297 results about "Optical pumping" patented technology

The invention provides a global magnetic disturbance compensation method in aviation magnetic survey. The method comprises the following steps: S1, performing high-altitude calibration flight through a motion platform, and acquiring total magnetic field data based on detection data of an optical pump magnetometer; s2, obtaining geomagnetic background gradient information and obtaining geomagnetic field data based on the geomagnetic background gradient information; s3, obtaining motion platform magnetic interference data according to the total magnetic field data and the geomagnetic field data; s4, motion platform attitude information, motion platform current information and fluxgate magnetometer detection data are acquired; s5, obtaining a motion platform magnetic interference coefficient according to the motion platform magnetic interference data, the motion platform attitude information, the motion platform current information and the fluxgate magnetometer detection data; and S6, according to the geomagnetic background gradient information and the motion platform magnetic interference coefficient, performing data compensation on the total magnetic field data in real time during actual aviation magnetic measurement.

The invention provides a quasi-continuous thulium-doped fiber laser capable of synchronously suppressing relaxation oscillation and self-pulse, relates to the technical field of fiber laser, and is used for simultaneously realizing suppression of a self-pulse effect and a relaxation oscillation peak. Comprising a continuous driving module, a pulse driving module, a semiconductor laser pumping source, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a beam combiner, a thulium-doped gain fiber, a passive fiber, a cladding pumping stripper and a laser output port, the continuous pump light and the pulse pump light are respectively driven by the continuous driving module and the pulse driving module to output continuous pump light and pulse pump light; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating form a resonant cavity structure, the thulium-doped gain fiber serves as a gain medium of the thulium-doped fiber laser and absorbs pump light to generate population inversion, laser oscillation is formed by combining the resonant cavity of the laser, relaxation oscillation suppression is achieved, and meanwhile longitudinal mode distribution of the laser is effectively disrupted.

The invention provides a self-excited cesium optical pump atomic magnetometer and a magnetic field measurement method. The magnetometer comprises a physical probe part and a circuit part. The physical probe part comprises a cesium spectrum lamp, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a phase-locked amplification circuit and a radio frequency excitation circuit modulated by square waves. A macroscopic magnetic moment is generated by pumping cesium atoms through left-handed circularly polarized light, a radio frequency magnetic field induces Larmor precession, light intensity changes are detected and fed back to a radio frequency coil to form self-oscillation, and the external magnetic field intensity is calculated according to the linear relation between oscillation frequency and the magnetic field. Square wave modulation is adopted to broaden the measurement bandwidth, a magnetic field direction adjusting system is additionally arranged to automatically keep an angle of 45 degrees between an optical axis and a magnetic field so as to eliminate a blind area, the hemisphere automatic switching function is achieved, and the advantages of being high in sensitivity, fast in response, high in adaptability, small in size and low in power consumption are achieved.

The invention discloses a 2-micron-waveband adjustable all-fiber high-repetition-frequency pulse light source generator, belongs to the technical field of laser light source manufacturing, and aims to solve the problem that an existing 2-micron-waveband passive all-fiber mode-locked pulse laser light source is difficult to give consideration to fs-magnitude narrow pulse width and ultra-short-cavity-length high-fundamental-frequency repetition frequency output. The laser comprises a semiconductor laser pumping source, a wavelength division multiplexer, an extrusion type polarization controller I, a polarization-maintaining highly-doped gain fiber, an extrusion type polarization controller II, a long cone region tapering micro-nano fiber, a 2 * 2 fiber coupler and a fiber Faraday mirror. According to the invention, the long-cone micro-nanofiber is introduced into the cavity, and the long-cone micro-nanofiber has the characteristic of high nonlinear coefficient, so that the cavity length can be greatly shortened, enough nonlinear phase shift can be accumulated, and fs-magnitude ultrashort pulse can be output. The device is low in loss, stable in performance and easy to integrate with other optical fiber systems. The laser can be applied to the fields of optical communication, non-metallic material processing, laser medical treatment, intermediate infrared laser pumping sources and the like.

