429 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 near-infrared perovskite laser and a preparation method thereof. The near-infrared perovskite laser includes: a substrate; the perovskite gain dielectric layer is arranged on the substrate, a microcrystalline structure is formed on the perovskite gain dielectric layer, and the microcrystalline structure is a resonant cavity of the perovskite gain dielectric layer. The near-infrared perovskite laser provided by the invention can realize lasing under optical pumping at room temperature without adopting an additional resonant cavity, so that the device structure is greatly simplified, and the integration of the laser is improved; by regulating and controlling the components and the preparation process, the regulation of the lasing peak can be realized, the regulation precision is high, and the use requirements of multiple wavelengths can be met; a full-solution method can be adopted for preparation, the process is simple, and the cost is low.

The invention relates to a power correction method of an optical fiber laser, which comprises the following steps of: setting output power of the laser, and obtaining a power simulation curve; the laser is operated, N measured values of the output power of the laser are obtained, a power sampling curve is generated, and N is larger than or equal to 10; acquiring a power difference value between the power simulation curve and the power sampling curve; acquiring the compensation gain of the output power according to the power difference value; selecting a compensation mode according to the compensation gain; and correcting the working condition of the fiber laser according to the selected compensation mode so as to correct the output power of the fiber laser and reduce the error between the set power and the actual output power. Before long-term operation of the fiber laser, the deviation of the output power can be accurately identified, the working condition of the laser is correspondingly adjusted according to the compensation gain calculated by the power difference value, the method is executed regularly or as required, and the power of the fiber laser is stable after correction. The output power fluctuation caused by the influence of real-time factors such as return light and pump light in the optical fiber is avoided, and the method can correct the power of the optical fiber laser more accurately, stably and reliably.

The invention provides a phase-locked amplification system for enhancing the signal-to-noise ratio of ultrafast laser pumping-detection transient imaging. The system comprises a signal input module which is arranged on a pumping light path and a detection light path, wherein the signal input module comprises a light splitting plain film and an imaging objective lens which are arranged in sequence, wherein the centers of the light splitting plain film and the imaging objective lens are located on a first axis; the centers of the first reflector, the filter, the focusing lens and the camera are located on a second axis in sequence, and the camera is used for shooting light reflected by the sample to obtain a first signal; the reference acquisition module comprises a beam splitting piece and a second reflecting mirror, the beam splitting piece is arranged on the pumping light path, and a reference light path is shot through a camera to obtain a second signal; and the phase-sensitive detection module is used for calculating the first signal and the second signal to obtain a carrier distribution condition at a preset moment. According to the invention, low pumping measurement is realized, the service life of a sample is prolonged, and the problem of detecting weak pumping imaging signals submerged in system background noise is solved.

The invention relates to the technical field of lasers, in particular to an optical pumping fiber laser which comprises a greenhouse cavity with a transmission pumping light incident wall. The substrate is arranged in the greenhouse cavity and is parallel to the incident wall; the photon conversion layer is located on the surface, facing the incident wall, of the substrate, the photon conversion layer comprises a base layer and a plurality of light condensation units, the light condensation units are arranged on the surface of the substrate, and the base layer seals the light condensation units; the optical fiber comprises a main body part and two end parts, the main body part is spirally wound on the surface, away from the incident wall, of the substrate in a single-layer form, and the end parts are provided with resonant cavity mirrors; wherein the light gathering units are arranged above the main body part along the extension direction of the main body part, the pump light is transmitted into the greenhouse cavity from the incident wall, the base layer converts the pump light into fluorescent photons, the fluorescent photons are reflected in the greenhouse cavity, and the fluorescent photons are gathered to the side surface of the optical fiber through the light gathering units so as to pump optical fiber light. The invention is at least beneficial to improving the absorption efficiency of the optical pumping fiber laser on the pumping light.

The embodiment of the invention discloses a detection system which is used for eliminating the influence of pump light noise and accurately detecting a sample. According to the embodiment of the invention, the device comprises a light source assembly used for emitting probe light and pump light; the first light splitting assembly is used for receiving the pump light and splitting the pump light into pump signal light and pump reference light, and the pump signal light is used for inducing the optical characteristic change of the sample; the signal processing module is used for receiving detection signal light formed by the pumping reference light and the probe light entering a sample, the signal processing module comprises a first denoising assembly, and the first denoising assembly is used for eliminating pumping light noise in the detection signal light according to a pumping noise frequency domain of the pumping reference light; and the signal processing module is also used for determining the detection result of the sample according to the detection signal light after the pump light noise is removed.

