22 results about "Laser resonance" patented technology

The invention provides a high-speed and multi-dimensional spatial light field regulation and control device, which can realize high-speed regulation of multiple dimensions such as amplitude, phase, polarization and the like of a spatial light field. Comprising a pumping regulation and control system, a collimation focusing shaping system and a laser resonance system which are sequentially installed through a three-dimensional adjusting frame along a light path, and the three systems are located on the same horizontal optical axis and are vertically arranged. The pumping regulation and control system comprises a signal generator, a driving circuit and a pumping source; the collimating focusing shaping system comprises a collimating lens, a conical lens or a cylindrical lens and a focusing lens, the laser resonance system comprises a laser crystal and a laser resonant cavity, and the laser resonant cavity comprises a compact parallel plane cavity and an open type optical resonant cavity. Laser pulses with different amplitude characteristics can be output at different moments; laser pulses with different phase characteristics can be output at different moments; and laser pulses with different polarization characteristics can be output at different moments.

The invention relates to the technical field of laser pulses, in particular to a composite pulse laser device which comprises an output mirror, a polaroid, a laser gain module, a first reflecting mirror, a first Q switch, a second reflecting mirror, a second Q switch and a controller. A second reflecting mirror, a second Q switch, a polaroid and an output mirror form a second pulse laser resonance arm cavity, the polaroid transmits the first-direction polarized laser and reflects the second-direction polarized laser, and laser of tens of nanoseconds and hundreds of nanoseconds is output from the laser gain module and the output mirror. The pulse laser output of the first pulse laser resonance arm cavity and the second pulse laser resonance arm cavity is controlled through the controller, flexible adjustment of pulse intervals is achieved, the structure is compact, design is flexible, laser output of tens of nanoseconds and laser output of hundreds of nanoseconds can be achieved at the same time under the control of the same electric signal, and high practicability is achieved.

The application belongs to the field of heavy metal detection, and discloses a coal-fired heavy metal detection and analysis device and method based on LIBS-LAAS, which comprises a pulsed laser excitation unit, a wavelength-tunable continuous laser resonance absorption unit, a coaxial signal acquisition unit, a paraxial signal acquisition unit, a control and analysis unit and a displacement detection platform; the pulsed laser excitation unit comprises a pulsed laser, which emits pulsed laser and ablates a sample to generate plasma; the wavelength-tunable continuous laser resonance absorption unit comprises a wavelength-tunable continuous laser for emitting continuous laser to the plasma; the coaxial signal acquisition unit comprises a first spectrometer, which acquires LAAS absorption spectrum information of the continuous laser passing through the plasma. Through the application, the interference of the spectrum line overlap of the LIBS detection of heavy metal elements can be broken through, the spectrum information of multiple heavy metal elements in the coal sample can be acquired at the same time, the rapid detection and analysis of the heavy metal elements can be realized, and the accuracy of the heavy metal detection and analysis result is improved.

The invention relates to the technical field of epoxy floor quality detection, in particular to an epoxy floor coating thickness laser scanning and big data analysis device which comprises the steps that laser resonance spectrum scanning data and stress wave scanning data of the surface of a to-be-detected epoxy floor are acquired; based on the laser resonance spectrum scanning data, calculating a first vibration mode frequency set of the coating surface, and based on the stress wave scanning data, calculating a second vibration mode frequency set of the coating and the matrix interface; based on the first vibration mode frequency set and the second vibration mode frequency set, current thickness distribution of the coating is determined by inquiring a preset thickness and frequency correlation spectrum database; and based on the current thickness distribution and historical construction data in the thickness and frequency correlation spectrum database, performing matching degree analysis, and determining the uniformity grade and the potential defect area of the coating. And matching is carried out through data stored in the thickness and frequency correlation spectrum database, and potential defects are accurately identified.

The invention relates to an optical path system based on a Q-switched crystal and a laser, the optical path system based on the Q-switched crystal comprises a pumping source, a working crystal, the Q-switched crystal, an output film and a total reflective mirror, the output film is attached to the side, away from the pumping source, of the Q-switched crystal, a resonant cavity is formed between the total reflective mirror and the output film, the working crystal and the Q-switched crystal are both located in the resonant cavity, and the working crystal is located in the resonant cavity. The pumping source is used for emitting pumping light, the working crystal is used for converting the pumping light, and the Q-switched crystal is used for compressing pulse width; wherein pumping light emitted by the pumping source sequentially passes through the total reflective mirror, the working crystal, the Q-switched crystal and the output film and is reflected in the resonant cavity to form laser resonance, the laser resonance is emitted from the output film, and laser output characteristics are accurately controlled under occasions, environments and working conditions with different requirements.

