37 results about "Mid ir lasers" patented technology

The invention relates to the technical field of TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas monitoring, in particular to a methane and ethane dual-gas detection method based on an intermediate infrared laser. A DAC pin of a single-chip microcomputer is adopted to output sawtooth scanning signals modulated by superposition sine waves, by adjusting the amplitude of the sawtooth scanning signals, the wavelength of light emitted by a laser is controlled to be 3344.4 nm and 3345.8 nm, meanwhile, the positions of absorption peaks of ethane and methane are covered, simultaneous detection of methane and methane is achieved, and the detection precision is high. The methane scanning signal and the ethane scanning signal can be independently modulated by changing the amplitude of sine waves of different wave bands of the sawtooth scanning signal, so that the signal-to-noise ratio of single gas detection is increased, the sensitivity is higher, and the ppb level can be easily reached. According to the method, the single chip microcomputer is adopted to output scanning signals, sine waves with different modulation amplitudes can be output in a quick response mode, use is more flexible, cost reduction is facilitated, and the detection precision of single gas is greatly improved by independently modulating different gas scanning signals.

The invention provides an infrared spectral signal acquisition system and method.The system comprises a light path system, a main control computer, an intermediate infrared laser, a laser vibration meter and a sample displacement table, the intermediate infrared laser, the laser vibration meter and the sample displacement table are electrically connected with the main control computer, and the intermediate infrared laser is used for emitting intermediate infrared pulse laser which irradiates the surface of a to-be-measured sample through an intermediate infrared light path; a photo-thermal vibration signal is generated; the laser vibration meter is used for emitting vibration measurement laser, irradiating the vibration measurement laser to the surface of the to-be-measured sample through a vibration measurement light path and receiving a returned vibration signal; and the main control computer is used for adjusting laser signal parameters of the intermediate infrared laser and the laser vibration meter, controlling the sample displacement table to move and performing signal analysis processing on vibration signals acquired by the laser vibration meter. According to the invention, the laser vibration meter can detect the infrared spectrum signal, and the detection sensitivity of the sample surface signal is improved.

The application provides a high-sensitivity multi-gas real-time monitoring device and method, which comprises a controller, wherein the controller is connected with a main control circuit; the main control circuit is connected with an indicating laser and a mid-infrared laser array; the indicating laser and the mid-infrared laser array are connected with a multi-pass gas cell through a fiber coupling structure; a photoelectric detector is arranged on the light outlet side of the multi-pass gas cell; and the photoelectric detector is connected with the main control circuit; the controller generates modulation signals with different frequencies to modulate the mid-infrared laser array; the indicating laser emitted by the indicating laser and the mid-infrared laser emitted by the mid-infrared laser array are coupled into a coaxial light beam through the fiber coupling structure and enter the multi-pass gas cell; the photoelectric detector collects signals with target gas information passing through the multi-pass gas cell and simultaneously analyzes the concentrations of multiple target gases through a signal conditioning algorithm. The application has the characteristics of high sensitivity, low detection limit, real-time monitoring, convenient installation, strong anti-interference ability, maintenance-free and wide application range.

The invention discloses a mid-infrared laser based on three-device on-chip integration and a preparation method thereof, relates to the crossing field of a semiconductor laser technology and an optical communication technology, and solves the problem that the existing quantum cascade laser QCL technology cannot give consideration to both high modulation rate and high power. An intermediate infrared laser comprises a QCL unit, an EAM unit and an SOA unit which are sequentially arranged on a substrate. The substrate comprises a semi-insulating InP (Indium Phosphate); the QCL unit, the EAM unit and the SOA unit share the same ridge-shaped waveguide structure and grow through epitaxy butt joint. The method provided by the invention is suitable for a mid-infrared band space communication scene with high requirements on the laser modulation rate, the output power and the single-mode stability.