The invention belongs to the technical field of perovskite nanocrystals, and particularly relates to a method and device for regulating and controlling the coherence process of perovskite nanocrystal excitons through a magnetic field. The method comprises the steps that incident light beams of pump light and detection white light pass through perovskite nanocrystals at low temperature, a magnetic field is applied in the light propagation direction, the linear polarization eigenstate in the perovskite nanocrystals is converted into the elliptic polarization eigenstate through the magnetic field, and the elliptic polarization eigenstate approaches the circular polarization eigenstate along with increase of the magnetic field; the beat frequency dynamic learning of the perovskite nanocrystal under circular polarized light pumping-detection is gradually weakened; under the pumping-detection of linearly polarized light, the beat frequency dynamic learning of the perovskite nanocrystal is gradually enhanced; the eigenstate and beat frequency dynamics of the perovskite nanocrystal are regulated and controlled by adjusting the magnetic field intensity. According to the method, the band edge exciton eigenstate of the perovskite nanocrystal is regulated and controlled by changing the magnetic field intensity, and the change of the band edge exciton eigenstate can cause the change of the coherent state dynamics process, so that the coherent state dynamics regulation and control of the perovskite nanocrystal can be realized by regulating the magnetic field intensity.

The invention discloses a beat frequency coding type multi-wavelength optical fiber laser ultrasonic detection positioning system, which comprises an optical pumping device, an optical acquisition device, a signal demodulation device and an optical fiber laser ultrasonic sensing array, and is characterized in that the optical fiber laser ultrasonic sensing array comprises at least three dual-polarization optical fiber lasers which are not distributed on the same straight line; and the dual-polarization fiber lasers are used for generating at least three paths of single-frequency dual-polarization laser under the excitation of the pump light, and each dual-polarization fiber laser has different beat frequencies and output wavelengths. The ultrasonic detection positioning system modulates and demodulates the frequency of each laser polarization beat frequency signal based on an ultrasonic signal, is high in sensitivity, does not need extra time division and wavelength division multiplexing modules, and greatly reduces the complexity of the system. The invention further discloses a demodulation method of the ultrasonic detection positioning system.

A method and system is provided for operating a quantum information processing (QIP) system, including a dual-space, single-species architecture for trapped-ion quantum information processing. An exemplary method of preparing the ions include i) applying a first optical beam to the plurality of ions to shelve at least a portion of the plurality of ions from a first state to a second state, ii) applying a second optical beam to the plurality of ions to deshelve the at least a portion of the plurality of ions from the second state to a third state, iii) applying a third optical beam to optically pump the at least a portion of the plurality of ions from the third state and to a fourth state, and iv) iteratively repeat i) to iii) to transition a remaining portion of the plurality of ions to the fourth state.

The invention relates to the technical field of laser amplification, and discloses a high-efficiency dye laser amplification technology, which comprises the following steps of using high repetition frequency ultrafast laser as a pumping source, and carrying out beam expansion and collimation on pumping light through a telescope system; the dye concentration is adjusted in real time through the microfluidic system, and the dye concentration is monitored in real time through the fluorescence detection system; a photonic crystal frequency doubling crystal is used for frequency doubling conversion; pumping light intensity, dye concentration and output power data are collected and subjected to standardization processing; performing data analysis and system parameter optimization through a deep learning model; and the temperature distribution of the laser amplifier is monitored and adjusted in real time by using an intelligent thermal management system. By integrating the high-repetition-frequency ultrafast laser pumping source and the telescope system, uniform beam expansion and collimation of light beams are realized, and the laser amplification efficiency and stability are remarkably improved. Compared with the prior art, the influence of uneven light spots on the amplification effect is effectively reduced, and the quality and consistency of output light beams are ensured.

