18 results about "Mid ir lasers" patented technology

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.

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.

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.

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.

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 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 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.

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 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.

This invention relates to a DC drive protection circuit and its design method for a mid-infrared laser, belonging to the field of power supply drive protection technology. The core of this invention lies in achieving dual hardware protection for both laser voltage and current through three main modules. Key technical points include: a voltage protection module composed of comparator U1, operational amplifier U3, etc., integrating a voltage differential, hysteresis comparator, and adjustable potentiometer to monitor the voltage difference across the laser in real time and automatically cut off the power supply in case of overvoltage; a current protection module composed of comparator U5, etc., which limits the amplitude of the microcontroller's D / A signal through a hysteresis comparator and potentiometer to precisely control the current range; and a voltage-controlled constant current source module composed of operational amplifier U6, etc., generating a constant current to drive the laser. The voltage protection allows for flexible switching of the power supply based on the actual voltage difference, avoiding frequent false triggering; the current protection threshold is adjustable via a potentiometer to adapt to different laser specifications; and the constant current source ensures stable output. This improves the reliability and lifespan of the mid-infrared laser.

The application provides a mid-infrared laser based on hydrogen Raman laser and optical parametric oscillation, comprising a Nd:YAG laser, a hydrogen stimulated Raman cell and an optical parametric oscillator, wherein the Nd:YAG laser emits circularly polarized laser, the circularly polarized laser enters the hydrogen stimulated Raman cell, and multi-wavelength laser is generated through a stimulated Raman process; and specific wavelength laser in the multi-wavelength laser excites the optical parametric oscillator to generate mid-infrared laser. In the application, 1064nm circularly polarized laser generates 2.1mu m laser through hydrogen stimulated Raman, and the 2.1mu m laser pumps ZGP OPO to generate 3-5mu m infrared laser. The working principle of the laser of the application is simple, and compared with the scheme of Tm:YLF, Ho:YAG and OPO emitting light in turn, the complexity is significantly reduced, and the advantages of the stable and reliable Nd:YAG laser are fully utilized.

The present disclosure relates to the technical field of laser optical detection, and provides a sub-micron foreign matter nondestructive detection device and a sub-micron foreign matter nondestructive detection method. The device comprises a moving carrier, a mid-infrared laser, a laser vibration detector and a signal processing module. The mid-infrared laser is used for emitting mid-infrared laser beams of different wavelengths to a sample to be detected. The signal processing module is electrically connected with the laser vibration detector and is used for receiving and processing the measurement signals of the laser vibration detector. After the detection laser irradiates the sample to be detected, the detection laser can be reflected, refracted or scattered back to the laser vibration detector. The photodetector is used for detecting the interference frequency difference of the combined laser beams and converting the interference frequency difference into an electrical signal of the vibration of the sample to be detected. The method can realize rapid detection of sub-micron foreign matters on the surface of the sample to be detected, and the sample to be detected is not damaged in the whole detection process, and the method can be applied to online detection of the sample to be detected in a pipeline.

The invention discloses an in-situ measurement system and method for temperature sensitivity in an optical frequency standard, and relates to the technical field of quantum precision measurement and optical frequency standards. Comprising a quantum trapping device, a radiation field modulation subsystem, an optical detection subsystem and a comprehensive control and demodulation unit which are arranged in a vacuum system, the radiation field modulation subsystem comprises an intermediate infrared laser, a light intensity modulator and a light path guiding system, and the optical detection subsystem comprises an ultra-stable clock laser, a fluorescence collection and detection module and a frequency measurement module. The method and the device are used for solving the technical problem of directly measuring the response sensitivity of the transition frequency to the temperature in situ at the atom / ion trapping position.

A miniature mid-infrared laser based on double microdisks, comprising a laser source (1), a coupler (2), an echo wall microdisk laser (3), and an echo wall microdisk optical parametric oscillator (4).