23results about "Excitation process/apparatus" patented technology

An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal according to a drive current. The current source adjusts the drive current to be supplied to the optical amplifier. The storage previously stores an information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the drive current. The controller acquires, from the storage, the input-output characteristics corresponding to the drive current value of the drive current supplied to the optical amplifier and controls the electric signal based on the acquired input-output characteristics.

The application provides a laser driving abnormality protection method and device, relates to the technical field of safety protection of laser radars, is applied to a laser driving protection system, and the system comprises a laser driving main loop and a control feedback loop; the control feedback loop is provided with a MOS tube and an operational amplifier; the operational amplifier is connected with the laser driving main loop through a sampling resistor; the MOS tube is electrically connected with the operational amplifier; the method is that loop voltage of the laser driving main loop is monitored in real time, abnormal conditions are determined according to different voltage states, and the MOS tube and the operational amplifier are controlled and regulated according to corresponding preset strategies to execute protection, the technical problems that a traditional single current type protection circuit cannot timely cope with overvoltage, driving main loop short circuit and uncontrolled load recovery current are solved, and the technical effects of improving the abnormality protection capability of the laser and reducing the risk of device damage are achieved.

The utility model relates to the technical field of shock -proof buffer structure, and disclose a kind of laser internal circuit board shock -proof buffer structure, including connecting strip, the left side of the connecting strip is provided with shock -proof buffer mechanism, the top of the connecting strip is provided with limiting mechanism.The laser internal circuit board shock -proof buffer structure, through the aluminium foil layer and silicon rubber layer of staggered laminated distribution, energy generated by vibration can be absorbed, and then realize the shock -proof buffer of circuit board, simultaneously utilize the characteristics that aluminium foil layer can provide high heat conduction path, can be discharged in the cooperation of heat conduction channel formed by strip-shaped radiating groove and honeycomb radiating groove, the energy of circuit board heat emission, while solve the limitation of existing rubber shock pad, no heat insulation phenomenon generated by poor heat conductivity occurs, the heat of circuit board cannot be accumulated, and then avoid the material accelerated aging of shock -proof buffer structure due to long-term high temperature, ensure that under long time use, shock -proof buffer effect will not be reduced.

An optically pumped solid state laser (OPSL) module is disclosed. A submount unit is provided having raised wedged portion(s) to accommodate at least one gallium and nitrogen (GaN) containing pump laser diode. The at least one GaN pump laser diode is mounted on a wedge such that the light emission points at a downward angle, through beam shaping optics, and onto a GaN gain chip that is placed on a centerpiece platform representing a space between the lower portion of the one or more wedged portion(s). The gain chip is made of a series of spacer and active regions, all epitaxially formed, so that upon pumping from the pump laser diode(s), there is photonic emission from the gain chip. The gain chip spacer and active regions are selected based upon the desired wavelength output. Each active region may be spaced apart based on a half-wavelength metric.

The application discloses a laser pump source driver and a driving method and a laser. The driver comprises a signal detection module, which detects a DA signal of a load current setting of a power supply module in real time; an instruction generation module, which is used for generating a feedforward boost control instruction when a change rate of the DA signal exceeds a preset change rate threshold or a change amplitude exceeds a preset change amplitude threshold, the feedforward boost control instruction comprising a preset boost amplitude and a boost duration; a power supply module, which receives the feedforward boost control instruction and increases an output voltage by the preset boost amplitude within the boost duration; and the instruction generation module generates a feedforward boost control instruction cancellation after the boost duration ends and applies the feedforward boost control instruction cancellation to the power supply module, so that the power supply module restores the output voltage to a normal value. Thus, the problem of current rapid drop caused by load change is solved.

This invention discloses a laser driving circuit. The circuit provides driving current to a laser output unit. The laser driving circuit includes a low-dropout linear regulator and a constant current source circuit. The low-dropout linear regulator, the laser output unit, and the constant current source circuit are connected in series to form a series circuit. The low-dropout linear regulator provides a stable voltage to the laser output unit, and the constant current source circuit stabilizes the current in the series circuit. This invention, by using a low-noise low-dropout linear regulator, provides a stable voltage to the laser output unit while reducing the impact of power supply noise on the driving current, thus enhancing the anti-interference capability of the laser driving circuit. By feeding back the output current of the laser output unit to the constant current source circuit, it enables a rapid response when the current changes, thereby ensuring the stability of the current in the series circuit and consequently guaranteeing the output stability of the laser output unit.