The invention discloses a method for measuring the elasticity modulus of a semiconductor material, which comprises the following steps of: exciting the semiconductor material by using femtosecond laser pulse through an ultrafast laser pumping detection technology, enabling the material to generate thermoelastic pressure, transmitting the thermoelastic pressure into the material, and measuring the elasticity modulus of the semiconductor material by using detection pulses at different moments. And detecting the thermoelastic pressure transmission rate of the material, and finally calculating the elastic modulus of the semiconductor material according to the quantitative relationship between the elastic modulus and the thermoelastic pressure transmission rate. According to the measuring method, the optical area can be as small as micron dimension, so that the elasticity modulus of the micron-dimension semiconductor material can be tested. In addition, mechanical pressure does not need to be applied to the semiconductor material based on optical measurement, measurement of the elastic modulus of the material can be completed in a non-contact mode, and damage to the material is avoided. Therefore, the method has wide development potential.

The invention discloses a high-stability self-mode-locking optical fiber laser based on phase modulation. The high-stability self-mode-locking optical fiber laser is composed of an optical pumping source, a wavelength division multiplexer, an isolator, a coupler, a polarization beam splitter, a 45-degree Faraday rotating mirror, a 90-degree Faraday rotating mirror, a non-polarization-maintaining single-mode optical fiber, a polarization-maintaining single-mode optical fiber and an erbium-doped optical fiber. The wavelength division multiplexer, the isolator and the coupler can be integrated into a three-in-one device and can also be placed separately. The intra-cavity tail fiber and the output end are arranged to be polarization-maintaining single-mode optical fibers and are connected with a pumping source; polarization-maintaining single-mode optical fibers are arranged at the beam combining end and the beam splitting end of the polarization beam splitter; in the 45-degree Faraday rotating mirror, a tail fiber on one side is arranged to be a non-polarization-maintaining single-mode fiber, and a polarization-maintaining single-mode fiber is arranged on the other side. The saturable absorption effect is achieved through polarization state changes related to light intensity when a light field is transmitted in an optical fiber, but different from a traditional NPR, the whole structure does not need interference of a polarization controller, and the expected effect can be achieved only by controlling the input light intensity.

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.

An optically pumped on-chip solid-state laser includes a solid gain media substrate and a laser generating structure disposed above the solid gain media substrate. The laser generating structure includes a resonator, a pump light input structure, and a laser light output structure; and the resonator is disposed between the pump light input structure and the laser light output structure, and is propped against or is in clearance fit with the solid gain media substrate.

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 provides a picosecond pulse source based on a harmonic self-mode-locking semiconductor surface emitting laser, which comprises an optical pumping assembly and a V-cavity resonant cavity assembly, and is characterized in that the optical pumping assembly comprises a semiconductor bar laser and a collimating focusing lens optical coupling assembly, and the V-cavity resonant cavity assembly comprises a microcavity gain structure and an outer cavity structure; pump laser emitted by the semiconductor bar laser is focused and coupled through the collimating focusing lens optical coupling assembly, then light spots are output, the light spots are absorbed and gained through the microcavity gain structure, and resonance laser is output through feedback resonance of the outer cavity structure. And when the resonant laser in the external cavity structure is matched with the light spot, the external cavity structure outputs a mode-locked pulse after spatio-temporal dynamics calculation and adjustment. The picosecond pulse source realizes harmonic mode-locked pulse output with hundred picosecond pulse width and hundred MHz repetition frequency.

The invention belongs to the technical field of laser, and discloses a method and system for generating mid-infrared laser based on soliton self-frequency shift, and the method comprises the steps: obtaining a 2 [mu] m ultrashort pulse laser pumping source, a forward pumping source and a reverse pumping source; coupling the obtained 2-micron ultrashort pulse laser pumping source and the forward pumping source to a first end of a gain fiber, and coupling the obtained reverse pumping source to a second end of the gain fiber; adjusting the ratio of the pumping power of the forward pumping source in the first end of the gain optical fiber to the pumping power of the reverse pumping source in the second end of the gain optical fiber, and exciting the 2-micron ultra-short pulse laser pumping source in the gain optical fiber to generate soliton self-frequency shift to obtain wide-spectrum ultra-short pulse laser; and inputting the broad-spectrum ultrashort pulse laser into a filter for wavelength filtering treatment to obtain 2.8 [mu] m intermediate infrared laser. By adjusting the pumping power of the pumping sources at the two ends of the gain fiber, various different soliton self-frequency shift effects can be obtained.

