optimized by using a double clad fiber (i.e., a fiber with a double-step refractive index profile) and by pumping light directly into the inner core of this fiber. Periodically poled LiNbO3 (PPLN) is used for efficient conversion of the SW to a FDW. The quality of the pulses at the FDW can further be improved by nonlinear frequency conversion of the compressed and Raman-shifted signal pulses at the SW. The use of Raman-shifting further increases the tuning range at the FDW. For applications in confocal microscopy, a special linear fiber amplifier is used.

A switching control circuit having detection terminal, input terminal, ramp generator, program terminal, error amplifier, mix circuit, and delay circuit for power factor control is provided. The detection terminal generates a detection signal in response to the inductor discharge. An input terminal is connected for detecting a switching current signal. The program terminal determines the slew rate of the ramp signal and the maximum on-time of the switching signal. An error amplifier generates an error signal for regulating the output. A mix circuit generates a mixing signal proportional to ramp signal and the switching current signal. The switching signal is turned on in response to the detection signal, and is turned off based on the error signal. The slew rate of the mixing signal is increased in response to the increase of the input voltage. The on-time of the switching signal is increased inversely proportional to the input voltage.

A grating-outcoupled microcavity disk resonator has whispering gallery modes existing in a nearly circular resonator. Light is outcoupled by providing a grating region in the plane of the grating-outcoupled microcavity disk resonator. The grating region provides an outcoupling or lass mechanism that symmetrically interacts with the clockwise and counterclockwise whispering gallery modes, thereby making the resonator capable of surface emission.

An ocean wave energy system for generating power from ocean waves includes a platform supporting an array of hollow columns whose respective lower ends are in fluidic communication with ocean waves and whose respective upper ends are in air communication with a turbine arrangement such that wave motion occurring at the lower ends is operable to cause air movement within the columns for propelling the turbine arrangement to generate power output. The system further includes one or more position-adjustable and/or angle-adjustable submerged structures near the lower ends of the columns for forming ocean waves propagating in operation towards the lower ends of the columns to couple the waves in a controllable manner into the hollow columns.

A self-power magnetic current changing intelligent vibration damping system consists of electromagnetic adjustable magnetic current changing damper, rack gear accelerator and permanent magnet DC generator, the piston rod of said damper is fixed and connected with the racks of accelerator, and the final pinion of accelerator is installed on said DC generator axle, the outlet end of the DC generator is connected with the electromagnetic coil receiving terminal of said damper, and controller is installed between the outlet end of said DC generator and the electromagnetic coil receiving terminal of the damper. The kernel technology of the invention is: it integrates the sensor of structure vibration and the power-supply source of magnetic current changing damper on small-sized permanent magnet DC generator. The invention applies to the vibration damping of civil engineering structure, it can realize semi-active real-time control without extraneous power source, reduce the system cost, and it is reliable, stable, simple and practical and has obvious self-adaptive characteristics.

An electric power steering removes external wiring connecting between an electric motor and a control unit, whereby the influence of radiation noise caused by a PWM operation can be reduced. In addition, the heat radiation and assemblability of the electric motor and the control unit can be improved, while achieving high power output. A housing 64 with a metal substrate 61 fixedly secured thereto is arranged at a side opposite to an electric motor 30. The cooling fins are formed on an outer side of a housing 64 and on an outer side and an inner side of a cover 65. A metal substrate 61, a large current substrate 62 and a control substrate 63 are arranged inside of the housing 64 and the cover 65 in a laminated structure.

A fluorescence observing apparatus including a light source for emitting excitation light, an excitation light irradiation section for irradiating the excitation light to a sample, and a fluorescence measurement section for measuring fluorescence emitted from the sample by the irradiation of the excitation light. In the fluorescence observing apparatus, a GaN semiconductor laser is employed as the light source.