The invention provides a temperature control method of an intermediate infrared laser, and relates to the technical field of lasers. The temperature control method comprises the steps that the reference temperature T0 of the intermediate infrared laser is set, and driving current is injected into the intermediate infrared laser; in any nth period of the driving current, initial temperature parameters of the intermediate infrared laser are collected, and an initial temperature control curve T (n) of the nth period is formed; forming a reference temperature curve T1 (n) in the nth period based on the initial temperature control curve T (n); forming a gradient temperature control curve of the nth period based on the initial temperature control curve T (n), the reference temperature curve T1 (n) and the reference temperature T0; and forming temperature control data based on the gradient temperature control curve, and storing the temperature control data in the temperature control device, so that the temperature control device performs temperature control on the intermediate infrared laser according to the temperature control data. The invention further provides electronic equipment and a temperature control device.

A vibrationally enhanced fluorescence microscopy system includes a narrowband pulsed mid-infrared laser configured to excite selected chemical bond vibrations in a sample. A continuous-wave visible laser is coaligned with the mid-infrared laser and configured to induce fluorescence from at least one fluorescent reporter bound to the sample. An external pulse generator temporally synchronizes emission of the mid-infrared pulses with emission of the visible laser. A reflective objective is arranged to deliver the mid-infrared pulses to a focal plane within the sample. A water-immersion objective is coaxially aligned with the reflective objective and arranged to collect the fluorescence from the focal plane. A photon-counting detector is coupled to receive the collected fluorescence. Control electronics are configured to output a vibrational-contrast signal derived from counts produced by the photon-counting detector.

The present application relates to the technical field of optical fibers, in particular to a dual-wavelength femtosecond fiber laser. The laser comprises a pumping light source, which is used for outputting first-wavelength femtosecond pulse laser and a first excitation light source; a double-clad nonlinear optical fiber, which is connected to an output end of the pumping light source and is used for converting part of the first-wavelength femtosecond pulse laser into second-wavelength femtosecond pulse laser by means of using the soliton self-frequency shift effect, and outputting the remaining first-wavelength femtosecond pulse laser, the second-wavelength femtosecond pulse laser and the first excitation light source; and a holmium-doped gain fiber, which is connected to the output end of the double-clad nonlinear optical fiber and is used for amplifying the first-wavelength femtosecond pulse laser and the second-wavelength femtosecond pulse laser under the excitation of the first excitation light source. Therefore, the present application achieves the output of dual-wavelength high-energy femtosecond pulse laser in full-fiber mid-infrared lasers, achieves a compact and portable structure, good environmental adaptability and wavelength and energy advantages in practical applications such as medicine and material processing, and is applicable to vehicle-mounted scenarios, airborne scenarios, etc.

This application provides a cavity-enhanced mid-infrared photothermal vibration measurement system and method, relating to the field of photothermal vibration spectrum detection of materials, aiming to improve the accuracy and sensitivity of detection. The measurement system includes a cavity-enhanced substrate, a mid-infrared laser, a laser vibrometer, and a lock-in amplifier. The cavity-enhanced substrate includes a substrate and an asymmetric Fabry-Perot resonator. The asymmetric Fabry-Perot resonator includes a reflective layer, an intermediate dielectric layer, and a layer to be tested, sequentially stacked on the substrate. The mid-infrared laser applies mid-infrared laser light to the layer to be tested, causing the layer to generate a photothermal vibration signal. The laser vibrometer detects the photothermal vibration signal and converts it into a detection electrical signal. The lock-in amplifier extracts the detection electrical signal to determine the photothermal vibration spectrum of the layer to be tested. The ratio of the thickness of the intermediate dielectric layer to the thickness of the layer to be tested ranges from 0.8 to 10. The refractive index of the material of the layer to be tested is less than the refractive index of the material of the intermediate dielectric layer, but greater than the refractive index of air.