The invention relates to a power-on loading or interchange self-adaption method for a cesium optical pump magnetometer, belongs to the technical field of quantum sensing and geomagnetic detection, and solves the technical problem that the excitation process is tedious during power-on loading or interchange of the cesium optical pump magnetometer in the prior art. Based on the current standard radio frequency power voltage and the standard radio frequency frequency voltage, hopping radio frequency power voltage is applied to the cesium lamp, and the cesium lamp is lightened through the hopping radio frequency frequency voltage; increasing the radio frequency power voltage to a first interval range to heat the cesium lamp, and applying a standard radio frequency frequency voltage until the cesium lamp is preheated; when the collected working voltage of the cesium lamp starts to be reduced, reducing the radio frequency power voltage to standard radio frequency power; and the radio frequency power voltage and the radio frequency frequency voltage are finely adjusted, so that the magnetometer outputs a Larmor signal with a stable waveform, and the radio frequency frequency voltage, the radio frequency power voltage and the cesium lamp working voltage at the moment are stored as optimal working points of the magnetometer. And a self-adaptive power-on loading or interchanging method of the cesium optical pump magnetometer is realized.

A multimodal fusion detection apparatus and method based on optical pumping and photoacoustic imaging are provided, relating to the field of fusion detection technology. In the apparatus, the atomic vapor cell detection path and the first laser irradiation path are both directed toward a target region and at least partially overlap. In this way, the detection paths of optical pumping and photoacoustic imaging are at least partially coincident, ensuring that electrophysiological signals and blood oxygen signals originate from the same tissue region and avoiding the spacing constraints of conventional sensors. Thus, the detection path of the atomic vapor cell can be used for both magnetic field detection and photoacoustic detection, enabling simultaneous acquisition of magnetic and photoacoustic signals at a single detection point, achieving hardware reuse for multimodal fusion detection at the same location and time, reducing device size, and minimizing crosstalk among multimodal sensors.

The invention relates to the technical field of laser devices, in particular to a Brillouin semiconductor laser device which comprises a gain chip, a Brillouin semiconductor laser device and a Brillouin semiconductor laser device, a Bragg grating; a microring resonator; the beam splitter is located between the micro-ring resonator and the Bragg grating; wherein the gain chip is used for generating spontaneous radiation light, the Bragg grating and the high-reflection film form a resonant cavity, the spontaneous radiation light is processed by the resonant cavity to form pump light, the pump light is injected into the micro-ring resonator through a second end of the Bragg grating, the micro-ring resonator generates a stimulated Brillouin scattering effect to generate Stokes light, and the Stokes light is transmitted to the high-reflection film. The micro-ring resonator carries out mode selection amplification on the Stokes light, ultra-narrow linewidth Brillouin laser is output from the first end of the micro-ring resonator, and the beam splitter outputs the ultra-narrow linewidth Brillouin laser according to a preset proportion. According to the Brillouin semiconductor laser, the integration level and the compactness of the Brillouin semiconductor laser are improved while it is guaranteed that the Brillouin semiconductor laser has excellent performance.

The embodiment of the invention provides an aviation gravity and magnetic vector dynamic measurement method based on multi-source data synchronous fusion, and relates to the technical field of data acquisition, after sensor array data on a driving flight platform is acquired, a specific force measurement value, a carrier pitch angle, a carrier roll angle and a carrier motion parameter are calculated and output; calculating three output gravity disturbance components by adopting carrier motion parameters and specific force measurement values; fusing total field data of the optical pumping magnetometer to carry out magnetic vector calculation on three-component data of the fluxgate and outputting geomagnetic total elements; and taking a carrier pitch angle, a carrier roll angle, a carrier position, a carrier speed and a carrier course angle as carrier pose data, combining the geomagnetic total elements and the carrier pose data, and outputting a dynamic measurement result of the gravity-magnetic vector field. The problems that in the prior art, gravity measurement and magnetic measurement are separated, equipment redundancy is low in efficiency, collection time is asynchronous, and data precision is reduced are solved. The effect of high-precision, high-dynamic and high-efficiency synchronous acquisition of the gravity and magnetic vector data under the single platform is achieved.

