29 results about "Master oscillator" patented technology

In some implementations, an optical device (e.g., a monolithic master oscillator power amplifier (MOPA) diode) may include a first facet, one or more gratings, an amplifier structure terminated with a second facet, and an oscillator array that includes multiple singlemode oscillators coupled to the first facet and to the one or more gratings. In some implementations, the multiple singlemode oscillators may be configured to generate multiple seed beams and to transmit the multiple seed beams into the amplifier structure through the one or more gratings.

The invention provides a semiconductor laser with an inclined cavity surface in a vertical plane and a manufacturing method. The semiconductor laser comprises a laminated structure; the main oscillator region, the power pre-amplifier region and the conical power amplifier region are sequentially integrated on the stacked structure in the extension direction of the axis of the waveguide optical path; the laminated structure is formed on the substrate; the substrate has a preset offset cutting angle, and the preset offset cutting angle is larger than or equal to 12 degrees and smaller than 17 degrees; wherein the semiconductor laser is provided with an output cavity surface formed by cleavage along the cleavage direction of the substrate at the output end of the conical power amplifier region, and the output cavity surface is obliquely arranged relative to the direction vertical to the axis of the waveguide light path in a vertical plane. The semiconductor laser effectively solves the technical problems of parasitic oscillation and light beam quality degradation induced by residual reflection of an output cavity surface of a monolithic integrated MOPA semiconductor laser in the prior art.

This invention relates to laser ranging optical systems, and more particularly to a phase-based laser ranging optical system. A phase-based laser ranging optical system includes a transmitting unit, a local oscillator signal receiving unit, a master oscillator signal receiving unit, and a reflector. The advantages of this invention are: by using an optical fiber instead of a beam splitter, a portion of the light emitted by the diode is transmitted to the local oscillator signal point via the optical fiber. Compared to using a beam splitter to provide the local oscillator signal, this method offers advantages such as lower noise, stronger anti-interference capability, and stronger shock resistance, thereby improving the accuracy of the phase-based laser ranging system.

The invention discloses a laser radar system for synchronously measuring the concentration of C12 and C13 carbon dioxide columns in the atmosphere. The laser radar system comprises a laser emission module, an echo receiving module and a data acquisition and processing module. The laser transmitting module adopts a main oscillation power amplification technology and is integrated with three 2051nm seed lasers, the wavelengths of the seed lasers are respectively locked at a C12 absorption peak, a C13 absorption peak and absorption valleys of the C12 absorption peak and the C13 absorption peak, and high-energy detection pulses are generated by using time division multiplexing and two-stage amplification. The echo receiving module collects back scattering signals through a telescope, and the back scattering signals are received by a detector after being filtered. The system monitors emission energy through an integrating sphere, a data acquisition module synchronously acquires emission and echo signals of each wavelength, and respective column concentrations of two isotopes are obtained through inversion according to a differential absorption algorithm. According to the invention, active, synchronous and high-precision column concentration remote sensing measurement of C12 and C13 carbon dioxide is realized, excellent daytime detection capability of the system is ensured, and real all-day continuous observation is realized.

This invention provides a monolithically integrated semiconductor master oscillator power amplifier laser, relating to the field of semiconductor optoelectronics technology. The laser comprises a master oscillator region and a power amplifier region integrated on the same substrate using standard semiconductor active region technology; the power amplifier region employs an active 1×1 multimode interference coupler structure; and the laser adopts a monolithically integrated structure. This invention can improve the problem of beam flattening, thereby facilitating coupling with optical fibers or waveguide devices, simplifying the system coupling process, and enabling large-scale production applications.