The application discloses a kind of base frequency gain and nonlinear frequency conversion integrated monocrystal optical fiber and its preparation method and application, belong to laser technical field.The monocrystal optical fiber covers base frequency gain monocrystal optical fiber and one or more nonlinear monocrystal optical fiber, and is made by the way of first bulk crystal bonding and then integrated drawing, and can be applied to micro visible light, ultraviolet or mid-infrared laser.The application can significantly reduce the influence of spatial walk-off effect in bulk crystal nonlinear process, improve energy conversion efficiency, show the advantages of miniaturization, high efficiency and stable performance, completely break the limitation of traditional laser in conversion efficiency and volume, with good practicability, higher universality and excellent market application prospect.

The invention provides a high-power all-fiber intermediate infrared laser, which relates to the technical field of fiber laser, and comprises a Raman fiber laser pumping source, a fiber laser system, a fiber coupling type pumping power stripper, a fiber coupling type isolator and an all-fiber laser amplification system. According to the Raman fiber laser pumping source, 1.5-micron laser is subjected to Raman effect frequency shift to generate 1.7-micron pump light, the fiber laser system absorbs the 1.7-micron pump light to generate 2.8-micron laser, and the 2.8-micron laser is injected into the laser amplification stage system through the pumping power stripper and the isolator to be amplified to generate high-power laser. According to the laser provided by the embodiment of the invention, quantum efficiency can be remarkably improved and system heating can be reduced by using 1.7 mu m pumping, different systems are connected through optical fiber coupling devices to form an all-optical-fiber system, high-power, high-efficiency and stable laser output is realized, and meanwhile, the influence of environmental factors on system performance can also be avoided.

This invention discloses a holmium ion-doped yttrium gadolinium oxide single-crystal optical fiber, its preparation method, and its applications, belonging to the field of laser materials and laser technology. The chemical formula of the single-crystal optical fiber is Ho. 3+ YGdO3, wherein the Ho ion doping concentration is 0.2-1.0 at.%, is a cubic C-type sesquioxide crystal structure with space group Ia-3. This crystal exhibits characteristic absorption peaks at wavelengths of 1100-1200 nm and Ho-derived absorption peaks at 2.80-2.90 μm. 3+ ion 5 I6→ 5 Broad-spectrum mid-infrared fluorescence emission with I7 level transition; this crystal possesses a wide gain bandwidth, a large emission cross section, and excellent thermal properties, making it less prone to thermal lensing and thermal depolarization under continuous or high-repetition-rate pumping of single-crystal fibers, thus ensuring high stability of laser output. It is particularly suitable for realizing broadband tunable and ultrafast mode-locked mid-infrared lasers, and has broad application prospects in laser surgery, environmental monitoring, remote sensing, and other fields.

The invention provides an intermediate infrared laser, and relates to the technical field of laser. The mid-infrared laser comprises a first pumping source, a second pumping source, a first crystal, a second crystal, an optical rotator, a first quarter-wave plate, a first high-reflection mirror, a polarization splitting prism, an electro-optical switch, a first saturated absorption lens, a second high-reflection mirror and a third high-reflection mirror. The first crystal and the second crystal are excited by initial light beams emitted by the first pumping source and the second pumping source to generate a first light beam and a second light beam; the optical rotator couples the first light beam and the second light beam to generate an initial state light beam; the first quarter-wave plate changes the phase of the light beam in the initial state and cooperates with the first high-reflection mirror to generate a first linearly polarized light beam; the polarization splitting prism reflects the first linearly polarized light beam, so that the first linearly polarized light beam continuously oscillates in the resonant cavity. After the electro-optical switch is started, the first linearly polarized light beam is converted into a second linearly polarized light beam which is output by the polarization splitting prism, and laser is output efficiently.

The invention discloses a mid-infrared laser with tunable broadband wavelength, which comprises an electric control optical parametric oscillator, a nonlinear gain part of the electric control optical parametric oscillator is periodically poled lithium niobate, a laser incident surface and a laser emergent surface of the periodically poled lithium niobate are plated with endoscope films to form a resonant cavity, and the resonant cavity is formed by applying voltage to the periodically poled lithium niobate. By changing the polarization state of the light, the wavelength tuning range of the mid-infrared laser can be 2.5-4.0 [mu] m.

