14 results about "Mid infrared laser" patented technology

The application provides a 2.8 mu m single-frequency fiber laser based on a pump-enhanced saturable absorber and belongs to the technical field of mid-infrared laser. The linear resonant cavity of the laser is composed of a low-refractivity fiber grating and a high-refractivity fiber grating, and a first pump coupler, an erbium-doped fluoride gain fiber, a pump light stripper and a pump-enhanced saturable absorber filter device are sequentially arranged in the cavity. The filter device contains enhanced pump light injected by a second pump source through a second pump coupler and used for exciting the absorption characteristics of the erbium-doped saturable absorption fiber; the laser of the first pump source is used for pumping the gain fiber to generate laser oscillation, and the enhanced pump light is used for forming a MHz-level ultra-narrow band dynamic grating in the saturable absorption fiber. The dynamic grating and the static filter of the fiber grating work cooperatively to realize stable single-longitudinal-mode selection, and finally the single-frequency laser is output from the first fiber end cap. The application realizes compact structure and high stability of 2.8 mu m single-frequency laser output.

A narrow linewidth mid infrared laser, including a pumping laser diode with a fast-axis compressor and a pumping wavelength λo; and an optical resonator arranged to receive the pumping wavelength λo, the optical resonator including a laser crystal with a lasing wavelength λp, a dichroic mirror, and a nonlinear crystal to generate an idler wavelength λi.

An atomic force microscope-based nanoscale photothermal ion in-situ characterization device, comprising: an atomic force microscope module comprising an AFM conductive probe in contact with a to-be-measured region of a to-be-measured sample; a nanometer infrared photothermal excitation module for emitting pulsed mid-infrared laser to the to-be-measured region to cause the micro-cantilever of the AFM conductive probe to deform; a photothermal ion signal detection module comprising a signal detection unit and a data processing and display unit in communication, the signal detection unit being used to acquire the micro-cantilever signal of the AFM conductive probe; wherein the data processing and display unit acquires the photothermal ion second-harmonic signal of the to-be-measured region based on the micro-cantilever signal of the AFM conductive probe to display the image of the ion transport micro-region surface distribution of the to-be-measured region.

This invention discloses a laser irradiation therapy device based on metal film directional scattering beam expansion, comprising a chassis, a power supply module, an intelligent control module, a mid-infrared laser emission module, and a human-computer interaction component mounted on the chassis. It also includes a laser transmission module, a metal film directional scattering beam expansion and homogenization module, a visible laser emission module, a temperature detection module, and an adjustable support. During operation, the mid-infrared laser is transmitted to the beam-combining module via a light guide arm or flexible mid-infrared hollow fiber, while the visible laser is transmitted to the beam-combining lens via a visible light incident channel. The two lasers form a coaxial composite beam at the beam-combining lens, which together irradiates the metal film component. After directional scattering and beam expansion, the beam is output from the light outlet to the working area, forming an expanded and homogenized light spot. This therapy device, with the metal film component as the core optical shaping component, has advantages such as clear structure, adjustable light output direction, adjustable light spot area, visualized working area, and high safety.

A method of closing an opening in a tissue comprises providing a light absorbing material, introducing the light absorbing material into a tissue opening, and irradiating the light absorbing material with at least one light source so as to increase a temperature of the light absorbing material, causing the tissue edges of the tissue opening adhere to the light absorbing material and / or to each other. A kit comprising a light absorbing material and a light emitting device is also described.

A mid-infrared laser generation system based on dispersion-managed soliton bunch pulses. The system can achieve high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of an all-fiber configuration, a compact structure and a high power proportion in a longer-wavelength region of a mid-infrared spectrum. A pulsed fiber laser device generates a nanosecond pulse laser in a 1.5-micron band. A fiber pulse stretcher is made of a single-mode silica fiber, splits nanosecond pulses into a plurality of ultrafast soliton pulses by means of a nonlinear effect, and performs spectral energy conversion from 1.5 microns to 2.4 microns. A fiber laser amplifier further increases the output power of a stretched pulse laser and extends a spectrum to a 2.7-micron band, and also increases pulse energy beyond a 2.3-micron band. A fiber mode field adapter efficiently couples into a nonlinear fiber pulses generated in the fiber laser amplifier. The nonlinear fiber extends a laser to a mid-infrared 3-5-micron band, thereby achieving high-power, high-efficiency and high-proportion mid-infrared laser output.

The application provides a mid-infrared laser linewidth measurement device and method based on a hollow-core anti-resonant fiber, and belongs to the technical field of precise laser parameter measurement. The device comprises a mid-infrared single-frequency laser, a first collimating lens, a beam splitter, an acousto-optic modulator, an aperture, a first mirror, a converging lens, a hollow-core anti-resonant fiber, a second collimating lens, a second mirror, a beam combiner, a photodetector and a spectrum analyzer. The method is as follows: after the laser is split, one path is frequency-shifted, and the other path is introduced into a time delay through the fiber; beat frequency signals are generated by interference of the two paths of light; and the linewidth is obtained through photoelectric conversion and spectrum analysis. The application takes a low-loss hollow-core anti-resonant fiber as a core delay element, solves the problem of difficulty in realizing long optical path delay in the mid-infrared waveband, has the advantages of compact structure, convenient adjustment, wide applicable waveband and high measurement precision, and is suitable for precise linewidth measurement of a 2-5 mu m single-frequency laser.

