83results 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 discloses a pulse modulation circuit of an ultra-wideband super-continuum fiber laser, belongs to the technical field of ultra-wideband super-continuum fiber lasers, and solves the problem that the phase noise floor of a clock circuit is directly lifted due to the fact that power supply ripple coupling and LDO filter network efficiency is insufficient, for example, the output capacitance ESR is too high or a pi-type filter is missing. Comprising an input filtering module, a low dropout linear regulator module, a pi-type filter module, a clock power supply distribution module and a grounding system module. According to the utility model, high-frequency ripple filtering, voltage ripple depth suppression and residual noise absorption are carried out on power supply output through a three-stage sequential filtering framework, and finally, super-stable power supply with a phase noise base lower than-152dBc / Hz and 1kHz offset is provided for the clock circuit, so that the time sequence precision of super-continuum spectrum laser pulses is ensured.

The invention discloses an integrated free electron laser on-line collimation and visible indication laser system and method, and the system employs a theoretical center line representing a magnetic axis of an undulator as a reference, and a collimation system completes the coincidence collimation of an electron beam axis and an optical axis with the theoretical center line; the visible light indication system provides a reference visible light beam for downstream beam line commissioning, where the reference visible light beam coincides with the theoretical centerline, and the system can be independently commissioned out of vacuum. The collimation system and the visible light indication system are mutually independent, are coupled through the upstream reflector and the downstream reflector, do not influence each other, and can be permanently used on line.

To realize a light-emitting device with reduced wiring resistance. [Solution] A light emitting device comprising: a plurality of semiconductor laser elements, each having a top surface and a light emitting surface, including a first semiconductor laser element and a second semiconductor laser element; a plurality of protection elements, including a first protection element that protects the first semiconductor laser element and a second protection element that protects the second semiconductor laser element; and a plurality of wirings, including a first wiring bonded to the first protection element and a second wiring bonded to the second protection element, electrically connecting the plurality of semiconductor laser elements and the plurality of protection elements, wherein the first wiring is not bonded to the first semiconductor laser element, and the second wiring is bonded to the top surface of the second semiconductor laser element.

A method of producing an array of stimulated emission light emitting devices comprises: forming a plurality of layers of material; forming a dielectric mask layer over the plurality of layers, the dielectric mask layer having an array of holes through it each exposing an area of one of the layers of semiconductor material, and growing a light emitting structure in each of the holes arranged to emit light of at least one wavelength by stimulated emission. At least one of the plurality layers forms an upward reflector arranged to reflect light of said at least one wavelength.

The invention discloses a radio-frequency pulse power supply for a radio-frequency carbon dioxide laser, and the power supply comprises an input unit which inputs a radio-frequency signal; the first-stage power amplification unit is used for receiving the radio frequency signal, amplifying power and outputting a first-stage amplified radio frequency signal; the first-stage power distribution unit receives the first-stage amplification radio frequency signal and equally divides the first-stage amplification radio frequency signal into two paths of first-stage distribution radio frequency signals with the same power for output; the second-stage power distribution units are arranged in pairs, receive the first-stage distribution radio-frequency signals, uniformly divide the first-stage distribution radio-frequency signals into two paths of second-stage distribution radio-frequency signals with the same power through voltage reduction and transformation, and output the two paths of second The second-stage power amplification unit receives one path of second-stage distribution radio frequency signal, amplifies power and outputs a second-stage amplification radio frequency signal; the power synthesis unit is used for receiving the four paths of secondary amplification radio-frequency signals and synthesizing the four paths of secondary amplification radio-frequency signals into high-power radio-frequency signals for output through boost transformation; and the output unit receives and outputs the high-power radio frequency signal. Through multi-stage amplification and multi-stage synthesis, pulse signal output with hundreds of watts to kilowatt peak power is realized.

