37 results about "Optical pumping" patented technology

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

A traceable multi-mode extremely weak magnetic field measuring device and method, comprising helium-3 atoms and an atomic magnetometer in a spin-exchange relaxation-free state, the helium-3 atoms polarized by metastable exchange optical pumping under an extremely weak magnetic field provide a traceable magnetic field value for the atomic magnetometer, the value is compared with the output response of the atomic magnetometer to obtain a calibrated scale factor of the atomic magnetometer, so that the measurement values of the atomic magnetometer are traceable. The atomic magnetometer meter head comprises four independent detection channels, the four detection channels are obtained by beam splitting of two detection lasers with different frequency detuning amounts, and the channels have high consistency. The method proposed by the application is compatible with the cooperative use of multiple probes, and can realize single-meter-head multi-channel measurement, meter-head internal magnetic field gradient measurement and meter-head inter-magnetic field gradient measurement three measurement modes, each mode has high consistency and high sensitivity.

The invention discloses a compact arbitrary transverse mode laser. The laser comprises a pumping source, a pumping focusing optical system, a laser total reflective mirror, a laser gain medium, a laser output mirror and an astigmatism mode converter, the pumping source emits pumping light in a gain medium absorption band; the pump light is focused and then enters the gain medium; the gain medium absorbs the pump light and generates laser gain; the total reflective mirror highly reflecting laser wavelength and the output mirror partially transmitting the laser wavelength jointly form a simple linear resonant cavity. When the laser gain medium is inclined by a preset angle relative to the optical axis of the resonant cavity, meridian light and sagittal light pass through different optical paths of the gain medium to introduce astigmatism, an HG mode facing the directions of two astigmatism symmetry axes can be reproduced, and modes facing other directions cannot be reproduced due to the astigmatism effect. Therefore, when the pump light deviates from the axis of the resonant cavity in the directions of the two astigmatic symmetry axes, any high-order HG mode with mode ordinal numbers not being zero in the two directions can be excited, and any LG mode laser can be generated through astigmatic mode conversion.

The application discloses a particle counter, which comprises a pumping source for emitting first wavelength laser; the first wavelength laser emitted by the pumping source enters a laser resonant cavity; a laser crystal is arranged in the laser resonant cavity, and the laser crystal is irradiated by the first wavelength laser to form second wavelength laser, and the second wavelength laser forms light oscillation in the laser resonant cavity; a convex lens group comprises two convex lenses with the same focal length and arranged at intervals, the convex lens group is arranged between the pumping source and the laser resonant cavity, and the convex lens group focuses the first wavelength laser on the laser crystal; an aerosol generating device provides an aerosol airflow into the laser resonant cavity, and the aerosol airflow passes through the light beam of the second wavelength laser; and a photoelectric detection device detects the scattering light signal of the aerosol particles. The application can realize detection of dust particles with a particle size of 0.1 microns, and has the advantages of low power consumption, portability and high detection precision.

This invention discloses an optically pumped tunable vertical-cavity surface-emitting laser (VCSEL), a mirror, and their applications. The wavelength-selective mirror includes a phase-matching region and an optimization region arranged sequentially along the vertical direction. The phase-matching region is formed by periodically alternating stacks of x pairs of first high-refractive-index material layers and first low-refractive-index material layers along the vertical direction. The optimization region is formed by y pairs of second high-refractive-index material layers and z pairs of second low-refractive-index material layers, which are alternately stacked along the vertical direction, and the optical thicknesses of the second high-refractive-index material layers and the second low-refractive-index material layers are unequal. This invention breaks away from the traditional single optimization paradigm centered on lasing light in DBRs, significantly improving optical pumping efficiency while ensuring a wide tuning range and free spectral range, thereby realizing a highly efficient wide-tunable single-longitudinal-mode output MEMS-VCSEL, laying the foundation for next-generation high-performance tunable lasers.