The present application relates to the technical field of precision adjustment device of free electron laser accelerator, especially to a displacement table limiting device. The displacement table limiting device comprises a pitch angle limiting component, a yaw angle limiting component and a displacement limiting component. The pitch angle limiting component, the yaw angle limiting component and the displacement limiting component are arranged to independently undertake the functions of pitch angle over-limit limiting triggering, yaw angle over-limit limiting triggering and horizontal and vertical displacement over-limit limiting triggering, so that the angle limiting and the displacement limiting are independent of each other in function and do not interfere with each other, the decoupling of the angle limiting and the displacement limiting is realized, the accuracy and reliability of the limiting are improved, and the collision of the focusing coil and its support seat with the surrounding equipment due to excessive movement can be effectively prevented, and the safety of the equipment is ensured.

The application discloses a CRDS cavity mode fast matching laser driving method based on a pre-stored vector table and relates to the technical field of cavity ring-down spectroscopy.The CRDS cavity mode fast matching laser driving method based on the pre-stored vector table first controls a laser driver to perform first scanning in a preset wavelength range with a first scanning step, records a driving signal value after a ring-down signal is triggered and sequentially stores the driving signal value into a mode vector table; subsequent scanning is performed on each matching point in the table, a predicted offset and a starting point are determined according to historical data, scanning is performed in a search window with a smaller second scanning step, data in the table is updated after triggering, and the operation of jumping to a next matching point to predict a starting point is repeated until scanning and updating of all points are completed.The application realizes cavity mode fixed-point scanning through the pre-stored vector table, greatly reduces invalid scanning time, improves matching speed, accurately captures a resonance point, adapts to cavity mode drift, and guarantees matching accuracy and stability.

Optical gain mediums are required for lasing devices and high intensity optical systems across a wide range of applications. A method for achieving optical gain includes an optical gain medium having colloidal quantum fountains includes providing pump radiation to the gain medium. The electrons of the colloidal quantum fountains are promoted from a valence band to an excited state in a conduction band of the colloidal quantum fountains. Seed radiation is provided to the gain medium and electrons of the quantum fountains are de-excited by the seed radiation through stimulated emission from the excited state to a lower energy state of the conduction band, thereby providing optical gain.

The invention relates to a directly modulated light source (DMD) comprising: - a horizontal laser diode (DH) comprising a horizontal PIN junction (HJ), the horizontal junction being formed of an intrinsic region (Zi) disposed between a first p-doped region (Zp1) and a first n-doped region (Zn1), the intrinsic region comprising quantum wells; - a vertical PIN junction (VJ) formed of said intrinsic region disposed between a second p-doped region (Zp2), and a second n-doped region (Zn2) disposed on the substrate side; the vertical junction being reverse biased and modulates said light emitted by the horizontal laser diode by Stark effect in the quantum wells; - a blocking layer (CB) disposed under the first p-doped region and configured to prevent current leakage between the first p-doped region and the second n-doped region.

The present application relates to the technical field of laser devices. Disclosed are a pump assembly and a solid-state laser. The pump assembly comprises: a gain medium rod and a plurality of pump sources, wherein the plurality of pump sources are arranged in an array in the axial and circumferential directions of the gain medium rod; the plurality of pump sources are all configured to emit light towards the gain medium rod; a plurality of pump sources arranged in the circumferential direction and facing the same cross section of the gain medium rod are spaced apart from each other, and a plurality of pump sources which are collinear in the axial direction are also spaced apart from each other; the plurality of pump sources facing the same cross section of the gain medium rod form a group of pump sources; the projections of two adjacent groups of pump sources on the same plane in the axial direction are staggered from each other; all the pump sources are connected in series to form at least one power supply circuit; and the pump sources are configured to emit light towards the gain medium rod when energized, so as to excite the gain medium rod to output laser light. By means of the above manner, the present application can alleviate the heat generation problem of the gain medium rod and the pump sources on the basis of ensuring that the output laser light has relatively good uniformity.