The invention provides a high-power pulse optical fiber laser range finder based on energy synthesis and a laser range finding method, and adopts the technical scheme of pre-amplification, beam splitting, multi-path power amplification and incoherent energy synthesis of single-path seed light to form a framework of combining main oscillation power amplification with multi-path parallel amplification and energy synthesis. The ultra-high energy pulse is output through the MOPA + SMC optical fiber laser beam splitting amplification technology, the bottleneck problem of single-path single-mode optical fiber energy output is solved, and the laser single pulse energy is remarkably improved. Compared with a solid laser, the all-fiber laser realizes all-fiber, high stability and high beam quality, is simpler in system structure, and synchronously improves three indexes including pulse energy, operating distance and repetition frequency of a laser range finder; the optical fiber laser range finder is widely applied to remote topographic mapping and three-dimensional modeling, ultra-long-distance industrial safety monitoring, ultra-long-distance sensing of next-generation automatic driving automobiles, power line patrol and the like, and the market competitiveness of the optical fiber laser range finder is greatly improved.

Methods and systems for synchronizing at least one remote local oscillator with a central local oscillator, comprising receiving a remote local oscillator signal from at least one remote local oscillator and a master local oscillator signal from the central local oscillator and in response determining a round-trip phase measurement of temporal delay variability of the duplex real-time link between the remote station and central station, measuring frequency vs. time of the remote local oscillator signal relative to the master oscillator, adjusting the measured frequency vs. time according to the round-trip phase measurement to remove effects of temporal delay variability over the duplex real-time link telemetry, digitally filtering the measured frequency to remove variations in frequency on timescales<10× the round-trip delay and that are known not to be intrinsically due to the remote local oscillator, generating a phase increment signal from the filtered measured frequency, receiving and adjusting the local oscillator signal according to the phase increment signal and in response generating a derived digital domain clock signal that tracks the master local oscillator signal and converting the derived digital domain clock signal to an ultra-low phase-noise time domain voltage clock signal.

The application discloses a low-noise high-gain 1550nm single-frequency optical fiber amplifier, which comprises an input end cap, a tap isolator, a preamplifier and a power amplifier; the input end cap is connected with one end of the tap isolator and is used for monitoring the power and spectrum of a signal and preventing the preamplifier from returning light in the 1.5mu m wave band; the other end of the tap isolator is connected with the preamplifier; the preamplifier is connected with one end of a first tap band-pass isolator in sequence and is used for filtering out broadband ASE and monitoring the preamplifier output through the first tap band-pass isolator; the other end of the first tap band-pass isolator is connected with the power amplifier; compared with the prior art, the single-pump double-stage double-channel master oscillator power amplifier structure is adopted in the application, the tap band-pass isolator and the polarization beam splitter are combined to replace the conventional Faraday reflector in the power amplification stage, and the spectral signal-to-noise ratio of the output signal light is effectively improved.

This application discloses a pump power supply switching method, a master oscillator power amplifier, a storage medium, and a product, relating to the field of fiber laser technology. The method involves acquiring the load current of a seed pump source; comparing the load current with a preset switching threshold to obtain the power supply status of a first power supply; and switching a second power supply to power the seed pump source when the power supply status is abnormal. The abnormal status is determined when the load current is below the preset switching threshold. By real-time monitoring of the seed pump source's load current and automatic switching to the backup power supply, the method achieves switching to the second power supply in case of a first power supply failure, quickly ensuring continuous power supply to the seed pump source and avoiding damage to the optical module due to seed light interruption, significantly improving the reliability and safety of the power supply.

A low wavelength infrared Super Continuum (SC) signal from a master oscillator introduces two or more seeds into an amplifier that supports the Raman effect. A counter-propagating, high-power, continuous wave, or quasi-continuous wave quantum cascade lasers pump (amplifies) a first optical seed creating a cascading amplification of subsequent optical seeds forming two or more tunable wavelength coherent optical pump sources.