Disclosed herein are optical amplifier devices, optical amplifier assembly, and optical amplifier systems. Example embodiments may include: a plurality of input optical ports, each being configured to receive one of a plurality of input optical signals; a plurality of output optical ports, each being configured to output one of a plurality of output optical signals; a plurality of tap photodiodes, each respectively being connected to one of the plurality of input optical ports and the plurality of output optical ports; a wavelength division multiplexer configured to receive the input optical signal from each of the plurality of input optical ports and an optical input from a laser pump device and output a plurality of pumped optical signals; a plurality of erbium-doped fiber coils, each having a first end configured to receive one of the plurality of pumped optical signals and a second end configured to output an amplified optical signal; and an optical isolator configured to receive, for each of the plurality of erbium-doped fiber coils, the amplified optical signal and output the plurality of output optical signals, wherein the plurality of output optical ports are configured to receive one of the plurality of output optical signals.

The application discloses a multimode laser, a pump laser, an optical amplifier and a communication system, and relates to the field of optoelectronic communication. The multimode laser comprises a shell, a laser unit, a first collimating assembly, a wavelength selection reflection assembly and a second collimating assembly and an output tail fiber located in the shell. The laser unit is used for outputting pump light of a first wavelength to the first collimating assembly. The pump light can be transmitted along a first path or a second path. The first path is composed of the first collimating assembly, the wavelength selection reflection assembly, the second collimating assembly and the inner cladding of the output tail fiber. The second path is composed of the first collimating assembly, the second collimating assembly, the wavelength selection reflection assembly and the inner cladding of the output tail fiber. The wavelength selection reflection assembly is used for reflecting signal light of a second wavelength output by the core of the output tail fiber. The second wavelength is greater than the first wavelength. The embodiment of the application can solve the problem that the maximum output power of the optical amplifier is limited.

The application discloses a kind of optical element surface thermosensitive defect nondestructive testing system and method, wherein optical element surface thermosensitive defect nondestructive testing system includes optical coherence tomography device, laser pumping device and signal processing and control module.The above technical scheme is used to a kind of optical element surface thermosensitive defect nondestructive testing system and method, utilizes laser pumping cooperation optical coherence tomography, realizes the rapid detection to optical element surface thermosensitive defect, possesses fast, nondestructive, micron level high-resolution structure imaging, nanometer level high-precision phase detection and so on Advantage, break through the technical bottleneck of traditional thermosensitive defect detection means " detection precision and detection efficiency cannot be obtained simultaneously ", simultaneously can gather the three-dimensional structure image and phase information of optical element, so as to obtain the accurate three-dimensional position information of thermosensitive defect in optical element including depth position information.

This invention relates to the field of wafer parameter testing technology, and discloses a spatially resolved non-destructive testing method for the electrical parameters of semiconductor wafers based on optical pump-terahertz probe spectroscopy. The method includes: generating pulsed light using an ultrafast laser; splitting the pulsed light into pump light and terahertz probe light using a beam splitter; focusing the pump light and terahertz probe light onto the same measurement position on the surface of the semiconductor wafer under test; reconstructing the carrier relaxation dynamics curve at this measurement position; obtaining the dynamic parameters and transient conductance changes related to the wafer carrier recombination process; acquiring the electrical parameters of the semiconductor wafer under test at different measurement positions and generating a two-dimensional spatial distribution map of the electrical parameters of the semiconductor wafer under test; and identifying abnormal regions of electrical parameters on the surface of the semiconductor wafer under test. This invention enables high spatial resolution, rapid, and comprehensive detection of the electrical parameters of semiconductor wafers without damaging the wafer surface structure and electrical properties through non-contact optical means.

This invention relates to the field of laser technology, and particularly to a Raman laser that outputs 9.2μm far-infrared laser light. It includes a laser pump beam splitting module, a first-order Raman laser generation module, a difference-frequency seed light preparation module, a laser beam combining and tuning module, a second-order Raman amplification module, and a laser collimation and separation module arranged sequentially along the optical path. The laser pump beam splitting module is used to achieve beam splitting and control of the 1064nm laser; the first-order Raman laser generation module is used to generate a 1.9μm first-order Raman laser from hydrogen; the difference-frequency seed light preparation module is used for difference-frequency preparation of the 9.2μm Raman seed light; the laser beam combining and tuning module is used for spatiotemporal overlap and beam combining of the pump light and the seed light; the second-order Raman amplification module is used for Raman amplification of the 9.2μm laser; and the laser collimation and separation module is used for collimation and separation of the target laser output. This invention utilizes a difference-frequency method to generate wavelength-matched far-infrared Raman seed light, and performs Raman amplification to ultimately obtain a 9.2μm far-infrared Raman laser with high pulse energy and high peak power.

