16results about How to "High peak power" patented technology

The invention relates to the technical field of laser control, and discloses a 920nm femtosecond pulse fiber laser system based on a neodymium-doped fiber. The system comprises a seed laser source system, a pre-chirp system, an amplification system and a compression system, the output end of the seed laser source system is connected with the input end of the pre-chirp system, the output end of the pre-chirp system is connected with the input end of the amplification system, and the output end of the amplification system is connected with the input end of the compression system. Through a pre-chirp management method, the seed pulse can simultaneously realize the improvement of the pulse energy and the violent broadening of the spectrum in the amplification process. And a wider spectrum can obtain a narrower pulse width after being subjected to time domain compression. The narrower the width of the pulse means that the energy is more concentrated, so that the peak power of the laser pulse output after compression is higher, and the problem that narrow pulse width and high energy output cannot be simultaneously realized in the 920nm wave band in the existing fiber laser technology is solved.

The invention relates to a preparation method of a membrane electrode suitable for a low-humidity working condition, which comprises the following steps: (1) dissolving an ionic liquid in ultrapure water, and uniformly dispersing to obtain an ionic liquid aqueous solution; (2) uniformly mixing the ionic liquid aqueous solution obtained in the step (1) with a catalyst, coating the surface of the catalyst with the ionic liquid, and cleaning and drying the coated catalyst to obtain an ionic liquid coated catalyst; (3) uniformly mixing the ionic liquid coated catalyst obtained in the step (2) with an ionomer and a dispersing solvent, preparing catalyst slurry, and spraying to prepare a cathode catalyst layer; and (4) hot-pressing the cathode catalyst layer and the anode catalyst layer obtained in the step (3) to two sides of a proton exchange membrane to prepare the membrane electrode. Compared with the prior art, the membrane electrode disclosed by the invention can ensure high-efficiency transmission of protons in the catalyst layer under a low-humidity working condition, so that wide-working-condition operation is realized; meanwhile, oxygen mass transfer is enhanced, and the battery performance under high current density is improved.

The invention discloses an active and passive mode locking combined femtosecond disc laser, and belongs to the field of disc laser. The femtosecond disc laser comprises a pumping source, a pumping cavity, a disc laser crystal and a resonant cavity, pumping laser emitted by the pumping source is reflected for multiple times in the pumping cavity and passes through the disc laser crystal for multiple times to generate oscillation laser; the resonant cavity comprises a first branch and a second branch, the first branch comprises a dispersion mirror group, a hard diaphragm and an output mirror which are sequentially arranged along a light path, and the second branch comprises a first concave mirror, a second concave mirror, a first high-reflection mirror, a third concave mirror, an acousto-optic modulator and a second high-reflection mirror which are sequentially arranged along the light path; the acousto-optic modulator is located at the focal point of the third concave mirror, and modulates periodic loss and starts passive mode locking in the active mode locking process; oscillation laser generates a femtosecond laser pulse sequence after passing through the acousto-optic modulator, the femtosecond laser pulse sequence is reflected to return to the disc laser crystal along the original path and enters the first branch, and the femtosecond laser pulse sequence is output through the output mirror.

The invention discloses a non-contact welding method for diamond and quartz glass. The non-contact welding method comprises the steps that a diamond composite sheet and a quartz glass sheet are subjected to ultrasonic cleaning and blow-drying; naturally stacking the quartz glass sheets on the diamond compact to form non-contact assembly; transmitting femtosecond laser, focusing the femtosecond laser on the interface of the quartz glass sheet and the diamond compact, and welding along the outer edge of the quartz glass sheet to form a welding sample; the welding sample is placed in an annealing furnace to be subjected to annealing treatment; carrying out welding strength test on the annealed welding sample to obtain shear strength; in the whole welding process, femtosecond laser welding has extremely high peak power and extremely short energy deposition time, a heat affected zone can be controlled at the micro-nano scale, and generation of thermal stress and cracks is effectively restrained; an efficient and reliable method is provided for micro-nano connection of superhard heterogeneous materials, and high-strength welding of the diamond sheet and the quartz glass sheet under the non-clamping and non-contact conditions is achieved.

The present invention relates to the technical field of electric skateboard batteries, and discloses an electric skateboard range-extending battery method and system, the system comprising: a battery module, including a main battery and a range-extending battery, for powering the electric skateboard; a data monitoring module, for collecting travel information, and state parameters of the main battery and the range-extending battery; a data storage module, for storing the travel information and constructing a travel data set; a strategy module, for formulating a power supply strategy based on the travel data set, and adjusting the power supply strategy based on the real-time state parameters of the main battery; a power supply control module, for executing the power supply strategy and controlling the working states of the main battery and the range-extending battery. The present invention effectively improves the endurance, driving experience and battery life of the electric skateboard through intelligent battery management and flexible power supply strategies, bringing high-quality and reliable travel experience to users of electric skateboards.