This invention provides an oscillation circuit for a MEMS resonator, wherein: a bias circuit provides the DC bias voltage and tail current source bias voltage of the PMOS cross-coupled transistors to the core circuit of the main oscillator; therefore, each branch in the core circuit of the main oscillator can have only three transistors connected in series, and the three transistors are sufficient to realize the function of generating an oscillating sine wave signal, without the need to stack a large number of transistors; with fewer series transistors, the operating voltage of the core circuit of the main oscillator is correspondingly reduced, and the core circuit of the main oscillator can operate in a low power supply voltage environment, reducing the power consumption of the core circuit of the main oscillator. In other words, the oscillation circuit of the MEMS resonator provided in this application can reduce transistor stacking and lower power supply voltage while ensuring low phase noise and providing the same negative resistance, thereby reducing the power consumption of the oscillator and improving the quality factor of the oscillator.

A high power narrow linewidth laser system having a master oscillator power fiber amplifier (MOPFA) architecture including a master oscillator (MO) and an enhancer is provided. The laser system includes at least one photodetector (PD) operable to detect pulsed stimulated Brillouin scattering (SBS) light back propagating from the PA to the MO. The PD converts the detected SBS light into an electrical signal corresponding to a pulse peak power of the detected SBS light. The laser system has a central processing unit (CPU) that receives the electrical signal and is operable to determine whether a peak power of the detected SBS light is within a threshold safe power range of the SBS light in a range between 8 and 12 kW. If the peak power is within a threshold safe range, the CPU controllably reduces the output power of the MO-generated signal light for a period of 50 to 500 ns prior to turning off the booster to prevent the determined SBS peak power from reaching a critical peak power within 1 to 5 MW.

The application provides a multi-machine parallel network type inverter communication-free fast power scheduling method. The method independently deploys a virtual oscillator controller with Andronov-Hopf oscillator as the core in each parallel inverter locally, and each inverter is interconnected without communication link; in the steady state, each machine relies on the nonlinear limit cycle dynamics of the virtual oscillator controller to realize power communication-free sharing through the common coupling point; when the inverter receives a scheduling instruction, the target steady-state phase angle difference is inversely solved based on the local impedance estimation, and an auxiliary reference state is generated, the phase of the main oscillator is continuously evolved to the target working condition through one-way phase traction, and a short-time compensation voltage is applied to compress the residual error of the physical circuit when the optimal switching trigger condition is met on the alpha-beta two axes; after the event is over, the local impedance estimation value is iteratively modified based on the active power residual error, and the scheduling unit is automatically exited according to the synchronization criterion.

The invention provides an all-solid-state high-repetition-frequency high-energy laser internal modulation coding method based on Q-switch internal modulation. The method comprises the following steps: designing a coding laser; constructing a main oscillator, matching with a thermal lens, and loading a coding mode to an electro-optical Q switch for driving to obtain an anti-interference pulse source; designing a matched light path and amplifying a pumping light spot to obtain a high-energy pulse; constructing a reconfigurable time sequence control platform supporting composite coding to obtain a reconfigurable coding controller, and outputting four paths of time sequence pulse trains by utilizing the reconfigurable coding controller; basic performance testing and complex scene testing of the laser are carried out, dynamic thermal management compensation is carried out, and an anti-interference sequence is obtained; and the pseudo-random jitter code is operated to obtain an anti-correlation interference sequence, and then the laser is subjected to graphical integration to obtain graphical description of the structure, the characteristics and the control logic. Accurate frequency coding, variable frequency coding and pulse position pseudo-random coding of the narrow-pulse-width laser are realized, and high-energy narrow-pulse-width laser output is also realized.

The invention discloses a terahertz laser based on free space Brillouin laser driving, and relates to the technical field of terahertz band lasers. The laser comprises a first pumping source, a first electro-optical modulation module, a first main oscillator power amplifier, a first 45-degree beam combiner, a first optical isolator, a first telescope assembly, a first half-wave plate, a free space Brillouin annular cavity, a second photoelectric detector, a first feedback control system and a first photoelectric detector. A second main oscillator power amplifier, a second electro-optical modulation module, a second pumping source, a second feedback control system, a first 45-degree reflector, a polarization control system and a difference frequency crystal; the characteristic that low-noise single-frequency laser can be achieved through Brillouin scattering is utilized, a space Brillouin laser structure is adopted, high-power and low-noise-level pump light in the difference frequency conversion process is obtained, and high-power and low-noise difference frequency conversion terahertz output is achieved. According to the invention, the output power and the signal purity of the terahertz laser are greatly improved.

