16 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.

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.

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 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.

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 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.

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.