A light source includes a linear accelerator for accelerating an electron bunch to a relativistic energy. The light source further includes a first grating, downstream of the linear accelerator and arranged such that the electron bunch is transmitted through the grating to produce a diffraction pattern. The light source further includes an emittance exchange device, downstream of the first grating, that rotates the diffraction pattern to a direction substantially parallel to a direction of propagation of the electron bunch. The light source further includes a laser that produces a pulse of light. The light source is configured such that the pulse of light from the laser interacts with the electron bunch in an overtaking geometry at an interaction point, downstream of the emittance exchange device, while the diffraction pattern is substantially parallel to the direction of propagation of the electron bunch to produce light via inverse Compton scattering.

The present disclosure provides a power supply for a pulsed laser, a pulsed laser device, and a method for manufacturing an electronic device. The power supply for a pulsed laser has a step-up transformer, a first magnetic pulse compression circuit that transfers charge of a first transfer capacitor connected to a secondary side of the step-up transformer to a second transfer capacitor, a second magnetic pulse compression circuit that transfers charge of the second transfer capacitor to a peaking capacitor, a reset circuit, and a series circuit of a resistor and an inductor connected in parallel to the peaking capacitor, a resistance value R of the resistor being 100 Ω or more and 1000 Ω or less, an inductance L of the inductor satisfying the following two equations when a capacitance of the peaking capacitor is Cp, a resonance angular frequency when transferring charge from the second transfer capacitor to the peaking capacitor is ω, a repetition frequency is Rep, and a required time for magnetic reset is Tm.

Disclosed are a circuit for powering a plurality of lasers, a laser radar, and a vehicle. The circuit comprises: a first capacitor connected to an anode of a first laser; a second capacitor connected to an anode of a second laser, a cathode of the first laser, and a cathode of the second laser; a first charging circuit connected between a first power supply end and the first capacitor and configured to charge the first capacitor at a first charging time; a second charging circuit connected between a second power supply end and the second capacitor and configured to charge the second capacitor at a second charging time; a switching circuit connected between the cathodes of the first laser and the second laser and a first signal end and configured to turn on or off the connection between the cathodes of the first laser and the second laser and the first signal end; and a current branch connected between the cathodes of the first laser and the second laser and a second signal end. The present disclosure has the technical effects of improving the reliability of laser power supply and improving the detection performance of the laser radar.

The application discloses a kind of based on multi-channel diffraction grating ultrafast laser intensity modulation method and system, method includes: placing optical element according to optical path design, alignment optical axis, adjust the output direction of ultrafast laser and system main optical axis coincide, complete preliminary calibration.Laser is split by blazed grating, focused to each channel electro-optic modulator by microlens array;8 independent electric modulation signals are generated synchronously, and after loading, the intensity modulation of multi-channel sub-beam is completed, and then synthesized by confocal aspherical mirror to eliminate aberration.When the modulation contrast is less than 30dB, based on fast and slow deviation grading mechanism: high-frequency dynamic deviation is compensated by real-time voltage correction optical path, low-frequency slow change deviation is compensated by temperature control refractive index and fine adjustment grating angle to reduce crosstalk, until standard is reached.Finally, linkage control mechanism is established, and parameters are monitored and dynamically adjusted in real time.Modulation speed, precision and stability are improved.

The application discloses a narrow linewidth Raman frequency modulation laser based on a thin film lithium niobate, comprising: a distributed feedback laser serving as a pump light source; and a thin film lithium niobate photonic integrated chip; wherein the thin film lithium niobate photonic integrated chip is sequentially provided with an input coupling waveguide, a lithium niobate micro-ring, a connecting waveguide, a Sagnac reflection ring and an output coupling waveguide; the input coupling waveguide is coupled with the distributed feedback laser, the lithium niobate micro-ring is optically coupled with the input coupling waveguide and the connecting waveguide respectively; the Sagnac reflection ring is connected with one end of the connecting waveguide away from the lithium niobate micro-ring; and the output coupling waveguide is led out from the lithium niobate micro-ring and used for outputting narrow linewidth Raman frequency modulation laser. The application can solve the problems of poor self-injection locking and Raman frequency modulation coordination, low integration, wide laser linewidth and insufficient frequency tuning performance in the prior art, and realizes wavelength transfer and multi-wavelength rapid synchronous tuning of narrow linewidth Raman laser.

