304results about How to "Reduce repetition rate" patented technology

A method for precise working of material, particularly organic tissue, comprises the step of providing laser pulses with a pulse length between 50 fs and 1 ps and with a pulse frequency from 50 kHz to 1 MHz and with a wavelength between 600 and 2000 nm for acting on the material to be worked. Apparatus, in accordance with the invention, for precise working of material, particularly organic tissue comprising a pulsed laser, wherein the laser has a pulse length between 50 fs and 1 ps and with a pulse frequency of from 50 kHz to 1 MHz is also described.

Dose uniformity of a scanning ion implanter is determined. A base beam current is measured at the beginning and/or the end of a complete scan over the whole substrate area. This base beam current is measured at a time when the measurement should be unaffected by outgassing from a substrate being implanted and a base dose distribution map is then calculated for the scan in question. During the scan itself beam instability events are detected and the magnitude and position in the scan of the detected instability events is measured. Corresponding deviations in the calculated base dose map are determined and subtracted from the previously calculated base dose distribution map to provide a corrected distribution map. By determining overall dose uniformity substractively in this way, good overall accuracy can be obtained with lesser accuracy in the measurement of the beam instability events.

An optical pulse source comprising a DPSS pump laser, a photonic crystal fiber (PCF), and acousto-optic modulator (AOM) gating device is disclosed. The pump pulses are coupled through lenses to the AOM gating device, which is synchronized to the pump laser and is operable to gate the pump pulses to a reduced repetition rate Rr=Rf/N, where Rf is the pump laser fundamental frequency. The pulses from the AOM are injected via optics into the PCF. Propagation through the PCF causes the pulses to broaden spectrally to produce optical supercontinuum pulses. An optical pulse source that further includes an acousto-optical tunable filter (AOTF) operable to convert the optical supercontinuum pulses into wavelength variable output pulses is also provided. A method of scaling the energy of the optical supercontinuum pulses is also disclosed.

The invention discloses a path planning algorithm of a mowing robot. The mowing robot comprises an electronic control device, a camera system and a GPS (Global Position System) positioning module, wherein the electronic control device is used for setting a processor, the processor is used for setting the path planning algorithm, and the path planning algorithm comprises the following steps of: 1, obtaining the position data of a charging seat, starting off by starting a mowing motor, searching a lawn natural boundary leftwards through the camera system, then walking forwards along the lawn natural boundary, and collecting forward images in real time; 2, obtaining the lawn natural boundary and positioning piles from the images by the processor, and walking forwards along a non-natural boundary formed by the natural boundary and the positioning piles until walking back to the position of the charging seat; 3, starting to search a mowing boundary by the mowing robot, starting to work along the mowing boundary, working towards the center of a lawn circle by circle; and 4, judging that the mowing task is finished when the mowing robot cannot find mowing boundary, shutting down the mowing motor, and walking back to the position of the charging seat.

A Personal Locator Beacon (PLB), supporting two operation modes local monitoring and remote monitoring. The apparatus includes a PLB that supports the present operation mode, as well as a local monitoring mode, employing the same transmitter, and automatically switching between modes. Upon activation, the PLB first tries to communicate with a local monitoring station, at a low transmission power, and at a high repetition rate, in purpose of dealing with the PLB call locally, without involving the remote monitoring station. Then, if not acknowledged by a local monitoring station, the PLB increases its transmission power, enabling access to a remote monitoring station. In a preferred embodiment, the PLB is carried by a person onboard a vessel, to alarm upon a Man Overboard (MOB) accident, the local monitoring station is installed onboard the same vessel, and the remote monitoring station is part of a satellite Search and Rescue (SAR) system, as Cospas-Sarsat.

Systems and methods employing Coherent Raman Scattering (CRS), e.g., Coherent anti-Stokes Raman Spectroscopy (CARS) and/or Stimulated Raman Scattering (SRS) are provided. Systems and methods for performing flow cytometry, imaging and sensing using low-resolution CRS are also provided.

The present invention provides compositions for bowel cleansing that have improved palatability through the inclusion of a sweetener, such as a chlorinated sucrose isomer. The invention also provides methods of reducing the saltiness of an orally consumed substance, including phosphate salt and PEG/salt bowel cleansers, through the use of a sweetener. Utilizing a sweetener including Sucralose to reduce the saltiness of a substance unexpectedly contradicts the conventional belief that sweeteners amplify saltiness.

System for converting relatively long pulses from rep-rate variable ultrafast optical sources to shorter, high-energy pulses suitable for sources in high-energy ultrafast lasers. Fibers with positive group velocity dispersion (GVD) and self phase modulation are advantageously employed with the optical sources. These systems take advantage of the need for higher pulse energies at lower repetition rates so that such sources can be cost effective.

The invention discloses a robot full-coverage path planning method and device based on a raster map as well as equipment. Firstly, the whole environment map is divided into multiple simple adjacent subareas, then, each subarea is traversed, and the repetition rate is very low while the coverage rate is high. Besides, in the traversal process, the walking state is changed in real time according topositioning information and map barrier information, and the method has the advantages of being simple, flexible and easy to implement. In addition, when a robot is in a cleaning area, the main running direction of the robot directly affects the turn times of paths. The main direction of the areas is used as the main running direction of the robot for traversing the cleaning paths, so that the turn times of paths is greatly reduced, and the traversal efficiency is improved.