The invention discloses a bending-twisting conversion type ultrasonic torsion vibration transducer which comprises a bending-twisting vibrating body(1), a drive component (2) and a back cover (3) of the transducer; the drive component (2) is arranged between the bending-twisting vibrating body(1) and the back cover (3) of the transducer, and moreover, an A pretighting bolt (33) passes through the through hole of an A end cover (31), an A through hole (22) and an A pretighting screw hole (121) in turn through to arrange the A end cover (31) and an insulating block (21) on the A top surface (107) of the bending-twisting vibrating body(1); an B pretighting bolt (34) passes through the through hole of an B end cover (32), an B through hole (23) and an B pretighting screw hole (151) in turn to arrange the B end cover (32) and the insulating block (21) on the B top surface (108) of the bending-twisting vibrating body(1). A pair of bending vibrations with the same frequency swings and opposite vibrating directions generated by corresponding two groups of piezoelectric ceramics drive elements are amplified and transmitted to a converter by two bending arms; two bending vibrations are coupled and converted into a coupling torsion vibration (63) through a mode converter; a torsion vibration (64) is obtained and output after being amplified by an amplitude transformer (101), thus obtaining ultrasonic torsion vibration by a simpler mode.

A method for printing an image on a printing substrate, a number of portions of fluid printing ink being produced on a printing ink carrier (10) through energy input by a number of image spots (810) of an array (84) of individually controllable VCSEL light sources, and the fluid printing ink being transferred to the printing substrate. A device for inputting energy (80) to a printing-ink carrier (10), includes a number (82) of individually controllable laser light sources which have a modular design consisting of subarrays (86) and are disposed in an array (84), and further includes printing-ink carrier (10) with which is associated an axis of rotation (88) and on the surface of which can be produced a number of image spots (810) of the laser light sources. The subarrays of laser light sources are VCSEL bars (84), and rows of image spots (12) of the VCSEL bars are inclined with respect to the axis of rotation (88).

A semiconductor body includes, on a substrate, a stack of buffer layer, UID-GaN layer overlying the buffer layer, and UID-AlGaN layer overlying the UID-GaN layer. On the surface of the UID-AlGaN layer, an insulation film is deposited and patterned. An n⁺-GaN layer is selectively regrown directly on a region of the surface of the semiconductor body other than the insulation film using the patterned insulation film as a mask without etching the surface of the semiconductor body. A portion of the selectively regrown n⁺-GaN layer corresponding to a region reserved for an ohmic contact electrode is defined and the ohmic contact electrode is formed on the region. An opening exposing a region reserved for a gate electrode is defined and formed within the insulation SiO₂ layer, and a gate electrode is formed in the region. An AlGaN/GaN-HEMT or MIS type of AlGaN/GaN-HEMT has lower contact resistance and uniform device characteristics.

This disclosure discusses techniques for obtaining wavelength selected simultaneously super pulsed Q-switched and cavity dumped laser pulses utilizing high optical damage threshold electro-optic modulators, maintaining a zero DC voltage bias on the CdTe electro-optic modulator (EOM) so as to minimize polarization variations depending on the location of the laser beam propagating through the CdSe EOM crystal, as well as the addition of one or more laser amplifiers in a compact package and the use of simultaneous gain switched, Q-switched and cavity dumped operation of CO₂ lasers for generating shorter pulses and higher peak power for the hole drilling, engraving and perforation applications.

An electric fluid pump includes an upper housing having a fluid inlet and outlet. An impeller is seated within the upper housing for pumping fluid between the inlet and the outlet. The impeller includes at least one magnet secured thereto. A lower housing mates with the upper housing. The lower housing has an upper wall for closing the upper housing and a shaft extending from the upper wall for rotatably supporting the impeller. A stator is seated within the lower housing and spaced from the impeller by the upper wall. The stator includes a plurality of pillars supporting a winding of coils for producing a magnetic field to energize the magnet and rotate the impeller, and a plurality of top plates covering each of the coils and spaced apart by a predetermined gap for maintaining the magnetic field between the stator and the impeller. An end cap closes the stator within the lower housing.

The present invention relates to methods for modulating a semiconductor laser and wavelength matching to a wavelength converter using monolithic micro-heaters integrated in the semiconductor laser. The present invention also relates to wavelength matching and stabilization in laser sources in general, without regard to whether the laser is modulated or whether second harmonic generation is utilized in the laser source. According to one embodiment of the present invention, a method of compensating for thermally induced patterning effects in a semiconductor laser is provided where the laser's heating element driving current I_H is set to a relatively high magnitude when the laser's driving current I_D is at a relatively low magnitude. Additional embodiments are disclosed and claimed.