The application discloses a kind of copper electrode laser curing system and method of TOPCon solar cell, the system includes mid-infrared laser generation module, beam shaping and energy management module, precision motion and positioning platform and synchronous control and monitoring module.The method used is: after coating copper paste on the back silver seed layer of TOPCon battery, laser beam is irradiated, by accurately controlling laser energy density and pulse width, energy is selectively resonant absorbed by copper paste organic matter, millisecond level rapid curing is realized, while ensuring that energy density is lower than the damage threshold of lower layer aluminum oxide / silicon nitride passivation film, so that the base temperature rise is lower than 200 DEG C.The application overcomes the defects of traditional thermal curing, such as low efficiency, high energy consumption and easy damage to passivation layer, and provides an efficient, reliable and non-damage battery performance industrialization solution for TOPCon battery low-cost "de-silverization".

The application discloses a kind of based on multi-dimensional multiplexing common-cavity mode-locking mid-infrared double optical comb fiber lasers, it is related to mid-infrared laser technical field, the application is coupled into composite resonator by two fiber ring resonators, and the polarization multiplexing double optical comb of any fiber ring resonator output is simultaneously generated four near-infrared mode-locked optical comb, the wavelength of two ring direction mode-locked lasers is different, while the same ring direction wavelength is same, and the repetition frequency is different, and then nonlinear crystal makes two same polarization optical comb with same repetition frequency among them difference frequency, and then wavelength is converted into mid-infrared, and finally the mid-infrared double optical comb laser with different repetition frequency is obtained, four optical comb in this process share the same fiber ring resonator when direction multiplexing and polarization multiplexing control, so that the relative timing jitter between four optical comb is effectively inhibited, share bidirectional coupler and nonlinear crystal when mid-infrared laser is generated in difference frequency, so that the difference frequency output of single-cavity multi-optical comb is realized.

The application discloses an improved preparation method of a hollow laser fiber for middle infrared laser. The fiber comprises a silica glass tube and a polymer layer, a single Ag layer and an AgI layer arranged on the inner surface of the glass tube in sequence. The preparation method comprises the following steps: firstly, coating a PMMA or PVA polymer layer on the inner wall of the glass tube; secondly, injecting a silver ammine complex and a dextrose reducing agent solution into the tube at the same time, and rotating the glass tube at a speed of 0.1-2 revolutions per minute during the injection process, so as to form a uniform and dense single Ag layer on the polymer layer in situ through a silver mirror reaction; and finally, injecting an iodine / cyclohexane solution to form an AgI layer on the surface of the Ag layer. Through the introduction of the polymer layer and the dynamic rotation silver plating process, the adhesion, uniformity and density of the plating layer are significantly enhanced. The obtained fiber shows extremely low transmission loss and high power resistance (can withstand 30W power continuous transmission) when transmitting 9300-10600nm wavelength laser, and is particularly suitable for medical laser equipment for cutting hard connective tissue.

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.

This invention discloses a mid-infrared narrow-linewidth fiber laser based on microsphere feedback and a method for laser output, relating to the field of mid-infrared laser technology. The mid-infrared narrow-linewidth fiber laser includes Er... 3+ / Yb 3+ Co-doped low-hydroxyl fluorotellurate glass optical fiber, pump light source, multilayer dielectric film and passive fluorotellurate glass microspheres, Er 3+ / Yb 3+ The co-doped low-hydroxyl fluorotellurate glass fiber has a tapered region, and passive fluorotellurate glass microspheres achieve wavelength-selective feedback of the whispering-gallery mode through evanescent field coupling. This invention can output a narrow linewidth laser of 2.7 μm, which is extended to the 3-5 μm band through stimulated Raman scattering. This invention has advantages such as narrow linewidth, high stability, precise coupling, and good integration, and is suitable for applications such as environmental monitoring, biomedicine, and high-precision spectroscopic detection.

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.

This invention relates to a mid-infrared femtosecond laser hair regrowth device and treatment instrument. The mid-infrared femtosecond laser hair regrowth device includes a regenerative amplification module for generating near-infrared femtosecond laser; a parametric conversion module for receiving the near-infrared femtosecond laser, converting it into mid-infrared laser, and outputting it; an anti-resonant hollow fiber, the input end of which is coupled to receive the mid-infrared femtosecond laser output by the parametric conversion module for transmitting the mid-infrared laser; and a treatment handpiece including a first collimating lens, a scanning galvanometer, and a liquid lens. The first collimating lens is located on the output optical path of the anti-resonant hollow fiber for collimating the mid-infrared laser, the scanning galvanometer is used to control the deflection of the collimated beam, and the liquid lens is used to receive the deflected beam and adjust its focusing state. The mid-infrared femtosecond laser hair regrowth device and treatment instrument can output mid-infrared femtosecond laser with precise wavelength, achieve low-loss flexible laser transmission, and can be adjusted in real time on the working surface.