A pump light generation unit of an optical amplifier pumping device outputs pump light with a single wavelength or a plurality of wavelengths from a plurality of output ports. A pump light multiplexing unit polarization-multiplexes or wavelength-multiplexes the plurality of pieces of pump light which has been output from the pump light generation unit. A polarization scrambler collectively polarization-scrambles the polarization-multiplexed or wavelength-multiplexed pump light which has been output from the pump light multiplexing unit and outputs the polarization-scrambled pump light to an optical waveguide for pump light. The optical waveguide for pump light inputs the pump light which has been polarization-multiplexed or wavelength-multiplexed by the pump light multiplexing unit to the pump light superimposition unit. A pump light superimposition unit multiplexes the polarization-multiplexed or wavelength-multiplexed pump light and signal light. A pump light output port superimposes the pump light on the signal light by outputting the pump light from the pump light superimposition unit to the gain medium so that the pump light propagates in the same direction as the signal light.

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.

The invention discloses a laser pumping source protection device and an optical fiber laser. The laser pumping source protection device comprises a laser pumping device, a pumping source isolator, a pumping source protector, a high-reflectivity grating group, an optical fiber beam combiner, a seed source, an active optical fiber and a signal optical isolator. Wherein the pumping source isolator, the pumping source protector and the high-reflection grating group are sequentially arranged along a laser propagation path, so that medium-frequency-band reverse light is blocked by the pumping source isolator, low-frequency-band reverse light is inhibited by the pumping source protector, and high-frequency-band reverse light is reflected by the high-reflection grating group. The seed source is used for transmitting signal light, the optical fiber beam combiner is used for coupling the signal light and pump light, the active optical fiber is used for exciting doped ions and amplifying the signal light, and the signal light isolator is used for isolating the signal light in the coupled light. According to the device, the three different optical suppression elements are used for blocking or reflecting the reverse light of different wavebands to form three-level protection, so that the reliability of the laser is improved, and the service life of the laser is prolonged.

The invention discloses an erbium-doped aluminum oxide and silicon nitride heterogeneous integrated on-chip optical amplifier and an integration method thereof. The amplifier is composed of a straight waveguide, an interlayer coupling waveguide and a bent waveguide. The erbium-doped aluminum oxide-silicon nitride heterogeneous integrated waveguide is formed by adopting the processes of low-pressure chemical vapor deposition, plasma enhanced chemical vapor deposition, oxidation and etching, radio frequency reaction magnetron sputtering, chemical mechanical polishing and the like. According to the structure, signal light pump light is transmitted in the silicon nitride waveguide with the small mode field area in the bent waveguide, so that the compactness of the device is ensured; signal light pump light is coupled into an aluminum oxide strip waveguide with a large mode field area in a straight waveguide area, so that mode field overlapping of 980nm pump light and 1550nm pump light is improved, and amplification of the large mode field area is realized. According to the invention, large-mode-area on-chip optical waveguide amplification of 980nm pump light pumping is realized, and the large-mode-area on-chip optical waveguide amplification device has a wide application prospect in the field of integrated photoelectronics and the field of optical communication.

The invention relates to the technical field of lasers, in particular to a Brillouin hybrid integrated laser, which comprises a gain chip; the Bragg grating is connected with the first cavity surface; the first end of the micro-ring resonator is connected with the second cavity surface; the beam splitter is located between the micro-ring resonator and the gain chip; wherein the gain chip is used for generating spontaneous radiation light, the Bragg grating and the low-reflection film form a resonant cavity, the spontaneous radiation light is processed by the resonant cavity to form pump light, the pump light is injected into the micro-ring resonator through the second cavity surface, the micro-ring resonator generates a stimulated Brillouin scattering effect to generate Stokes light, and the Stokes light is transmitted to the Bragg grating and the low-reflection film. The micro-ring resonator performs mode selection amplification on the Stokes light and outputs ultra-narrow linewidth Brillouin laser, and the beam splitter outputs the ultra-narrow linewidth Brillouin laser according to a preset proportion. According to the Brillouin hybrid integrated laser, the integration level and the compactness of the Brillouin hybrid integrated laser are improved while it is guaranteed that the Brillouin hybrid integrated laser has excellent performance.