The invention belongs to the technical field of nuclear fusion control, and specifically relates to a laser resonance driven projectile injection system. The laser resonance driven projectile injection system comprises a vacuum chamber, a focusing lens and the laser resonance driven projectile injection system arranged in the vacuum chamber. The laser resonance driven projectile injection system comprises a focusing lens 1, a parabolic mirror, a plane mirror and a projectile. The focusing lens is arranged outside the vacuum chamber and is used for converging a laser beam so that the focus of the laser beam falls on the projectile. The system has high laser energy utilization efficiency, fast projectile speed, adjustable projectile speed and high purity of injected impurities.

The present application discloses a method for automatically locking a dual-loop laser based on the Pound-Drever-Hall principle using an FPGA. It includes adding a high-carrier-suppression single-sideband modulator to a classical Pound-Drever-Hall system, and adding a second control loop composed of a voltage-controlled crystal oscillator, a frequency divider, a mixer, and a low-pass filter. In the FPGA, the error signal between the laser resonance frequency and the resonator resonance frequency is divided into high-frequency and low-frequency parts. The low-frequency signal controls the PZT of the laser resonator through the control loop constructed by the FPGA, and the high-frequency signal controls the single-sideband modulator through the high-frequency control loop constructed by the FPGA. At the same time, an automatic relocking mechanism is added to the system, and an automatic relocking algorithm is constructed using the FPGA. Only when the signal is in a controllable linear range is the signal output; otherwise, the locking mode is exited and scanning starts again until the linear range is entered. The present invention solves the problem of low frequency-locking accuracy caused by simply locking the PZT of the laser in the traditional PDH scheme by constructing a dual control loop.

The invention discloses a high-power excimer laser with low maintenance cost, which is characterized in that two ends of a cavity body of a laser discharge cavity are provided with light-transmitting mirrors, an electrode is arranged in the cavity body, two sides of the cavity body are provided with a first adjusting seat and a second adjusting seat, and the first adjusting seat is provided with a first laser resonance piece which is opposite to the light-transmitting mirror at one side of the cavity body in a spaced manner; and the second adjusting seat is provided with a second laser resonance piece which is separated and opposite to the light transmitting mirror on the other side of the cavity. The invention also discloses a light path debugging method, which comprises the following steps: firstly, finding the light path direction through the first diaphragm and the second diaphragm at the reference position, then determining the position of the laser discharge cavity through the fourth diaphragm and the fifth diaphragm, and then determining the positions of the first adjusting seat and the second adjusting seat through the sixth diaphragm and the seventh diaphragm. And finally, the angles of the first laser resonance piece and the second laser resonance piece are adjusted according to the light spot positions of the reflected light reflected by the first laser resonance piece and the second laser resonance piece on the third diaphragm. The device is low in maintenance cost and high in optical path debugging efficiency.

The present invention addresses the problem of providing a semiconductor laser element in which a decrease in reliability during a coating step is suppressed. A semiconductor laser element (100) is provided with three or more laser resonators (200 - 1-200 - 4) integrated adjacent to each other in a first direction. Each of the laser resonators (200) has an independent power supply electrode (150), and has an end surface coated in the longitudinal direction in the second direction. The plurality of electrode pads (Pe1-Pe4) are formed in pad regions (104, 106) adjacent to the laser region (102) in the first direction. Connection wires (Lc1-Lc4) each extend in a first direction, and electrically connect a power supply electrode (150) of a corresponding laser resonator (200) and a corresponding electrode pad (Pe). The thick-film pads (170) are formed in the pad regions (104, 106), and are higher than the stacked wiring structure (160) of the connection wires (Lc1-Lc4).

[Problem] To prevent light reflected by a light-emitting unit from returning to a light source and affecting the laser oscillation frequency of the light source. [Solution] This light-receiving device comprises: a measurement optical system that generates measurement light having a frequency that shifts at least discretely to two or more levels; and a light processing unit that causes prescribed oscillation light and return light of the measurement light from an object being measured to interfere with each other. The measurement optical system has a light-emitting unit that transmits the measurement light. The measurement optical system is also capable of transmitting the measurement light through laser resonance caused by at least inner-surface reflection of the light-emitting unit.