The invention relates to the technical field of solid lasers, in particular to a large-energy green laser. The laser comprises a first pumping source, a first pumping coupling device, a second pumping source, a second pumping coupling device, a resonance assembly, a first frequency doubling crystal, a second frequency doubling crystal, a Q-switching device, a first crystal and a second crystal. The resonant assembly is used for forming a laser resonant cavity and further comprises a compensation device. According to the large-energy green laser provided by the invention, the thermal lens effect of the laser crystal can be weakened through the double-pumping double-crystal, so that the fundamental frequency light can be better amplified. And the arranged compensation device can also improve the overall thermal management of the laser by compensating the thermal lens effect, and is beneficial to outputting stable and high-energy laser.

The application discloses a kind of laser radar and its driving circuit of laser system, including first interface circuit, second interface circuit, drive gating module, integrated drive module and drive current regulation module;First interface circuit receives first address signal and transmits first address signal to the address input end of drive gating module;Second interface circuit receives drive control signal and transmits drive control signal to the drive control end of integrated drive module;Drive gating module is used to output the gate signal to integrated drive module according to first address signal;Drive current regulation module is used to output current regulation signal to the current regulation end of integrated drive module;Integrated drive module is used to gate drive path according to gate signal, and control the drive path according to drive control signal and current regulation signal Output laser drive signal, can realize the miniaturization design of laser radar, reduce the difference of laser in each subarea driven, and drive current linear continuous adjustable.

The invention discloses a solid gain medium fission fragment pumping method and a pumping unit, nuclear fuel fission fragments are used as a pumping source, a solid laser gain medium is used for generating laser, and the solid laser gain medium is a semiconductor laser gain medium. The nuclear fuel fission fragments are used as a pumping source for driving, and the nuclear fission fragment pumping unit for generating laser by a solid laser gain medium is adopted, so that the inherent safety characteristic is ensured, the long endurance is ensured, and the reactor core safety of the energy technology in the unmanned operation process is ensured.

The invention discloses a high-stability dye laser control system and a control method. The system comprises a laser, a dye storage tank, a quencher storage tank, a regeneration circulation tank, a regeneration column and an automatic control module, the laser is provided with a laser cavity, the dye storage tank and the quencher storage tank are communicated with the regeneration circulation tank, and dye and quencher flow sensors are respectively arranged on pipelines between the dye storage tank and the regeneration circulation tank and between the quencher storage tank and the regeneration circulation tank; the laser cavity outlet, the regeneration circulation tank, the regeneration column and the laser cavity inlet are sequentially communicated, and a dye and quencher concentration sensor is arranged on a pipeline between the laser cavity outlet and the regeneration circulation tank; the inlet end and the outlet end of the laser cavity are respectively provided with a laser cavity inlet temperature sensor and a laser cavity outlet temperature sensor; the automatic control module controls the concentration of the dye and the quencher and the outlet temperature of the laser cavity to be within a set range. The dye laser system can keep the dye concentration, the quencher concentration and the temperature stable in the running process, and therefore it is guaranteed that laser energy is stable.

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.

The invention discloses a laser wavelength tuning circuit based on temperature control for an FBG demodulator. The laser wavelength tuning circuit comprises a current driving module used for providing constant driving current for a laser of the FBG demodulator; the temperature acquisition module is used for acquiring the temperature of the laser by adopting NTC in the laser as a temperature sensor; the temperature adjusting module is used for adjusting the direction and the size of working current of a semiconductor chilling plate TEC in the laser so as to adjust the temperature of the laser; the main control module is used for enabling the target wavelength output by the laser to correspond to the target temperature, calculating the temperature adjusting amount according to the temperature, collected by the temperature collection module, of the laser and the target temperature, generating a corresponding control signal and outputting the control signal to the temperature adjusting module. According to the invention, constant current driving of the laser is realized, the influence of current fluctuation is avoided, high-precision temperature control is realized, the wavelength tuning linearity is ensured, and the performance of the FBG demodulator is improved.

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.