The invention relates to the technical field of laser optical detection, and provides a micro-nano coating nondestructive testing device and a micro-nano coating nondestructive testing method.The device comprises a displacement carrying table, an intermediate infrared laser, a laser vibration meter, a signal processing module and a displacement carrying table controller; the displacement platform deck can move the device to be tested along a plurality of different directions; the mid-infrared laser is used for emitting mid-infrared laser with different wavelengths to the to-be-tested device; the laser vibration meter is used for emitting vibration detection laser to the micro-nano coating on the surface of the to-be-detected device and processing the received vibration detection laser to obtain vibration information of the surface of the to-be-detected device; the signal processing module is used for processing and converting the vibration information into a vibration electric signal; the displacement platform deck controller can apply compensation vibration to the displacement platform deck according to the vibration electric signal so as to offset initial vibration of the to-be-tested device in the displacement platform deck. According to the method, the micro-nano-scale rapid detection of the surface coating of the to-be-detected device can be realized, and the whole detection process does not cause any damage to the to-be-detected device.

A mid-infrared laser based on on-chip integration of three devices and its fabrication method is disclosed, involving the intersection of semiconductor laser technology and optical communication technology. This invention alleviates the problem of the existing quantum cascaded laser (QCL) technology being unable to simultaneously achieve high modulation rate and high power. The mid-infrared laser includes a QCL unit, an EAM unit, and an SOA unit sequentially disposed on a substrate; the substrate comprises semi-insulating InP; the QCL unit, EAM unit, and SOA unit share the same ridge waveguide structure and are grown through epitaxial docking. The method described in this invention is applicable to mid-infrared band space communication scenarios with high requirements for laser modulation rate, output power, and single-mode stability.

Disclosed are systems and methods utilizing an infrared probe and discriminating software to rapidly discriminate abnormal tissue processes from normal tissue during surgery, physical examination of in-situ lesions, and in the assessment of biopsy and resected tissue specimens. Examples demonstrate discrimination of cancerous from noncancerous tissues. The discriminating software, i.e. the metrics, algorithms, calibrant spectra, and decision equations, allows tissue to be identified as abnormal or normal using a minimum of infrared (IR) wavelengths in order to be measured rapidly. The probe records IR metrics approximately 1000 times faster than current commercial instruments, i.e. on a timescale fast enough for clinical use. The probe uses a tunable mid-infrared laser with a small set of selected wavelengths that are optimized for detecting the chemical and molecular signatures of tissue specific lesions to include, but not limited to, cancer, preneoplasia, intracellular accumulations (e.g. steatosis), inflammation, and wound healing.

The invention provides an optical cavity enhanced mid-infrared light thermal vibration measurement system and method, relates to the field of material photo-thermal vibration spectrum detection, and aims to improve the accuracy and sensitivity of detection. The measurement system comprises an optical cavity enhanced substrate, an intermediate infrared laser, a laser vibration meter and a lock-in amplifier. The optical cavity enhancement base comprises a substrate and an asymmetric Fabry-Perot resonant cavity, and the asymmetric Fabry-Perot resonant cavity comprises a reflecting layer, an intermediate dielectric layer and a to-be-detected object layer which are sequentially stacked on the substrate. The mid-infrared laser acts mid-infrared laser on the to-be-detected object layer, so that the to-be-detected object layer generates a photo-thermal vibration signal. The laser vibration meter detects a photo-thermal vibration signal and converts the photo-thermal vibration signal into a detection electric signal. And the lock-in amplifier extracts the detection electric signal to determine the photo-thermal vibration spectrum of the to-be-detected object layer. And the ratio of the thickness of the intermediate dielectric layer to the thickness of the to-be-detected object layer is 0.8-10. The refractive index of the material of the to-be-detected object layer is smaller than the refractive index of the material of the intermediate dielectric layer and larger than the refractive index of air.