[Problem] To achieve high output and stable operation in a semiconductor laser-pumped solid-state laser which is provided with an optical wavelength conversion element for converting two solid-state laser oscillation lights into sum frequency. [Solution] An LD-pumped solid-state laser (1) includes: a solid-state laser crystal (19) such as a Pr:YLF crystal; an LD (11) that emits excitation light (L) for pumping the laser crystal (19); and a resonator that resonates the light emitted from the solid-state laser crystal (19). The LD-pumped solid-state laser comprises a wavelength control means, such as a narrow bandpass filter (13), for substantially matching the oscillation wavelength of the excitation light (L) from the LD (11) with the absorption peak wavelength of the solid-state laser crystal (19).　

One technical solution of this invention provides a method for controlling the laser source of a miniaturized atomic magnetometer, characterized by the following steps: a pump laser emitted from a VCSEL diode strikes a photodiode to generate a current; the voltage converted from the current output by the photodiode is used as a temperature adjustment reference for the VCSEL diode; the temperature of the VCSEL diode and the magnitude of the converted voltage are collected in real time, and the temperature of the VCSEL diode is PID-regulated using a heating system. Another technical solution of this invention provides a control system for the laser source of a miniaturized atomic magnetometer. This invention proposes a method for determining whether the wavelength is stable at a target value using the converted voltage of the photodiode, utilizing the physical phenomenon of optical pumping to control laser frequency stabilization.

A VCSEL-pumped uniform-field cavity (VPUFC) includes a substrate, one or more vertical cavity surface emitting lasers (VCSEL) bonded to the substrate and a heat sink wafer disposed proximate an emitting surface of the VCSEL. The one or more VCSEL is disposed between the substrate and the heat sink wafer. A uniform field cavity (UFC) is optically coupled to the VCSEL(s) through the heat sink wafer, which is disposed between the VCSEL(s) and UFC. The one or more VCSEL is configured to optically pump the UFC.

The application discloses a CPT atomic clock applied to the field of atomic frequency standards. The CPT atomic clock comprises a VCSEL, a 1 / 4 lambda wave plate, a lens and an optical cavity, wherein the VCSEL is used for generating laser required for optical pumping of the CPT atomic clock; the lens and the optical cavity are arranged between the VCSEL and the 1 / 4 lambda wave plate; the lens is arranged on the side close to the VCSEL and is used for converging the laser emitted by the VCSEL into Gaussian light; the optical cavity is arranged on the side close to the 1 / 4 lambda wave plate; and the inner surface of the cavity mirror of the optical cavity comprises a reflecting mirror and is used for adjusting the amplitudes of different frequencies in the laser signal to eliminate high-order sidebands. That is, the reflecting mirror of the optical cavity can be used for adjusting the amplitudes of different frequencies in the optical signal, eliminating the high-order sidebands, simultaneously attenuating the carrier and the +1 order (or -1 order) sideband to the same amplitude, and used for interacting with alkali atoms to generate the coherent population trapping effect, so that the signal-to-noise ratio of the frequency discrimination signal can be improved.