The invention relates to a high-energy low-repetition-frequency fiber laser, which comprises a pump light source used for providing energy for generating laser light, a gain fiber used for providing gains, a mode locking device used for modulating the laser light so as to generate ultrashort pulses, and a single-mode transmission fiber used for laser transmission, wherein the gain fiber, the single-mode transmission fiber and the mode locking device form a resonant cavity of the fiber laser; the generated laser light is oscillated in the resonant cavity; and under the condition that the lengths of the gain fiber and the mode locking device are not increased, the length of the single-mode transmission fiber is increased according to a relation that the length L of the resonant cavity is inversely proportional to the repetition frequency frep of the fiber laser and according to the reduction of the needed repetition frequency frep. By increasing the length of the resonant cavity, the high-energy low-repetition-frequency fiber laser reduces the repetition frequency of pulses in the resonant cavity, correspondingly improves the energy of a single pulse, further simplifies the structure of an amplification system, improves the efficiency of an amplifier and effectively reduces the cost.

A new packaging method for a wide range of MEMS for application on both the wafer and device scale. Titanium is used as the packaging material and both silicon and titanium MEMS devices are integrated on to a titanium substrate. A Nd:YAG pulsed laser is used to micro-weld the titanium cap to the substrate. A three-dimensional time dependent model of heat flow during laser beam welding is presented. The heat transfer and parametric design capabilities of COMSOL were employed for this purpose. Model calculations are compared and calibrated with experimental results of pulsed laser welds. The functionality and hermiticity of the proposed packaging was evaluated by packaging a self actuated Veeco Instrument AFM cantilever tip. The experimental measurements show that the resonance frequency and quality factor of the device stay the same before and after packaging and the applied technique has no effect on the device.

The invention relates to a general file searching system which comprises: resource searching unit, results page formation unit, resource verification unit, resource database, resource regulation unit, searching database, indexing unit, feedback unit and resource update unit. The invention also relates to a general file searching method which is characterized in that: verifying validity of resources and regulating them, as well as searching media resource from internet; in all resources matched with key words, selecting the most effective, non-repeat resources and returning back to users, optimizing searching results via feedback units and removing invalid searching results.

The communication apparatus employing the non-coherent scheme is used in the UWB-impulse radio system. In order to make it possible to reliably realize long-distance communication, while observing the reference values of the average radiation power and the peak radiation power, and also to realize high-speed short-distance communication, the apparatus includes an impulse adjusting unit which adjusts, according to the distance between two communication apparatuses detected by the distance detecting unit, the amplitude and the repetition frequency of impulses used in radio communication between the two communication apparatuses.

An optical parametric oscillator (OPO) comprises a resonant cavity for signal light, and an optically non-linear medium disposed in the resonant cavity for converting pump light into the signal light, wherein the resonant cavity is arranged so that in operation signal light is repeatedly output from and returned to the optically non-linear medium along a signal light path in a continuously repeating cycle, and the OPO comprises delay means for extending the time taken for signal light output from the optically non-linear medium in operation to return to the optically non-linear medium along the signal light path.

An ear-plug alarm comprises a base station which sets the time, and ear-piece which provides autonomous timing and alarm functions after it is disconnected from the base station. The base station is implemented in personal computer software with an appropriate interface. Each ear-piece stores its own alarm setting, and operates autonomously after it is disconnected, so that a single base station can support any number of ear-pieces. With this method the alarm becomes a count down from the time that it is set, relieving the ear-piece timer of any long-term accuracy requirement.

The invention discloses a repeated data deleting method and device, and improves system reliability of a mobile intelligent terminal. The method comprises the steps of: carrying out matching on a data fingerprint of a current data block and data fingerprints in a hotspot hash table, and if a matching result is that the data fingerprint of the current data block is consistent with one data fingerprint in the hotspot hash table, determining the current data block as repeated data; and if a matching result is that the data fingerprint of the current data block is inconsistent with the data fingerprints in the hotspot hash table, carrying out matching on the data fingerprint of the current data block and data fingerprints in a hash fingerprint table, and when a matching result is that the data fingerprint of the current data block is consistent with one data fingerprint in the hash fingerprint table, determining the current data block as the repeated data, wherein the data fingerprint of each harsh table item in the hotspot hash table is a data fingerprint of which repeated times in at least one file reach a set threshold value, and the data fingerprints of the hash fingerprint table are stored data fingerprints of all the data blocks.

A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser and stretching into a few hundreds ps-10 ns pulse by a fiber stretcher for projecting into an acoustic-optic (AO) functioning as a pulse picker for generated a modulated laser with a reduced repetition rate for projecting to a multiple stage amplifier. The multiple stage amplifier further includes a first high-energy amplifier implemented with a large mode area (LMA) fiber for amplifying the modulated laser up to a uJ level laser and a second amplifier implemented with a PCF based Yb doped fiber to further amplify the uJ level laser to a mJ level laser.