A post-distortion method for cascading amplifier stages in a two-stage microwave power amplifier and a dynamic biasing method using back-end processing for correcting nonlinearity in the power amplifier output. A first or driver stage biased in a near-A region with low distortion is cascaded with a second or power stage biased in a near-C region with high efficiency. The amplitude and phase responses of the two stages compensate another to yield a more linear overall gain for the overall power amplifier. The dynamic biasing scheme modulates the source to drain voltages of the transistors used in the amplifier stages based on the harmonics in amplifier output in order to minimize the harmonics and correct non-linearity in the output.

A laser annealer has a laser light source with at least one GaN-type semiconductor laser and is configured so as to form emission points that emit laser beams having a wavelength of 350 to 450 nm, and a scanning device for scanning an annealing surface with the laser beams. The laser annealer may have a spatial light modulator for modulating the laser beams, and in which pixel portions whose light modulating states change in accordance with control signals are arranged on a substrate. The invention is applied to a laser thin-film forming apparatus. The apparatus has a laser source that has at least one semiconductor laser and is configured so as to form emission points, and an optical system for focusing laser beams into a single beam in the width direction of a substrate.

The invention is directed to intermetallic compounds for use as catalysts for chemical reactions and catalytic systems. The structure of ordered intermetallic compounds enables such compounds to function as highly efficient catalysts. The ordered intermetallic compounds may be used to catalyze reactions in fuel cells (e.g., hydrogen fuel cells), amongst numerous other applications.

A manufacturing method of white light LED and a structure thereof include first, a substrate being prepared to be formed as a consecutively connected holder, on a first electrode of which non-conductive fluorescent glue is coated to form a fluorescent layer, on which a blue light chip is fixed; second, two conducting wires being welded onto the chip and electrically connected to both the first electrode and the second electrode of the holder respectively, finally, glue body encapsulating the holder, the fluorescent layer, the chip, and the two conducting wires to form a photic zone, over which a frame body encloses; furthermore, a window being formed on the frame body and provided for making the photic zone exposed. When blue light chip is excited to generate blue light, which will further excite the fluorescent layer to emit yellow light, then both blue light and yellow light will be dispersed through the photic zone to generate a uniform light source, which may output light longitudinally and collectively, making the output power promoted notably and the lightness enhanced significantly.

Electronic circuitry for high-power, high-frequency excitation of electromagnetic acoustic transducers (EMAT) without the use of a matching transformer is described. This circuit contains a least 4 switching devices such as power Mosfet transistors, arranged in an H-Bridge configuration that are designed to drive various EMATs over a wide range of frequencies. The switching devices can be connected in parallel with respect to the H-Bridge and switched in sequence for greater power output and variety of wave forms. This circuit configuration can provide a many excitation waveforms including, Churp, Hemming window tone burst, rectangular tone burst and Barker Code wave forms.

An improved electronic pulser circuit based on the H-bridge topology is designed for driving the sensor coils of an electromagnetic acoustic transducer (EMAT) to correct the disadvantages of conventional H-bridge pulsers and pulsers that require the use of an output transformer. A plurality of switching devices, primarily power Mosfets, are connected in parallel and augmented with support circuitry to provide improved performance in terms of increased power output, stability, reduced noise and complex output wave forms. This improved design provides for the application of modulated pulses such as multi-pulse, multi-frequency tone bursts of peak power outputs in excess of 20 thousand watts and frequencies in excess of 10 thousand Hertz.

The invention discloses a method for estimating the available power of a vehicle power battery, and the method comprises the steps: obtaining the data; obtaining an actual charge state of the power battery, and collecting the maximum temperature and minimum temperature of the power battery in the actual charge state; obtaining a corresponding available power when the actual charge state is the same as a preset charge state and the preset temperature is equal to the maximum temperature, and defining the available power as first available power; obtaining a corresponding available power when theactual charge state is the same as a preset charge state and the preset temperature is equal to the minimum temperature, and defining the available power as second available power; taking the power with the smaller absolute value in the first and second available power as an available power basic value, multiplying the available power basic value by a dynamic correcting factor f, and obtaining the available power of the power battery. The method can effectively prevent the sharp drop of a voltage from triggering battery protection and remarkably reducing the output power.

A wafer for semiconductor device fabrication, from which large output power can be obtained by making the off-state breakdown voltage higher than in the prior art. The wafer for semiconductor device fabrication comprises a substrate, GaN electron transit layer formed on the side of the principal surface of the substrate, and AlGaN electron supply layer formed on the electron transit layer. The thickness of the electron transit layer is from 0.2 to 0.9 μm.