The application discloses a method for improving low-frequency precision of an atomic magnetometer, and relates to the technical field of weak magnetic detection. In the method, the closed-loop atomic magnetometer is in a zero-locking state, a direct-current bias system is automatically and accurately adjusted, the atomic magnetometer is caused to work in a critical interval between a zero-locking region and a linear region, the zero-locking region has the suppression on low-frequency magnetic noise, and the linear region has a higher response to a measured magnetic field, so that the low-frequency measurement precision of the atomic magnetometer is improved. The application is suitable for an optical pumping atomic magnetometer system, and is favorable for improving the precision and stability of the atomic magnetometer, and can significantly improve the magnetic field sensitivity in the low-frequency part.

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 utility model belongs to the technical field of cesium optical pump magnetometers, and particularly relates to a split type cesium optical pump magnetometer, which comprises a data acquisition and processing module, and is characterized in that a connecting line I is mounted on the surface of one side of the data acquisition and processing module, and an electronic component module is mounted at one end, far away from the data acquisition and processing module, of the connecting line I; a second connecting line is installed on the surface of the side, away from the first connecting line, of the electronic assembly module. The components of the device adopt a split design, are connected through a connecting line, are convenient to install on an unmanned aerial vehicle, can simultaneously collect by a plurality of cesium optical pump probes, have the characteristics of high sensitivity, good stability, high precision and the like, can separate cesium optical pump signal generation from signal conversion, and can connect a plurality of cesium optical pump signal units by using one signal conversion unit. The method achieves the centralized transmission and control of cesium optical pump data, and plays an important role in the fields of military affairs, geophysical exploration and the like.

This invention discloses a non-equilibrium optical pump source with a rise time on the order of nanoseconds to sub-nanoseconds and its operating method. This invention integrates a collimating mirror, a reflecting mirror, a beam splitter, a light-absorbing plate, a hemispherical mirror, an aperture, a converging lens, a high-speed motor, a turntable, and a diffuse reflection assembly to obtain a non-equilibrium optical pump source with a rise time on the order of nanoseconds to sub-nanoseconds. By reducing the spot size, increasing the rotation speed, and increasing the turntable diameter, the signal rise time can be compressed to the order of nanoseconds to sub-nanoseconds. This effectively solves the problem of inaccurate time constant measurement caused by the excessively long rise time of the output signal of traditional mechanical choppers when measuring the response time of fast infrared detectors using the frequency descent method, thus achieving high-precision measurement of the infrared detector time constant.

The invention discloses an active mode demultiplexing module which comprises a mode converter, two optical circulators and a bidirectional semiconductor optical amplifier. The mode converter is used for converting a high-order mode into a fundamental mode to complete primary mode demultiplexing, fundamental mode signals after primary demultiplexing are injected into the bidirectional semiconductor optical amplifier through the two optical circulators from the positive direction and the negative direction respectively, and the signals after being shaped by the bidirectional semiconductor optical amplifier are output by the corresponding optical circulators. A bidirectional symmetrical injection structure is formed, different propagation is beneficial to separation of different signals, and mutual interference, namely mode crosstalk, between forward and reverse signals can be effectively reduced, so that a mode demultiplexing function is better completed, and an output signal has higher signal quality than a primary demultiplexing signal. Besides, by optimizing and adjusting the driving current of the bidirectional semiconductor optical amplifier or an auxiliary optical pumping mode, not only can the gain of the mode channel be dynamically adjusted, but also the power balance of the mode channel and the demultiplexing of a high extinction ratio mode can be realized; the method is especially suitable for receiving few-mode signals in a mode division multiplexing (MDM) optical transmission system and constructing optical switching nodes in a multi-dimensional multiplexing optical network.