The invention discloses an experimental verification device and method for a low-level control system under low power. The device comprises a main oscillator, the low-level control system, a power amplifier 1, a high-frequency resonant cavity, a power amplifier 2, a high-frequency cable and an oscilloscope. The high-frequency resonant cavity is used for experimental verification in an atmospheric environment, and a power divider, an attenuator and a phase shifter for desktop experimental verification in the atmospheric environment are replaced by a sampler, self attenuation, an inner rod, and the method comprises the following steps: the high-frequency resonant cavity does not need to be vacuumized; the oscilloscope observes the frequency and amplitude information of the established high-frequency field, and observes that the low-level control system controls the carbon fiber transmission rod and the stepping motor to move towards the tuning direction by adjusting an inner rod of the high-frequency resonant cavity; the low-power dynamic characteristic verification of the low-level control system based on the high-frequency resonant cavity is realized for the first time in the atmospheric environment, and the problem that the actual change of the high-frequency resonant cavity during power feeding cannot be reflected in real time by a desktop experiment method is solved.

The invention provides a full-period safety time sequence management and control system for an MOPA structure optical fiber laser, and relates to the field of integrated circuits, and the optical fiber laser comprises a main oscillator, a first-stage optical amplifier, a second-stage optical amplifier, a third-stage optical amplifier, a fourth-stage optical amplifier and an Nth-stage optical amplifier. The system comprises an analog comparator time sequence generation control circuit, and the analog comparator time sequence generation control circuit is configured as follows: when a first-stage optical amplifier to an Nth-stage optical amplifier are turned on, optical amplifier turn-on signals for controlling the first-stage optical amplifier to the Nth-stage optical amplifier to be turned on are sequentially generated according to a time sequence from a front stage to a rear stage; and when the first-stage optical amplifier to the Nth-stage optical amplifier are turned off, optical amplifier turn-off signals for controlling the Nth-stage optical amplifier to the first-stage optical amplifier to be turned off are sequentially generated according to the time sequence from the rear stage to the front stage. The time sequence control of each level of optical amplifier is realized based on the analog comparator, the simple, stable and reliable characteristics are realized by means of the time sequence of the analog comparator, and the problem that the time sequence output of the whole optical amplifier is out of control when an abnormal state occurs is solved.

The utility model provides a main oscillation amplification module for a laser radar, an optical fiber laser system and the laser radar. The main oscillation amplification module comprises: a housing; the pumping chip is arranged in the shell and is used for providing first light energy with a first wavelength, and the first light energy is transmitted along an optical path; the first optical element group is arranged in the shell and is used for preprocessing the first light energy; the gain optical fiber collimator is coupled with the gain optical fiber and is used for coupling the preprocessed first light energy to the gain optical fiber; and the dichroscope is arranged on an optical path between the first optical element group and the gain optical fiber collimator and is used for guiding the preprocessed first light energy to the gain optical fiber collimator. Separated optical devices are coupled and integrated into the shell, so that the integration level and the stability of the system are improved. In addition, the use of the dichroscope shortens the length of the optical fiber required by the system, reduces the fusion points of the optical fiber, and improves the manufacturability.

The present disclosure provides a carrier phase adjustment method and device, and a transmitter, wherein the method is applied to a carrier phase adjustment device, the device comprises a main oscillator, a phase detection module, a loop filter, a first accumulator and a voltage controlled oscillator which are connected in sequence; in response to a phase adjustment operation, a target phase to be adjusted under the phase adjustment operation is obtained; two digital modulation signals matching the target phase are generated based on a digital baseband generation mode; under the condition that the two digital modulation signals are applied to the first accumulator and the main oscillator respectively, based on a feedback link from an output end of the voltage controlled oscillator to an input end of the phase detection module, an adjusted phase finally output by the voltage controlled oscillator is determined. The present disclosure realizes flexible adjustment of the carrier phase through the digital baseband generation mode, the overall power consumption and area are reasonable, and the applicability is stronger.