This application relates to a differential detection device and method for rubidium isotopes in a single probe of an optically pumped magnetometer, belonging to the field of optically pumped magnetometer technology. The device includes: a laser module, a single atomic gas cell, a magnetic field modulation module, a photoelectric detection module, and a signal processing module. The laser module is used to split a tunable narrow-linewidth laser into two laser beams via a beam splitter, and then combine the two laser beams into a coaxial beam that is incident on the single atomic gas cell. The single atomic gas cell is filled with a mixture of rubidium-85 and rubidium-87 vapor and a buffer gas. The magnetic field modulation module is used to apply a static bias magnetic field and a high-frequency modulated magnetic field to the single atomic gas cell, causing the rubidium isotopes to undergo Zeeman level splitting. The photoelectric detection module is used to collect the light intensity signals corresponding to the two laser beams emitted from the single atomic gas cell. The signal processing module is used to receive the electrical signal converted by the photoelectric detection module, perform differential processing based on the Zeeman resonance signal, and obtain the corrected magnetic field measurement value.

A laser pumping method includes pumping a gas laser medium in a laser chamber by heating electrons in the gas laser medium with electromagnetic radiation from an electromagnetic source, resulting in populating the upper laser level. Electron density in a plasma formed in the gas laser medium is generated and controlled with an electron source that is internal or external to the laser chamber. A high-power excimer laser includes a laser chamber containing a high-power gas laser medium, a pulsed electromagnetic source configured to heat free electrons in the laser medium and thereby generate laser emissions from the gas laser medium, and a pulsed electron source configured to generate free electrons and control the electron density in the gas laser plasma medium.

This terahertz information metasurface with full-space spatial-frequency cross-domain coding solves the problem of how to effectively utilize electromagnetic resources throughout space to achieve ultrafast real-time switching between transmission and reflection states, belonging to the field of electromagnetic metamaterials. This application includes arrayed metasurface sub-units, which, from top to bottom, consist of a first frequency coding layer, a second dielectric layer, a third metal layer, a fourth dielectric layer, and a fifth transmission-reflection control layer. Real-time switching between reflection and transmission modes is achieved by controlling the conductivity state of photosensitive silicon in the fifth transmission-reflection control layer through wireless optical pumping. In reflection mode, the metasurface sub-units achieve frequency domain coding by regulating the excitation distribution of photosensitive silicon material in the first frequency coding layer; in transmission mode, the metasurface sub-units achieve spatial domain coding by regulating the excitation distribution of photosensitive silicon material in both the first and fifth transmission-reflection control layers, truly realizing cross-domain collaborative modulation at the full-space level.

This invention provides an optically pumped semiconductor laser and its fabrication method. The optically pumped semiconductor laser includes a semiconductor gain chip, a first heat sink, and a second heat sink. The semiconductor gain chip includes an active layer, a first light-transmitting heat dissipation structure, a second light-transmitting heat dissipation structure, a first film system, and a second film system. The first and second light-transmitting heat dissipation structures are located on opposite sides of the active layer along a first direction. The first film system is located on the surface of a portion of the first light-transmitting heat dissipation structure facing away from the active layer. The second film system is located on the surface of a portion of the second light-transmitting heat dissipation structure facing away from the active layer. The first heat sink is located on the side of the first film system facing away from the active layer and is also located on the side of the first film system along a second direction. The second heat sink is located on the side of the second film system facing away from the active layer and is also located on the side of the second film system along a second direction.

The present disclosure discloses a kind of laser and method based on cavity emptying group realizes pulse group laser output, in the laser: fast photoelectric detector, first all-reflection mirror, electro-optic switch, quarter-wave plate, polaroid, gain medium, second output mirror are sequentially placed from left to right;Pump source is placed below the gain medium, for using the pump light emitted by it to pump the gain medium, so that gain medium realizes enough particle number inversion;Electro-optic switch voltage waveform controller is electrically connected with the electro-optic switch, for the electro-optic switch power supply, control the voltage of electro-optic crystal inside the electro-optic switch, the electro-optic switch voltage waveform controller is also connected with the fast photoelectric detector, for receiving the electrical signal generated by the fast photoelectric detector, after this signal triggers electro-optic switch voltage waveform controller, output multiple high level as quarter-wave electro-optic crystal voltage square wave signal.