The application discloses a dead-zone-free atomic magnetometer device and method based on pumping-detection information fusion and relates to the technical field of atomic magnetometers. Through optical-magnetic double-resonance pulse modulation, atoms can generate free precession signals in each magnetic field direction. In the spin polarization free precession stage, the output signals of pumping light and detection light are collected and detected, the dead zones of the output signals of the two light beams are complementary, one signal with a high signal-to-noise ratio is selected as an output through signal processing, and then a dead-zone-free high-sensitivity optical pumping atomic magnetometer is realized. The application realizes the full-range dead-zone-free atomic magnetometer without reducing the sensitivity of the magnetometer, and is helpful to the further application of the optical pumping atomic magnetometer in the field of space magnetic field measurement in the future.

The application discloses a kind of hollow light beam coherent array solid-state lasers, it is related to the technical field of laser, wherein, microstructure sheet and microstructure output layer adopt bonding mode connection;Array of hollow light field modulation structure is formed on microstructure sheet, pump source is used to emit pumping light, pump source and optical coupling system are relatively microstructure sheet and are matched to be set, so that pumping light can be coupled into microstructure sheet by optical coupling system, and hollow light beam array is formed by hollow light field modulation structure array;Hollow light beam array enters microstructure output layer by microstructure sheet, and forms coherent coupling and injection phase-locked in microstructure output layer, and outputs hollow light beam coherent array laser.Through the technical scheme of the application, high-power hollow light beam coherent array laser output can be obtained, and hollow light beam regulation is easy to realize, the scope of application is wide, and scalability is strong, and simple structure, low in cost, high in efficiency.

In at least one embodiment, the method is used to produce semiconductor lasers (1) and comprises the steps: - providing a plurality of laser emitters (2), at least one facet (22) of each of the laser emitters (2) being exposed, - electrically or optically pumping the laser emitters (2) such that the laser emitters (2) emit laser radiation (L), - generating a coating (3) on the facets (22), a local layer thickness (t) of the coating (3) over the facets (22) being determined by a local intensity of the laser radiation (L).

The invention discloses a solid-state laser of a spectrum beam combination semiconductor laser pump. The solid-state laser comprises a spectrum beam combination pumping source system, a pumping coupling system and a solid-state laser resonant cavity, pump light emitted by the spectrum beam combination pump source system is collimated and focused through the pump coupling system and then enters a gain medium of the solid laser resonant cavity, generated oscillation light of a first wavelength oscillates in the solid laser resonant cavity in a reciprocating mode, and laser output of a second wavelength is achieved. High-power pumping can be carried out on the gain medium under the condition that the quality of pumping laser beams is not reduced, the problem that the quality of the beams is poor in traditional semiconductor laser direct pumping is solved, and a research basis is provided for follow-up power improvement.

The invention belongs to the technical field of organic photoelectric semiconductor materials, and relates to a 2.7-bis (triphenylpyrimidine) fluorene compound and application thereof. The invention provides a 2.7-bis (triphenylpyrimidine) fluorene compound which has a linear symmetric structure, and the overall structure has high photoluminescence quantum efficiency and good film forming characteristics. The compound provided by the invention has the characteristic of amplified spontaneous emission, and can realize an extremely low ASE threshold value when being used as an optical gain medium. The 2.7-bis (triphenylpyrimidine) fluorene compound provided by the invention is easy to prepare and has a good application prospect in the fields of organic optical pump lasers and organic semiconductors.