The invention discloses a cylindrical vector optical fiber amplifier based on a rotary conical optical fiber. The cylindrical vector optical fiber amplifier comprises a cylindrical vector optical seed source; an isolator, a beam combiner, a rotary conical optical fiber and a cladding light pumping stripper are sequentially arranged in the column vector light transmission direction of the column vector light seed source, and a first pumping source is further welded to the input end of the beam combiner. The rotary conical optical fiber is adopted as the gain optical fiber, the stability of light polarization can be effectively kept in the cylindrical vector light amplification process, the sensitivity to temperature is reduced, and meanwhile the mode purity is improved.

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.

The invention discloses a high-order two-dimensional Hermitian-Gaussian mode laser, which comprises a pumping source, a pumping focus lens, a laser gain medium, a laser total reflective mirror, a concave folding mirror and a laser output mirror, and is characterized in that the pumping source emits pumping light in an absorption band of the laser gain medium; pump light is focused by the pump focus lens and enters the laser gain medium. The laser gain medium absorbs the pump light, population inversion is formed, and laser gain is generated; the laser total reflective mirror and the concave folding mirror have high reflectivity for laser wavelength, the laser output mirror has partial transmittance for laser wavelength, and the laser total reflective mirror, the concave folding mirror and the laser output mirror jointly form a folded laser resonant cavity to provide feedback for laser.

An optical switch device and a related method for defining a topological light transport channel in a photonic lattice are provided. An exemplary optical switch device includes a photonic lattice including a photonic topological microring array comprising a plurality of site rings coupled via a plurality of anti-resonant link rings, a plurality of input light ports and a plurality of output light ports located at the plurality of site rings, wherein the plurality of input light ports and the plurality of output light ports are respectively connected by a plurality of topological light transport channels. The optical switch device is further configured such that each of the topological light transport channels is defined by a gain domain area that is produced by a corresponding patterned optical pumping beam emitted onto the photonic topological microring array.

The utility model provides a micro-area femtosecond transient absorption detection system. A femtosecond laser light source control assembly is used for generating laser; the first spectroscope is used for dividing the femtosecond laser into two beams of light; the pump light adjusting assembly is used for generating pump light and adjusting intensity and frequency; the detection light adjusting assembly is used for generating detection light and adjusting the intensity of the detection light to be proper and stable; the beam combiner is used for combining the pump light and the detection light; the transmission absorption detection assembly is used for irradiating a sample with the pump light and the detection light and generating detection transmission light; the reflection absorption detection assembly is used for irradiating the pump light and the detection light to a sample and generating detection reflected light; the microscopic imaging assembly is used for carrying out microscopic observation on the sample area and determining a to-be-detected position, and determining that the pump light and the probe light are accurately irradiated on the to-be-detected position; the detection assembly is used for collecting detection light. According to the utility model, ultrahigh space and time resolution is realized, and functions of transmission transient absorption detection, reflection transient absorption detection and micro-area microscopic imaging are integrated.

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 invention relates to an ultra-short and ultra-strong pulse laser generation method and device, and belongs to the technical field of ultra-short pulse laser, and the ultra-short and ultra-strong pulse laser generation method comprises the steps: S100, dividing pulse laser output by a laser into two paths, and respectively taking the two paths as signal light and pump light; s200, performing optical parametric amplification and light splitting on the pump light and the signal light in a near-degenerate collinear mode to generate amplified signal light and idler frequency light; s300, the amplified signal light and idler frequency light are subjected to pulse compression and then spectrum beam combination, and ultra-short and ultra-strong pulse laser is output. The technical problem that in the prior art, the energy conversion efficiency in the optical parameter amplification process is low can be solved.

The invention discloses an optomagnetic modulation method and device for enhancing a single-beam free precession atom magnetometer signal, which is based on a synchronous optical pumping technology and a radio frequency magnetic field pulse control technology, controls the spin polarization of atoms through optomagnetic modulation and excites a free precession signal, so that more spin polarization components participate in free precession, and the free precession of the atoms is enhanced. And all-around signal enhancement of the single-beam free procession atom magnetometer is realized. The free precession signal is enhanced, the signal-to-noise ratio is improved, further improvement of the sensitivity of the single-beam free precession atom magnetometer is facilitated, and further application of the single-beam free precession atom magnetometer in the field of quantum precision magnetic field measurement in the future is facilitated.

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.