The invention provides a photonic crystal surface emitting laser, and relates to the technical field of semiconductor lasers. The photonic crystal surface emitting laser comprises an excitation part used for exciting laser; the transmitting part is used for enabling the laser to generate resonance and outputting the laser in the normal direction of a resonance surface through diffraction, the transmitting part comprises a plurality of photonic crystal units which are arranged in an array, and each photonic crystal unit is used for forming various different resonance modes during laser resonance; and two resonance modes with symmetrical electric field vectors in the multiple resonance modes are degenerate and coupled at an energy band point through the specific-shaped cross section of the photonic crystal unit.

This laser device is provided with: a light extraction unit that extracts, from incident light, light in a wavelength band that contributes to laser oscillation; and a laser resonance unit that is provided with a medium into which the light of the wavelength band extracted by the light extraction unit is incident.

This invention relates to the fields of laser technology and quantum sensing technology, specifically an alkali metal vapor laser for array-type atomic magnetometers. This laser aims to solve the problems of low power, wide linewidth, mediocre beam quality, and frequency instability in existing lasers for measuring extremely weak magnetic fields. The main components include a semiconductor laser pump source, fast and slow axis collimating mirrors, a coupling lens, an alkali metal vapor chamber, a front cavity mirror and a rear cavity mirror, a polarization beam splitter, a built-in F-P cavity, and a λ / 4 waveplate. The semiconductor laser pump source provides a narrow-linewidth pump laser after linewidth compression. The fast and slow axis collimating mirrors are used for collimation and shaping of the pump beam. The coupling lens couples the pump light into the alkali metal vapor chamber, which provides the gain medium for laser formation. The front and rear cavity mirrors are used to form laser resonance and perform mode selection. The polarization beam splitter separates the laser from the pump light and controls the laser polarization direction. The λ / 4 waveplate is used for converting linearly polarized light to circularly polarized light.

The present invention provides a photonic crystal surface emitting laser, which relates to the technical field of semiconductor lasers. The photonic crystal surface emitting laser comprises: an excitation part for exciting laser; an emission part for causing the laser to resonate and outputting the laser in the normal direction of the resonance surface by diffraction, wherein the emission part comprises a plurality of photonic crystal units arranged in an array, each of which is used to form a plurality of different resonance modes when the laser resonates, and two resonance modes with symmetric electric field vectors in the plurality of resonance modes are degenerately coupled at energy band points through a specific cross-section of the photonic crystal unit.

This invention discloses a laser isotope mass spectrometer, which consists of a controller, a LIBS subsystem, an SLRI subsystem, a timing controller, an ion transport primary focusing module, and a TOF mass analyzer. The beneficial effects of this invention are that the combination of LIBS laser and secondary laser resonance ionization (SLRI) allows for simultaneous preliminary analysis of elemental composition and content during the first LIBS ionization; based on the prior knowledge of the isotopic atomic energy levels of elements obtained from the first LIBS ionization, the resonance wavelength can be preferentially selected during the secondary resonance ionization. The four-channel SLRI optical path configuration enables tunable laser output from ultraviolet to infrared, and the application of ion focusing mirrors and reflectors enables spatiotemporally synchronized focusing and high-resolution mass sensing.

The invention relates to the technical field of defect detection, in particular to a ceramic bearing microcrack detection device, method and system. A ceramic bearing microcrack detection system comprises a ceramic bearing to-be-detected image acquisition module, a laser resonance module and a ceramic bearing microcrack detection module. The microcracks of the ceramic bearing are detected by combining the image information of the to-be-detected ceramic bearing and the resonance signal information under laser excitation, and the resonance signal information under laser excitation is more sensitive to the change of a material, so that image recognition can be assisted to more accurately detect the microcracks; and on the basis of the image information of the ceramic bearing to be detected, the parameters of the laser pulser are adjusted, so that the influence of a scattering effect and surface unevenness on resonance signal information under laser excitation is avoided, and the microcrack detection accuracy is further improved.

The invention discloses a semiconductor laser device based on an inclined grating and a manufacturing method thereof, and the method comprises the steps: controlling the inclination angle of an optical waveguide grating through controlling the inclination angle of a waveguide in the manufacturing of the optical waveguide grating of a semiconductor laser, and forming the inclined grating composed of an inclined seed grating and an inclined sampling structure; a phase shift structure is introduced into an inclined grating, phase matching of a laser resonant cavity at the phase shift structure is achieved through a microstructure quasi-phase matching technology, and laser single-wavelength lasing output with a specific wavelength is formed by electrifying a single electrode. The laser light source provided by the invention has the characteristics of accurate wavelength control, simple structure, low power consumption, high integration level and the like.