The utility model relates to vehicle peak power energy storage technical field, and disclose vehicle peak power energy storage system based on diode isolation and sodium electricity compensation, include: sodium battery, DC-DC converter, monitoring unit, DC bus, D1 diode and D2 diode, sodium battery links with DC-DC converter, DC-DC converter connects monitoring unit, DC-DC converter and sodium battery all are connected with DC bus, D1 diode is located between sodium battery and DC bus, D2 diode is located between DC-DC converter and DC bus, monitoring unit can perceive vehicle power demand change, cooperates DC-DC converter control, makes sodium battery timely access circuit to supplement lithium battery power output gap, satisfies the peak power demand under the vehicle specific scene, diode can realize sodium battery branch and the effective isolation of relevant circuit, guarantees system operation safety, the mixed passage design formed by diode and DC-DC converter realizes the technical effect of no loop current safety.

The application relates to the technical field of laser processing, and particularly provides a laser pulse shaping device, a laser device and a laser pulse shaping method.The device comprises a first connecting piece, a second connecting piece and a light blocking piece; the first connecting piece is configured to connect a pre-amplification device and output first light; the first light comprises first laser pulses and continuous light; the second connecting piece is arranged at intervals from the first connecting piece; the second connecting piece is configured to connect a main amplification device and input second laser pulses to the main amplification device; the pulse width of the second laser pulses is smaller than that of the first laser pulses; the light blocking piece is arranged between the first connecting piece and the second connecting piece; the light blocking piece is provided with a light blocking part, the light blocking piece can rotate at a target frequency and a target time delay relative to the first light, the light blocking part blocks the continuous light and shapes the first laser pulses to obtain the second laser pulses. The application shapes and blocks the continuous light of the laser through the light blocking piece, effectively improves the peak power, and improves the processing quality and efficiency.

Disclosed herein are an electronic device and a method of operating the electronic device, according to various embodiments. The electronic device includes: a communication circuit configured to transmit and / or receive a plurality of packets to an external electronic device; and a processor, wherein the processor may determine whether to operate in a time average specific absorption rate (TAS) mode of the communication circuit upon detecting that an external object is in contact with or in proximity to the electronic device, and increase a latency between at least some packets of the plurality of packets based on a value associated with quality of a signal transmitted by the external electronic device satisfying a specified condition while the communication circuit is operating in the TAS mode, and wherein the processor may be configured to control the communication circuit to increase a strength of a signal that includes a plurality of packets having the increased latency. Various other embodiments are possible.

The invention belongs to the field of optics, and relates to an additive and subtractive optical system and an additive and subtractive forming method, the additive and subtractive optical system comprises a forming light generating device, a 3D galvanometer group, a visual monitor and window glass; the forming light generating device generates forming laser; the 3D galvanometer set and the window glass are sequentially arranged on the light path where the forming laser is located from front to back. The monitoring visual field of the visual monitor covers the window glass; and the forming laser passes through the window glass and then enters the additive and subtractive working surface. The invention provides an additive and subtractive material optical system and an additive and subtractive material forming method which can ensure smooth proceeding of additive and subtractive material processing, ensure forming quality and improve forming efficiency.

The application provides a tunable pulse train laser and a design method thereof, the laser comprising a pumping light fiber coupling focusing system, a cavity mirror, a laser crystal, a passive Q-switching crystal, an active Q-switching system and a laser output mirror arranged in sequence according to an optical path; the tunable pulse train laser is configured to: in a working state, through the equivalent length control of the passive Q-switching crystal and the modulation control of the active Q-switching system, the number of pulse trains is controlled under the same main frequency, or the same pulse train is output under different main frequencies. The application uses the active Q-switching system and the passive Q-switching crystal in cooperation, uses the active Q-switching and the passive Q-switching in combination to obtain the output of the main frequency plus the pulse train, is favorable for the multiple processing at the same point in the fine machining, and the single pulse energy is constant, thereby providing a pulse train laser scheme which is lower in cost, more ingenious and simple in structure, good in regulation flexibility, and higher in stability and reliability of the laser.