The application discloses a high-energy-weight-ratio alkali metal vapor laser master oscillator power amplifier system, which comprises a transverse flow type alkali metal vapor cell, an alkali metal laser resonant cavity mirror, a 45-degree dichroic mirror and a semiconductor laser pumping source; the transverse flow type alkali metal vapor cell is used for providing a gain medium for the alkali metal vapor laser master oscillator power amplifier system; the alkali metal laser resonant cavity mirror provides a seed light source for the master oscillator power amplifier system; one end surface of the 45-degree dichroic mirror is coated with a full reflection film with a central wavelength being a laser wavelength and an anti-reflection film with a central wavelength being a pumping wavelength, and the other end surface is coated with an anti-reflection film with a central wavelength being the pumping wavelength; and the semiconductor laser pumping source comprises at least two semiconductor lasers, which are used as pumping sources of seed and amplification stages of the transverse flow type alkali metal vapor laser master oscillator power amplifier system respectively. The application has a small demand for heat dissipation equipment, can greatly reduce the volume and weight of the system and has a high-energy-weight-ratio advantage.

A merged master oscillator power amplifier (MOPA) laser module and method of manufacture thereof, the MOPA including a prefabricated chassis including a plurality of surfaces, a master oscillator laser (MO) permanently affixed to at least a first surface of the plurality of surfaces, a power amplifier (PA) permanently affixed to at least a second surface of the plurality of surfaces, and a beam delivery system (BTS) permanently affixed to the prefabricated chassis, wherein a spatial relationship between the at least one first surface and the at least one second surface determines alignment between the MO and the PA, and the BTS includes a plurality of optical elements for delivering light output from the MO to the PA for amplification.

The invention discloses an all-fiber pulse laser device based on optical fiber saturable absorption amplification and a generation method. The pulse laser device is composed of a pumping module, an optical fiber circulator, a doped saturable absorption optical fiber amplifier and a main oscillator. The method comprises the steps that the pumping module outputs pumping light to the optical fiber circulator; the optical fiber circulator transmits the pump light to the doped saturable absorption optical fiber amplifier, and meanwhile, the main oscillator generates a seed pulse signal and inputs the seed pulse signal to the doped saturable absorption optical fiber amplifier; pump light is absorbed through the saturable absorption effect of the doped saturable absorption optical fiber amplifier, ground state ions absorb the pump light and suppress oscillation of a main oscillator under low pumping power, the ground state bleaching effect triggers release in a pulse along with enhancement of the pumping power, meanwhile, pulse energy is amplified through stimulated radiation, and therefore the pulse energy is amplified. And high-peak power pulse laser output is obtained. The device and the method can realize high peak power, high average power and stable pulse laser output.

The invention provides an optical amplification device and method and a laser, and the device comprises a main oscillator which provides a main light beam of a first wavelength; the auxiliary oscillator provides an auxiliary light beam with a second wavelength; the first shaping optical module converges the two beams of light on a common focus, and the focuses of the two beams of light are the same in size; the first modulation module modulates the two beams of light based on an external trigger pulse and generates diffraction, so that the gain medium in the amplification module is kept constant and the two beams of light are coaxially superposed; the second shaping optical module is used for coupling the coaxial overlapped light beams into the amplification module; the amplification module is used for amplifying the power and the pulse energy of the emergent light beam of the second shaping optical module; and the spectrum optical splitter is used for separating the amplified main light beam and outputting the main light beam. According to the invention, constant laser parameters are kept in a variable time pulse sequence, and external free triggering and position synchronous output functions can be realized; pulse energy can be adjusted according to an external instruction; the method is suitable for material processing and other fields requiring stable laser parameters.