A method and a device for producing coherent Smith-Purcell electromagnetic radiation. The device includes an electrically conductive diffraction grating laterally defined by two electrically conductive outer side walls; a source for generating an electron beam above the diffraction grating. The electron beam is configured to interact with the diffraction grating so as to produce coherent Smith-Purcell electromagnetic radiation directed upstream of the diffraction grating in a predetermined direction. The device further includes a mirror configured to collect all of the electromagnetic radiation and redirect it parallel to the diffraction grating to an exit downstream of the diffraction grating.

The application provides a method for enhancing second harmonic generation based on a non-linear energy transfer mechanism, obtaining a heterojunction composed of a donor two-dimensional material A and an acceptor two-dimensional material B, and then exciting by a two-photon pumping light source to induce non-linear energy transfer, thereby enhancing the second harmonic generation of the acceptor two-dimensional material B; in the heterojunction, the donor two-dimensional material A is (LA)2(A) n‑1 Pb n I 3n+1 ; wherein LA is a C3-C6 alkylammonium ion or a phenylammonium ion; A is a C1-C2 alkylammonium ion or a formamidate ion; n is 1-4; and the acceptor two-dimensional material B includes at least one of MoS2, MoSe2, WSe2 and h-BN. The application can effectively enhance the SHG of the acceptor material.

The application discloses a nanosecond pulse laser driving control device and method, relates to the technical field of nanosecond pulse lasers, and comprises a main control module connected with a digital-analog conversion module, a direct digital synthesizer module, a reference operation and current monitoring module, a signal output selection module and a signal coupling and current monitoring module respectively; the reference operation and current monitoring module is connected with the digital-analog conversion module; a pulse signal generation and conditioning module is connected with the direct digital synthesizer module and the signal output selection module respectively; the signal coupling and current monitoring module is connected with the signal output selection module; the reference operation and current monitoring module and the signal coupling and current monitoring module are connected with a target nanosecond pulse laser, and the application can improve the stability and reliability in the driving control process of the target nanosecond pulse laser.

The invention relates to an optical parametric oscillator (2) comprising: - a laser source system (10) generating a pump light beam (100), - a dichroic mirror (20) receiving the pump light beam and transmitting a first combination light beam (102), - a focusing optical system (30) receiving the first combination light beam, - a nonlinear medium (40), the nonlinear medium generating at its output a second combination light beam (104), - a focusing optical system (32) receiving the second combination light beam, - a dichroic mirror (22) receiving the second combination light beam, the dichroic mirror reflecting, in a first direction, the signal light beam (108), and - a hollow optical fiber (70) receiving the signal light beam, the hollow optical fiber being wound upon itself. Figure to be published with the abbreviation: Figure 2

Some semiconductor gain chips used for both optically pumped and electrically pumped semiconductor lasers contain transparent layers for cooling or other purposes. These layers may cause unwanted etalon effect if one or more of the transparent layers are inside the laser cavity. The etalon effect may cause high laser output noise. The present invention provides ways to make low noise lasers with such semiconductor gain chips.

A sub-nanosecond laser system is disclosed. The sub-nanosecond laser system may include: a pump laser source operable to generate a pump laser beam having a pump wavelength; a first pump beam splitter operable to receive the pump laser beam and split the pump laser beam into at least a first split pump laser beam and a second split pump laser beam; a passively Q-switched seed laser operable to receive the first split pump laser beam and generate a seed laser beam; and an amplifier assembly operable to receive the second split pump laser beam and the seed laser beam. The amplifier assembly may include one or more amplifiers arranged in series in a multi-stage configuration, arranged in a multi-pass configuration, or a combination thereof.