11 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 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 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.

[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.

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.

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.

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.