To provide an ultra narrow line width laser generation device.SOLUTION: An ultra narrow line width laser generation device contains: a light self-implantation lock loop; and an ultra stability cavity phase lock loop. The light self-implantation lock loop improves a quality factor of a laser resonance cavity, and narrows a line width. The ultra stability cavity phase lock loop locks a phase of an optical signal in a light self-implantation, realizes a synchronization of a frequency and an optical resonance cavity of a laser device, reduces a frequency noise of the laser device by a driving current of a feedback control laser device to improve a line width narrowing ratio of the laser device, and avoids the generation of a mode hopping phenomenon by a drift of the frequency of the laser device in order to perform a stable control against the frequency of the laser device of the ultra stability cavity phase lock loop, to improve a stability of a system.SELECTED DRAWING: Figure 1

The invention discloses a polarized EDFA (erbium-doped fiber amplifier) tunable laser, which is characterized in that non-polarized light is emitted through a gain medium, wavelength selection is carried out on the non-polarized light through a filter in a forward process, and then the light enters a polarization beam splitter to be split into a first polarization direction and a second polarization direction in a transmission direction and a reflection direction of the beam splitter; the light in the first polarization direction is subjected to power beam splitting through the power beam splitting coupler, the first beam of light serves as laser output and leaves the laser resonant cavity, the second beam of light serves as laser feedback, the polarization direction of the second beam of light is converted into the second polarization direction through the axis converter, the second beam of light is reflected back to the filter through the polarization beam splitter, and in the reverse process, the second beam of light is output. And the light in the second polarization direction sequentially and reversely passes through the filter and the gain medium and reaches the Faraday mirror, the light in the second polarization direction which is reversely incident is changed into the light in the first polarization direction, the light travels on a forward light path, and the light beam forms laser at an output port through continuously and circularly repeating a forward process and a reverse process.

The invention belongs to the technical field of laser equipment, and particularly discloses an ultra-narrow linewidth vertical external cavity surface emitting laser which comprises a laser resonance unit and an intracavity control unit, the laser resonance unit is used for generating laser oscillation, and the intracavity control unit is used for carrying out polarization control, mode control, wavelength tuning and linewidth narrowing on fundamental frequency light; the laser resonance unit comprises a pump light emitting system, a gain chip, a folding output mirror and a rear end mirror; the intracavity control unit comprises a beam splitter, a polarization element, a mode control element, a wavelength tuning element, a line width narrowing element and an output coupling mirror; second harmonic self-suppression of a mode control element is adopted to control a laser mode in a resonant cavity to realize single-frequency lasing, so that the design and adjustment difficulty of the mode control element in the resonant cavity of the vertical cavity surface emitting laser can be simplified; the output line width of the laser is narrowed by using the self-injection locking characteristic of the microcavity device in the line width narrowing element, so that the effect of deeply narrowing the laser line width can be achieved, and ultra-narrow line width output is realized.

The invention relates to a light path system of a solid laser and the solid laser, the light path system of the solid laser comprises a pumping source, a first plane mirror, a working crystal, a second plane mirror, a third plane mirror, a Q-switched crystal, a plano-convex mirror, a light emitting mirror module and a light emitting lens cone, the pumping source is used for emitting 808nm light, the working crystal is used for converting 808nm light into 1064nm light, and the Q-switched crystal is used for compressing pulse width; pump light emitted by the pumping source is transmitted to the plano-convex reflector through the first plane reflector, the second plane reflector and the third plane reflector in sequence, and the pump light is reflected by the plano-convex reflector and then is transmitted to the light emitting reflector module through the third plane reflector, the second plane reflector and the first plane reflector in sequence to form laser resonance. After resonance, the laser is emitted from the light-emitting lens barrel, the pump light can be amplified and multiplied more effectively, the laser output power is higher, and the machining requirement is met.

A method and a laser for breaking through the limitation of fluorescence spectrum on laser wavelength is disclosed. The method includes: exciting electrons to a high energy level by pump light, and suppressing an oscillation of radiation light by laser cavity coating, using a laser resonance to enhance a transition probability of an electron-phonon coupling from the high energy level to a multi-phonon coupling level, so as to realize the emission and enhancement of breakthrough fluorescence spectrum and realize the radiation light oscillation, wherein the laser cavity includes an incident mirror, a folding mirror, a tuning element and an exit mirror arranged in sequence along an optical path direction, the laser gain medium is located between an incident mirror and a folding mirror in the laser resonator, and the tuning element is arranged in the laser cavity at a Brewster angle.