The invention discloses a high-peak power all-fiber femtosecond laser system based on a GMN spectrum shaping technology, and belongs to the field of laser technologies and nonlinear optics. Comprising an all-fiber broadband GMN seed source, an all-fiber anti-gain narrowing spectrum shaping system based on a nonlinear amplification loop mirror, a high-power fiber laser amplifier and a pulse compressor. The optical fiber laser comprises the following optical devices: a pumping source, a wavelength division multiplexer, a gain optical fiber, a 2 * 2 optical fiber coupler, a beam combiner, a filter, a pumping stripper and a grating pair compressor. According to the high-peak-power all-fiber femtosecond laser system based on the GMN spectrum shaping technology, a spectrum shaping anti-gain narrowing technology is introduced while a wide-spectrum light source generated by the GMN technology is further amplified, and the output energy and the peak power of the laser system are improved while ultrashort pulse width femtosecond laser output is guaranteed; and the application prospect of the gain management nonlinear amplification technology is widened.

This invention discloses a peak power control method and related apparatus based on ultrashort, ultra-intense lasers. The method includes: constructing an electron spectrum separation system to obtain the spatial distribution of the electron spectrum; controlling the gas density gradient in real time; adjusting the gas electron density using different parameters according to the spatial distribution of the electron spectrum; establishing a quantitative mapping model of back pressure-electron density-microwave intensity; adjusting different target structures to obtain the control law of the target structure on the electron return path; and obtaining a microwave parameter control strategy by comprehensively considering the synergistic effect of gas type, back pressure gradient, and target structure to control the peak power. This invention, by controlling key parameters such as gas type and pressure gradient, combined with microwave time-frequency diagnostics and synchronous measurement of the electron spectrum, reveals the electron return dynamics of microwave radiation sources, filling the technological gap in high power and spectral flexibility of traditional technologies, and laying the foundation for the development of novel controllable microwave radiation sources.

The invention provides a miniaturized all-solid-state laser and a laser detection system, and the laser comprises a shift signal generation module (1) which is used for generating multiple shift square wave signals; the multi-path pulse constant current driving module (2) is used for converting the multi-path shift square wave signals into multi-path constant pulse current; the semiconductor laser array pumping module (3) is used for generating a plurality of paths of pumping light signals according to a plurality of paths of constant pulse current driving modes; the laser bonding crystal (4) is used for converting multiple paths of pump light signals into multiple paths of laser pulse signals in a passive Q-switching mode; the micro detection array module (5) is used for monitoring the multiple paths of laser pulse signals and generating multiple paths of negative pulse electric signals synchronous with the multiple paths of laser pulse signals; the optical synchronization signal feedback module (6) is used for converting the multi-path negative pulse electric signals into negative pulse synchronization feedback signals and inputting the negative pulse synchronization feedback signals into the multi-path pulse constant-current driving module (2) to form a negative feedback network; and the optical distribution module (7) is used for changing the propagation direction of the multiple paths of laser pulse signals.

The invention relates to the technical field of solid lasers, and discloses an orthogonal polarization output cavity dumping laser based on a corner cube prism. The laser comprises a pump source, a first polarizer, a second polarizer, a Ho:YLF crystal, an RTP crystal, a third polarizer, a first half-wave plate, a first corner cube prism, a first right-angle prism, a second corner cube prism, a second right-angle prism and a second half-wave plate; two corner cube prisms and two right-angle prisms constitute a ring resonant cavity, the two corner cube prisms are arranged in the same manner, linear polarized light with a special polarization azimuth passes through the two corner cube prisms in four different reflection orders respectively, so as to achieve a polarization-maintaining effect, and cavity dumping laser output can be achieved by coordinating with the voltage rise and fall time of the RTP crystal, and the two polarizers are respectively used as output mirrors of vertical polarized light and horizontal polarized light, so as to obtain orthogonal polarization synchronous output pulse laser with high peak power, large energy and high stability.

The invention discloses a laser radar detection system and method, and belongs to the technical field of detection, and the method specifically comprises the steps that a laser source emits a pulse type detection laser sequence; the counting type photoelectric detector receives a return light signal reflected by a detected object in a field of view through two different modulation phases, and the delay between the two different modulation phases is 180 degrees. Two digital domain counting signals with different phases can be obtained, the common noise problem in an analog signal chain in the prior art is eliminated, and therefore better signal-to-noise ratio performance is shown when narrow pulse optical signals are processed.

The application belongs to the technical field of laser drilling, and provides a 5G ceramic medium filter femtosecond laser drilling device and method, which comprises a femtosecond laser, and a pulse energy adjusting and controlling system, a laser pulse shaping system and a laser rotary drilling system arranged on the light beam path of the femtosecond laser. The femtosecond laser is used as a drilling light beam, has the advantages of high peak power, short action time, low material processing threshold and micron-level focused light spot, etc., can avoid the melting of the 5G ceramic medium filter material, instantaneously change the material on the 5G ceramic medium filter into plasma and emit it away, realize drilling in a very short time when heat has no time to transfer between electrons and lattices in the 5G ceramic medium filter material, and avoid the generation of thermal effects.