This invention discloses a semiconductor quantum dot, a method for preparing a single-photon source, and a quantum signal detection system. The method prepares InAs / GaAs quantum dots using molecular beam epitaxy in the Stranski-Krastanow mode, and then combines the prepared semiconductor quantum dots with a microcavity to form a single-photon source. The quantum signal detection system includes a semiconductor quantum dot single-photon source, a laser pump source, a wavelength division multiplexing (WDM) fiber, and an HBT interferometer. The input end of the WDM fiber is connected to the laser pump source, and the output end is connected to the HBT interferometer. Laser light excited by the laser pump source is perpendicularly irradiated onto the surface of the semiconductor quantum dot single-photon source through the WDM fiber, causing electrons to transition to an excited state and radiate recombination to emit photons. After emission, the quantum dot emits light, which is then collected at the end face of the same fiber. The HBT interferometer measures the output signal. This invention allows for the adjustment of the luminescence properties by doping with appropriate metal elements, enabling precise detection of the single-photon signal output from the quantum dot single-photon source.

This invention relates to an electromagnetic field scanning system for diamond NV centers based on heterodyne detection, belonging to the field of microwave quantum detection technology. It includes a laser pumping module, a fluorescence collection module, a microwave pumping module, a magnetic field control module, and a scanning detection module. The laser pumping module generates a laser to excite the diamond NV centers to emit fluorescence signals. The microwave pumping module generates an injection microwave signal and a reference microwave signal with similar frequencies. The injection microwave signal is injected into the microwave radiation device under test to generate the microwave signal to be measured. The reference microwave signal and the microwave signal to be measured generate a heterodyne mixing signal. The magnetic field control module applies a static magnetic field to the diamond, enabling the diamond NV centers to resonate with the microwave signal to be measured and emit fluorescence response signals. The fluorescence collection module collects the fluorescence signal and obtains the spectrum, which is sent to the control unit. The control unit calculates the microwave signal to be measured based on the spectrum information. This invention solves the problem of the lack of a system solution for applying heterodyne detection to the detection of diamond NV centers in the prior art.

The application provides a kind of laser pumping automatic testing device and method, including three kinds of measuring functions of divergence angle, wavelength and power, wherein divergence angle value measurement adopts measurement head to rotate swing in light beam path and records and calculates light intensity distribution point by point, finally calculates NA value;Wavelength is measured by integrating the spectrometer probe inside the integrating sphere;Power is indirectly measured by integrating photodiode inside the integrating sphere.The laser pumping automatic testing device is composed of stock bin, first storage station, second storage station, laser beam divergence angle measuring mechanism, water wiping mechanism, wavelength and power testing mechanism, and discharge bin.The laser pump is fixed inside the customized fixture, and the double-head manipulator completes the automatic production conversion of pump source between each station by carrying the fixture.The laser pumping automatic testing device provided by the application can realize the automatic testing of three kinds of measuring functions of laser divergence angle, wavelength and power, and has high testing precision.

An optical arrangement includes a laser-active solid body configured to amplify and / or generate a laser beam. The laser-active solid body is in a form of a slab. The optical arrangement further includes a pump radiation source configured to generate a pump beam that propagates in a propagation direction and passes through the laser-active solid body for optical pumping the laser-active solid body, and a reflector arranged downstream of the laser-active solid body in the propagation direction of the pump beam. The reflector is configured to reflect the pump beam transmitted through the laser-active solid body back onto the laser-active solid body. The pump beam reflected by the reflector passes through the laser-active solid body for optical pumping the laser-active solid body.

This application relates to the field of hyperspectral imaging technology, specifically to an imaging device and imaging method. The imaging device includes: an infrared light receiving unit, a pump light source, a wavelength tuning up-conversion unit, and a visible light detection unit; wherein the infrared light receiving unit is used to collect infrared light; the pump light source is used to generate pump light that undergoes frequency up-conversion with the infrared light; the wavelength tuning up-conversion unit is disposed in the optical path of the infrared light and the pump light to receive the infrared light and the pump light, and is configured to change the positions of the infrared light and the pump light within the wavelength tuning up-conversion unit, so that infrared light of different wavelengths satisfies the quasi-phase matching condition and undergoes frequency up-conversion with the pump light, thereby generating visible light of different wavelengths; the visible light detection unit is disposed in the optical path of the visible light; this imaging device utilizes the wavelength tuning up-conversion unit to perform frequency up-conversion of infrared light of different wavelengths, simplifying the optical path and improving system integration and reliability.