The application discloses a kind of mid-infrared discrete time stretching spectrum method, its characteristics are as follows:1) prepare the double-color pulse light source with slightly different repetition frequency;2) the pulse of pulse light source 1 is output wavelength broadening and time stretching for the signal light of nonlinear difference frequency, and the pulse of pulse light source 2 is output power amplification, for the pump light of nonlinear difference frequency;3) the time-domain broadening spectrum optical sampling of signal light by pump light pulse, obtain the pulse sequence of mid-infrared discrete time stretching;4) mid-infrared discrete chirp pulse is measured through low bandwidth mid-infrared detector after passing through the sample to be measured, and absorption spectrum information is obtained.The application has the advantages of wide band, high speed and high resolution compared with prior art, and the measurement of mid-infrared spectrum is completed by means of low bandwidth single-point detector, without dispersion spectrometer element and mechanical scanning device, which solves the problem of lack of time and high dispersion time-domain stretching medium in mid-infrared band, and expands the application of time stretching technology in mid-infrared band.

The application discloses a kind of gas chamber polarization enhancement magnetometer based on multifocal holographic super surface and measuring method, belong to magnetic field measurement technical field.The magnetometer includes laser generation and control module, 1 / 4 wave plate, multifocal holographic super surface, optical magnetic resonance module, optical pumping signal post-processing module and reflector.Laser is collimated after 1 / 4 wave plate and is incident to multifocal holographic super surface, the super surface carries out phase control to incident light, makes multiple focal planes in different depths in gas chamber, improves the spatial uniformity of light pumping, enhances alkali atom polarization rate.Transmitted light enters optical pumping signal post-processing module, passes through polarizing beam splitter prism polarizing beam splitter prism, balanced differential detector and lock-in amplifier, extracts magnetic resonance signal and calculates magnetic field intensity.The application optimizes light pumping process, improves the stability and signal-to-noise ratio of magnetic measurement system, reduces measurement error, and is suitable for geomagnetic detection, biological magnetic signal detection and other high-sensitivity magnetic field measurement fields.

A method for atomic scalar magnetometry can include: (i) applying optical pumping to a vapor within a vapor cell; (ii) ramping off a pump power of the optical pumping over a time period; (iii) driving Rabi oscillations in the vapor by applying a microwave pulse sequence to the vapor, and (iv) determining a magnetic field strength by measuring frequency of the Rabi oscillations.

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 invention relates to a sensor head (4a-d) for a frequency analyzer (2a-d) comprising a crystal defect resonator (20a-d), an optical pump emitter (14) for exciting the crystal defect resonator (20a-d), a magnetic field unit (30) for generating a magnetic field with a magnetic field gradient along the crystal defect resonator (20a-d), an RF waveguide (22) and a radiation detector (10) for detecting luminescence radiation (42) from the crystal defect resonator (20a-d). To achieve easy manufacturability of the frequency analyzer (2a-d), it is proposed that the crystal defect resonator (20a-d) has a polycrystalline structure.

The utility model relates to the technical field of semiconductor lasers, and provides a light beam combining module, a semiconductor laser pumping source and a semiconductor laser. The light beam combining module comprises a steering compression assembly and a beam combining device, two kinds of displacement light beams which are not at the same horizontal height are generated through the steering compression assembly, and when the light beam combining module is applied to a pumping source, the expansion difficulty of the number of collimation light path groups can be reduced, so that a semiconductor laser module can introduce more inclined pumping light beams, and the pumping efficiency is improved. Therefore, even if the number of the collimation light path groups is increased, the possibility of forming beam combination in space is ensured, and the power potential of the semiconductor laser pumping source is greatly improved.

A degenerate four-wave mixing (DFWM) squeezed light apparatus includes one or more pump beams, a probe beam, a vapor cell, a repump beam, and a detector. The one or more pump beams includes an input power of no greater than about 150 mW. The vapor cell includes an atomic vapor configured to interact with overlapped pump and probe beams to generate an amplified probe beam and a conjugate beam. The repump beam is configured to optically pump the atomic vapor to a ground state and decrease atomic decoherence of the atomic vapor. The detector is configured to measure squeezing due to quantum correlations between the amplified probe beam and the conjugate beam. The one or more pump beams, the probe beam, and the repump beam are configured to generate two-mode squeezed light by DFWM with squeezing of at least 3 dB below shot noise.