The invention relates to the technical field of laser optical detection, and provides a submicron foreign matter nondestructive testing device and a submicron foreign matter nondestructive testing method.The submicron foreign matter nondestructive testing device comprises a movable carrying table, an intermediate infrared laser, a laser vibration meter and a signal processing module; the mid-infrared laser is used for emitting mid-infrared laser with different wavelengths to the to-be-tested sample piece; the signal processing module is electrically connected with the laser vibration meter and is used for receiving and processing a measurement signal of the laser vibration meter; the detection laser can be reflected, refracted or scattered back to the laser vibration meter after irradiating the to-be-detected sample piece; the photoelectric detector is used for detecting the interference frequency difference of the combined laser and converting the interference frequency difference into an electric signal of vibration of the to-be-detected sample piece. The method can rapidly detect the foreign matters on the surface of the to-be-detected sample in the submicron order, does not cause any damage to the to-be-detected sample in the whole detection process, and can be suitable for the assembly line on-line detection operation of the to-be-detected sample.

The utility model discloses a precision adjusting structure of an intermediate infrared laser, which relates to the technical field of lasers and comprises a laser main body used for generating intermediate infrared laser; the cavity mirror assembly comprises a total reflection mirror arranged at one end of the laser device main body and an output reflection mirror arranged at the other end of the laser device main body, and a resonant cavity is formed between the total reflection mirror and the output reflection mirror so that the mid-infrared laser can be stably output; the adjusting assembly comprises a first adjusting part and a second adjusting part, the first adjusting part is connected with the output reflecting mirror to drive the output reflecting mirror to rotate, and the second adjusting part is connected with the total reflection mirror to drive the total reflection mirror to rotate; and the linkage assembly is arranged between the first adjusting part and the second adjusting part, so that the first adjusting part and the second adjusting part rotate synchronously. According to the technical scheme provided by the utility model, the problem that the existing intermediate infrared laser cannot meet the use requirements of different scenes is solved.

The invention discloses an intermediate infrared laser optical fiber coupling method and system based on visible light reverse guidance. The system comprises an intermediate infrared laser, a light beam guiding module, a light beam collimation evaluation module and a reflection type collimator which are sequentially arranged in the direction of a main light path. Wherein the reflective collimator is connected with a visible laser source through a target optical fiber, and the visible laser source is detachably connected to the far end of the target optical fiber; the intermediate infrared laser and the light beam guiding module form an initial reference light path, and the visible laser source, the reflective collimator, the light beam collimation evaluation module and the light beam guiding module form a space reference light path; carrying out light path coupling on the initial reference light path and the space reference light path until the light beam of the intermediate infrared laser is completely overlapped with the initial reference light path and the space reference light path; according to the invention, a coupling mechanism of firstly establishing an absolute reference and then completing relative restoration is formed, and rapid, accurate and visual alignment and coupling of intermediate infrared laser are realized.

The present invention provides a multi-wavelength mid-infrared sequence pulse laser, which includes a pump laser module, a laser Q-switching module, a beam control module and a mid-infrared laser module arranged along an optical path; wherein the pump laser module is used to generate continuous pump light; the laser Q-switching module is used to adjust the intracavity loss of the pump laser module so that the continuous pump light forms a sequence pulse laser, and the sequence pulse laser is also used as the pump light of the mid-infrared laser module; the beam control module is used to perform beam shaping on the formed sequence pulse laser; the mid-infrared laser module is used to absorb the sequence pulse laser and form a multi-wavelength mid-infrared laser with periodic output. As a new type of solid-state laser, the laser has multi-wavelength high-frequency sequential output compared to the existing mid-infrared laser, and each output wavelength has the characteristics of high repetition frequency and high peak power, which is of great significance in expanding the practicality and application scope of mid-infrared lasers.