The application discloses an ultrathin diamond clamping device, which comprises, from top to bottom, a graphite pressing block, a polycrystalline diamond limiting sheet, a polycrystalline diamond bottom sheet, a graphite bottom plate and graphite screws for fixing the above-mentioned elements; the polycrystalline diamond limiting sheet is provided with at least one rectangular notch, and the limiting groove for positioning the ultrathin diamond crystal sheet is formed by the rectangular notch and the polycrystalline diamond bottom sheet; the graphite pressing block covers the ultrathin diamond crystal sheet, the graphite screws pass through the graphite pressing block, the polycrystalline diamond limiting sheet and the polycrystalline diamond bottom sheet in sequence and are connected with the graphite bottom plate, the graphite pressing block is extruded by twisting the graphite screws, pressure is applied to the ultrathin diamond crystal sheet to realize clamping. According to the application, the ultrathin diamond clamping device has the advantages of low thermal load, small clamping stress, small radiation damage and the like, reliably supports the stable and efficient generation of the seed laser by the monochromator, and finally helps to realize the high-stability operation of the fully-coherent free electron laser.

The invention relates to a laser power supply protection circuit based on a third-generation semiconductor and a working method thereof, and belongs to the technical field of electronic equipment control. The power supply protection circuit comprises an EMC circuit, a PFC circuit and an LLC circuit which are connected in sequence, the PFC circuit and the LLC circuit are both connected with a control circuit, the control circuit is further connected with a water path protection circuit, and the water path protection circuit is connected with a water path sensor. The control circuit is matched with the PFC circuit and the LLC circuit to control the output of the power supply, so that the overall operation is smooth, the power supply efficiency is improved, the overall design is compact, the integration level of elements of the whole machine is improved, and miniaturization and integration of products are facilitated.

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.

Embodiments of this application disclose an optical amplifier, a related method, and a device, to reduce a nonlinear penalty of a lumped gain medium, increase equivalent incident power, and alleviate a noise figure of the optical amplifier. The optical amplifier provided in embodiments of this application includes a lumped gain medium, configured to: amplify an input optical signal of the optical amplifier to obtain a target optical signal, and output the target optical signal to a first multiplexer / demultiplexer; a first Raman pump unit, configured to: emit first Raman pump light, and output the first Raman pump light to the first multiplexer / demultiplexer, where the first Raman pump light is used to amplify the target optical signal; and the first multiplexer / demultiplexer, configured to couple the target optical signal and the first Raman pump light, to obtain output light of the optical amplifier.

In accordance with aspects of the present disclosure, an apparatus, system, and method are provided for stabilizing the length of a plurality of optical resonators. The apparatus includes an optical light source configured to output an incident light beam. The apparatus also includes a splitting member configured to receive the incident light beam output from the light source and split the received incident light beam to output two or more light beams. The apparatus further includes a plurality of optical resonators, where each optical resonator of the plurality of optical resonators is configured to receive one of the light beams output from the separating member and to transmit or reflect a portion of the light beams to indicate whether the optical resonator resonates with the optical source. Each optical resonant cavity is also configured to accommodate a substance qubit within the optical resonant cavity. Each substance qubit is configured to capture photons to distribute quantum entanglement, wherein the entanglement rate is enhanced by the Pelsel effect. Each optical resonator is further configured to be connected to an actuator. The actuator is configured to tune the length of the optical resonant cavity based on the portion of light transmitted or reflected from the optical resonant cavity to resonate the optical resonant cavity with the light source so as to lock the optical resonant cavity to the light source. The substance quantum bits are the same for each optical resonant cavity. The transition wavelength of the incident beam to the substance qubit is detuned in a ratio of two integers a and b, where a / b represents a fixed fraction to ensure that for each optical resonator, there is at least one point within the range of travel of the actuator that satisfies a dual resonance condition, where a / b represents a fixed fraction. And enabling the optical resonant cavity to resonate with the substance quantum bit and the incident light beam at the same time.