A kind of narrow linewidth single frequency high energy 1064nm laser for space-based wind lidar, using seed injection-based master oscillator power amplifier (MOPA) scheme, using narrow linewidth continuous single frequency distributed feedback laser (DFB) as seed source, two-stage semiconductor optical amplifier (SOA) modulated pulse width, single-end pumped crystal as preamplifier stage, two double-end pumped Nd:YAG slab as main amplifier stage;Two DFB seed sources are used to lock the frequency difference and correct the Doppler shift;Two-stage cascaded SOA pulse modulator has the advantages of narrow linewidth, high extinction ratio and small volume. Using 885nm LD end-pumping, good thermal management performance, helps to improve beam quality;End-pumping has high optical coupling efficiency, high Stokes efficiency under 885nm LD pumping, no intermediate relaxation heat, which helps to improve optical-optical conversion efficiency and save pumping.

The application provides a method for inhibiting SBS effect of a laser MOPA amplification system of a thulium-doped fiber laser, which comprises arranging a rectangular spectrum shaper between a master oscillator and a power amplifier, wherein the rectangular spectrum shaper is configured to adjust a Gaussian spectrum of laser pulses emitted by the master oscillator into a rectangular spectrum and then output to the power amplifier; and further comprising using a backward pumping mode and a fiber with a higher doping density. The application can effectively inhibit SBS effect by arranging the rectangular spectrum shaper, first shaping the Gaussian spectrum of seed laser into a rectangular spectrum, and then entering the power amplifier; using the backward pumping mode can reduce waste of pumping energy, improve energy pumping efficiency, and reduce the influence of SBS effect; and using the fiber with a higher doping density can further absorb pumping light in a shorter length, so that the optimal fiber length Lout is smaller, the interaction length of signal light and Stokes signal is reduced, and SBS effect is effectively inhibited.

A laser device includes a master oscillator configured to output pulse laser light at a first discharge timing synchronized with a repetition frequency; an amplifier configured to amplify the pulse laser light by exciting, with a charge voltage at a second discharge timing, a laser medium through which the pulse laser light passes; and a processor configured to provide a command on the charge voltage to the amplifier based on a charge voltage command value provided from an exposure apparatus, set the second discharge timing by adding a delay time to the first discharge timing, and perform a process of changing the delay time and a process of correcting the charge voltage command value in accordance with a change of the repetition frequency.

In some implementations, an optical device (e.g., a monolithic master oscillator power amplifier (MOPA) diode) may include a first facet, one or more gratings, an amplifier structure terminated with a second facet, and an oscillator array that includes multiple singlemode oscillators coupled to the first facet and to the one or more gratings. In some implementations, the multiple singlemode oscillators may be configured to generate multiple seed beams and to transmit the multiple seed beams into the amplifier structure through the one or more gratings.

A laser device includes a master oscillator configured to output pulse laser light at a first discharge timing synchronized with a repetition frequency; an amplifier configured to amplify the pulse laser light by exciting, with a charge voltage at a second discharge timing, a laser medium through which the pulse laser light passes; and a processor configured to provide a command on the charge voltage to the amplifier based on a charge voltage command value provided from an exposure apparatus, set the second discharge timing by adding a delay time to the first discharge timing, and perform a process of changing the delay time and a process of correcting the charge voltage command value in accordance with a change of the repetition frequency.

This application relates to the fields of time frequency and time synchronization technology, specifically, to a method for rapid compensation of clock frequency offset information based on a neural network model, including the following steps: Time calibration stage: Connecting a time reference source, using the same phase-locked unit to perform phase modulation on the main oscillator and the sub-oscillator respectively, generating the main reference voltage information of the main oscillator and the sub-reference voltage information of the sub-oscillator; monitoring the temperature and vibration information of the main oscillator during phase modulation; This application realizes real-time compensation of frequency offset caused by interference factors such as temperature and vibration during the absence of satellite correction window through dynamic learning of neural network; Utilizing the parallel compensation and confidence evaluation mechanism of dual oscillators, the optimal time source is dynamically selected, significantly improving the autonomous timekeeping accuracy and signal output stability of the system when an external time reference is missing.