A synchronous measurement system for a velocity and a temperature of an engine plume flow field is provided. The system includes multiple mid infrared lasers, a signal generator, two optical fiber amplifiers, two groups of optical fiber couplers, a photoelectric detector, a data acquisition device, and a host. The four mid infrared lasers are divided into two groups, one group is configured to emit two beams of first mid infrared lasers, and the other group to emit two beams of second mid infrared lasers. Each group of optical fiber couplers is arranged at an outlet of an engine through a mounting frame which are perpendicular to each other. The data acquisition device acquires photoelectric signals and processes them into corresponding spectral data. The host processes the spectral data to obtain the velocity and the temperature of the engine plume flow field.

The invention relates to the technical field of blood glucose detection and analysis, in particular to a photoacoustic blood glucose detection system and method based on dual-band laser switching. The system comprises: a laser excitation module, wherein the laser excitation module comprises an intermediate infrared laser and a near infrared laser; the ultrasonic signal acquisition module is used for receiving a photoacoustic signal generated by the subcutaneous tissue under the laser pulse emitted by the laser excitation module; the signal processing module is used for determining signal intensity corresponding to a glucose characteristic absorption peak according to the photoacoustic signals with the photoacoustic signal difference; and the blood glucose concentration calculation module is used for comparing the signal intensity with a preset calibration database and outputting the target human body blood glucose concentration value. The accuracy of blood glucose detection can be improved, and the contradiction among precision, wearing performance and clinical adaptability of a traditional scheme is solved.

The application provides a wavelength-tunable mid-infrared laser, comprising, in sequence along an optical transmission direction: a full-solid-state multi-wavelength laser for outputting short-wave infrared pulse lasers of multiple different wavelengths; a standard component assembly with a rotation angle for selectively outputting the short-wave infrared pulse lasers; a coupling module for beam shaping of the short-wave infrared pulse lasers; a first acousto-optic deflection assembly for changing the transmission direction of the short-wave infrared pulse lasers and injecting the short-wave infrared pulse lasers into an optical parametric oscillator; the optical parametric oscillator for absorbing the short-wave infrared pulse lasers and outputting mid-infrared pulse lasers of multiple different wavelengths; and a second acousto-optic deflection assembly for synchronously deflecting the mid-infrared pulse lasers to realize the common-aperture coaxial output of the mid-infrared pulse lasers. The mid-infrared laser output by the mid-infrared laser has the advantages of wide spectral coverage, fast wavelength switching, high repetition frequency, wavelength coding and common-aperture coaxial output.

The application discloses an automatic tooth cutting device based on ultrafast laser cutting, which comprises a laser system, a cooling system, a cutting arm, a control system and an imaging system; the laser system comprises a 1-micron ultrafast laser for generating 1-micron ultrafast laser and a 9.3-micron mid-infrared laser for generating 9.3-micron ultrafast laser; the cooling system is used for cooling during tooth cutting; the cutting arm is used for outputting laser to realize tooth cutting; the control system is used for controlling laser output, water flow speed in the cooling system and cutting of the cutting arm; the imaging system is used for real-time imaging of point positions in the oral cavity and feedback to the control system; the application adopts ultrafast laser as a tooth cutting tool, replaces a traditional cutting tool, has high tooth cutting precision and can accurately cut according to a pre-set shape.

The present disclosure relates to the field of laser optical detection technology, and provides a micro-nano coating non-destructive detection device and micro-nano coating non-destructive detection method. The device includes a displacement stage, a mid-infrared laser, a laser vibrometer, a signal processing module, and a displacement stage controller; the displacement stage can move the device to be tested in multiple different directions; the mid-infrared laser is used to emit mid-infrared lasers of different wavelengths to the device to be tested; the laser vibrometer is used to emit a vibration detection laser to the micro-nano coating on the surface of the device to be tested, and processes the received vibration detection laser to obtain vibration information on the surface of the device to be tested; the signal processing module is used to process the vibration information and convert it into a vibration electrical signal; the displacement stage controller can apply a compensating vibration to the displacement stage according to the vibration electrical signal to offset the initial vibration of the device to be tested in the displacement stage. This method can achieve rapid micro-nano-level detection of the surface coating of the device to be tested, and the entire detection process does not cause any damage to the device to be tested.