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 present application relates to a kind of self-injection terahertz light frequency comb system, wherein, terahertz quantum cascade laser is as light frequency comb source, beat frequency signal generated by self beat frequency is transmitted into first T-type biasing device;First T-type biasing device is used to transmit beat frequency signal to wave divider;Wave divider is used to divide beat frequency signal into two ways, one way is transmitted to circulator and participates in self injection, another way is connected to spectrum analyzer and carries out real-time detection;Circulator is used to keep the one-way transmission of beat frequency signal participating in self injection in loop;Phase shifter is used to phase match beat frequency signal participating in self injection;Second T-type biasing device is used to inject phase-matched beat frequency signal into terahertz quantum cascade laser;Spectrum analyzer is used to detect the self-injection beat frequency signal obtained in real time.The present application can improve the stability of system, meet the requirement as high-frequency optoelectronic oscillator.

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 utility model discloses a constant current source drive circuit of a laser, which comprises a switching power supply, a laser pumping source, a constant current source circuit, a switching circuit and a power control circuit, the output end of the switching power supply is connected with the input end of the laser pumping source, the output end of the laser pumping source is connected with the input end of the constant current source circuit, and the output end of the constant current source circuit is grounded; the first input end of the switching circuit is used for acquiring a switching control signal, the second input end of the switching circuit is connected with the output end of the power control circuit, the third input end of the switching circuit is used for acquiring a negative voltage driving signal, and the output end of the switching circuit is connected with the control end of the constant current source circuit; the switching circuit is used for controlling the third input end of the switching circuit to be disconnected from the output end of the switching circuit and controlling the second input end of the switching circuit to be connected with the output end of the switching circuit according to a switching control signal in a power-on stage; the problem that an existing constant current source drive circuit leaks light in the system power-on period is solved.

Technologies for a photon pair source integrated on a photonic die are disclosed. In an illustrative embodiment, a photonic die includes an integrated semiconductor laser. The integrated semiconductor laser pumps a Raman laser on the same die. The Raman laser has much lower noise near the laser peak compared to the semiconductor laser, due to a smaller gain bandwidth and less amplified stimulated emission. Due to the low noise, the Raman laser can be used to pump a spontaneous four-wave mixing (SFWM) source directly, without off-chip filtering required. The SFWM source can generate entangled photons with a high signal-to-noise ratio, with applications for quantum cryptography, quantum computing, and other quantum information processing tasks.

In one aspect, an apparatus includes an integrated circuit device including a first layer including a metal, a second layer including a first semiconductor material, a third layer including an active region of a second semiconductor material, and a fourth layer including a third semiconductor material, where the second layer is between the first layer and the third layer, and the third layer is between the second layer and the fourth layer; an optical interface configured to provide optical waves into different respective portions of the active region along propagation axes substantially parallel to each other, the propagation axes including a first propagation axis and a second propagation axis; a plurality of metal contacts in electrical communication with the fourth layer, wherein a first subset and a second subset of the metal contacts are arranged along the first propagation axis and the second propagation axis; and a power source configured to apply a respective electric field between the first layer and each of the metal contacts.

A matter ejection system (2), particularly for the ion propulsion of a spacecraft, includes a target (10); an illumination system (12) for illuminating a front face (10A) of the target (10) by means of laser pulses; an ion source (15); particle acceleration means (16) for accelerating an ion beam received from the ion source (15); a primary ion guide (18) including focusing means (19) for focusing the ion beam onto a focal point defined on a rear face (10B) of the target (10);an ejection zone (14) extending from the rear face (10B) of the target for the ejection of an ionic flux torn from the ion beam as the latter passes through a laser acceleration zone (35) at the focal point, under the effect of an acceleration normal to the target (10) induced by an electric field resulting from an interaction between the target (10), the laser pulses produced by the illumination system (12) and the ion beam. Figure for the abstract: Figure 2;