This invention relates to the field of organic photonics and laser device technology, specifically disclosing a laser based on a mesoporous titanium dioxide substrate and its fabrication method. The laser comprises a transparent substrate, a mesoporous titanium dioxide thin film on the substrate, and an organic conjugated polymer gain medium layer on the titanium dioxide thin film. The mesoporous titanium dioxide layer is fabricated by spraying or spin coating, utilizing its disordered porous structure to provide light scattering feedback. Low-threshold random laser emission can be achieved under optical pumping without the need for a traditional precision resonant cavity. This device features a simple structure, low fabrication cost, good process compatibility, and applicability to polymer gain media with various emission wavelengths, providing a new technical path for realizing low-cost, easily integrated electrically pumped organic lasers.

This semiconductor laser-pumped solid-state laser, equipped with an optical wavelength conversion element that converts the light emitted from two solid-state lasers into a sum frequency, achieves high output and stable operation. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19 such as a Pr:YLF crystal, an LD 11 that emits excitation light L to excite the laser crystal 19, and a resonator that resonates the light emitted from the solid laser crystal 19, wavelength control means such as a narrow-band bandpass filter 13 is provided to make the oscillation wavelength of the excitation light L from the LD 11 substantially match the absorption peak wavelength of the solid laser crystal 19.

This invention relates to a flexible nanolaser and its fabrication method. The flexible laser nanolaser comprises a flexible polymer cladding layer and a dielectric material waveguide layer. The flexible polymer cladding layer is a flexible polymer substrate with a flexible polymer hole array. The dielectric material waveguide layer comprises a top dielectric material thin film layer and a dielectric material pillar array structure filling the holes in the flexible polymer hole array. In this invention, the flexible laser nanolaser is excited by optical pumping, generating guided mode resonance in the dielectric material waveguide layer, thereby amplifying the light and ultimately generating laser light. The flexible nanolaser of this invention has good bending resistance and can still function normally after deformation under stress, and can be applied to fields such as bio-implantable detection, flexible optoelectronic integrated devices, and wearable mechanical interaction devices.

A fiber amplifier is provided, including a pump laser (202), a pump and signal combiner (203), and a few-mode doped fiber (204). The pump laser (202) is configured to output pump light. The pump and signal combiner (203) is configured to couple input few-mode signal light and the pump light into the few-mode doped fiber (204). Refractive indexes of a fiber core of the few-mode doped fiber (204) are distributed to be gradient along a radial direction of a cross section, the fiber core is etched with periodic gratings along an axial direction, and periods of the gratings satisfy a phase matching condition. The fiber amplifier achieves strong coupling and co-amplification between optical signal modes, thereby reducing a differential gain between mode groups.

The application discloses a kind of based on single radio frequency magnetic field three-axis magnetic field measurement method and system, the three-axis magnetic field measurement method includes applying single radio frequency magnetic field and control pre-acquired linearly polarized light is carried out optical pumping to atomic gas chamber, to obtain the double-axis parameter resonance optical signal of the magnetic field to be measured according to polarized atomic gas chamber, to obtain the first axis magnetic field component information and the second axis magnetic field component information of the magnetic field to be measured;Compensating magnetic field is applied to polarized atomic gas chamber, and compensated atomic gas chamber is obtained;Bias magnetic field is applied to compensated atomic gas chamber, and bias atomic gas chamber is obtained, to obtain the third axis parameter resonance optical signal of the magnetic field to be measured;Third axis parameter resonance optical signal is demodulated, and the third axis magnetic field component information of the magnetic field to be measured is obtained, and then the first axis magnetic field component information and the second axis magnetic field component information are combined to obtain the three-axis magnetic field component information of the magnetic field to be measured, to realize high sensitivity three-axis vector measurement based on single radio frequency magnetic field in the system of simplified structure.