A multimodal therapy delivery system configured to deliver both biochemical material and energy therapies, the multimodal therapy delivery system includes at least one mid-infrared (MIR) laser, at least one MIR transparent fluoride fiber coupled to each of the at least one MIR laser, and a needle assembly with the at least one MIR transparent fluoride fiber threaded therethrough. The multimodal therapy delivery system is configured to deliver biochemical material through the needle assembly and wherein the multimodal therapy delivery system is further configured to deliver energy from the at least one MIR laser through the at least one MIR transparent fluoride fiber threaded through the needle assembly.

The invention discloses a greenhouse gas monitoring device under intermediate infrared wavelength. The detection unit comprises an absorption cell, the absorption cell comprises a light inlet for allowing incident light to pass through, a light outlet for allowing emergent light to pass through, a first reflecting mirror and a second reflecting mirror, and the vertical distance between the first reflecting mirror and the second reflecting mirror is adjustable; the calibration light path comprises a helium-neon laser, a first adjusting assembly and a beam splitter, and infrared light emitted by the helium-neon laser is adjusted by the first adjusting assembly and then enters the light inlet through a reflection point on the beam splitter; the detection light path comprises a mid-infrared laser and a second adjusting assembly. Detection light emitted by the mid-infrared laser is adjusted by the second adjusting assembly and then is transmitted to the light inlet through a reflection point on the beam splitter. According to the greenhouse gas monitoring device under the mid-infrared wavelength, the length of an optical path in the absorption cell is changed, the measurement precision of the absorption cell on gases in various concentration ranges is improved, and the accurate monitoring task for carbon emission of a park is effectively met.

The invention discloses an intermediate infrared laser based on a praseodymium-doped indium fluoride optical fiber, which is characterized in that a 2-micron wavelength pump is used for pumping Pr < 3 + > ions, and 4-5 microns laser is generated through cascade connection of two transition processes of < 3 > H6 to < 3 > H5 and < 3 > H5 to < 3 > H4 of the Pr < 3 + > ions. Comprising a pump laser; one end of the isolator is connected with the pump laser; the first optical fiber patch cord plug and the second optical fiber patch cord plug are in butt joint, and one end of the first optical fiber patch cord plug is further connected with the isolator; the signal light high-reflectivity fiber bragg grating is connected with one end of the second optical fiber patch cord plug; the praseodymium-doped indium fluoride optical fiber is connected with the signal light high-reflectivity optical fiber Bragg grating; the signal light low-reflectivity fiber bragg grating is connected with the praseodymium-doped fiber; and the pump light high-reflectivity grating is connected with the signal light low-reflectivity grating. According to the technical scheme provided by the invention, the mid-infrared laser with the wavelength of 4-5 microns can be generated. In addition, the device is high in integration level, an all-fiber structure can be achieved, and practical application is facilitated.

The application provides a dual-wave infrared laser synchronous calibration and coupling system and method, which comprises a first mid-infrared laser, a second mid-infrared laser, a semi-transparent half-mirror, a first mirror, a second mirror, a third mirror, a fourth mirror, a first diaphragm group, a second diaphragm group, a third diaphragm group, a first reflective collimator, a second reflective collimator, a first visible laser source, a second visible laser source, a first mid-infrared optical fiber, a second mid-infrared optical fiber, a first output end collimator, a second output end collimator, a standard device, a first detector and a second detector. The application innovatively converts the alignment problem of invisible light into the accurate adjustment of visible light, solves the technical problem of synchronous calibration and efficient coupling of the dual-laser system, has the characteristics of simple operation, high precision and low cost, and is particularly suitable for the synchronous measurement of multiple parameters of combustion fields, catalytic reaction flows and other thermal chemical reaction processes.