30 results about "Ultrashort laser" patented technology

Transcorneal and fiberoptic laser delivery systems and methods for the treatment of eye diseases wherein energy is delivered by wavelengths transparent to the cornea to effect target tissues in the eye for the control of intraocular pressure in diseases such as glaucoma by delivery systems both external to and within ocular tissues. External delivery may be affected under gonioscopic control. Internal delivery may be controlled endoscopically or fiberoptically, both systems utilizing femtosecond laser energy to excise ocular tissue. The femtosecond light energy is delivered to the target tissues to be treated to effect precisely controlled photodisruption to enable portals for the outflow of aqueous fluid in the case of glaucoma in a manner which minimizes target tissue healing responses, inflammation and scarring.

A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 micrometers (μm); providing cylindrical focusing optics; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intensive to cause permanent (Type II) change in the index of refraction within multiple Bragg grating planes in the core of the optical waveguide resulting from at least one micropore.

Optical energy for example, ultra-short laser beam pulses are delivered to a substrate by applying a temporal group 17 of optical pulses 16 to a region of the substrate 24. The temporal group 17 which

There is provided an ultrafast laser source and a method for fabrication thereof, the system comprising a waveguide module and a compression module, wherein the waveguide module generates pulses of multidimensional solitary states from ultra-short-laser pulses and the compression module compresses the pulses of multidimensional solitary states at the output of the waveguide module, the method comprising generating pulses of multidimensional solitary states from ultrashort laser pulses; and compressing the pulses of multidimensional solitary states.

The invention relates to a device (10) for generating ultrashort laser pulses with features of claim 1 and a method for generating ultrashort laser pulses with features of the dependent claim.

The invention discloses a structural material centrosymmetric double-embossment beam combining grating for the central wavelength of 1064 nanometers. The beam combining grating comprises a quartz substrate, a high-reflective film system, a matching layer, two non-centrosymmetric embossments, a lower embossment, an upper embossment and a filling layer between the two embossments which are sequentially plated from bottom to top. The filling layer can be filled by plating Ta2O5, or is filled by air. Under the action of different fillers, the following effects can be realized: under the filling of Ta2O5, under TE polarization, in the bandwidth of 1051-1070.3 nm, the incident-grade 1 diffraction efficiency is greater than 99% at 38.49 degrees, and the highest diffraction efficiency can reach 99.9%; under air filling, under TE polarization, within the bandwidth of 1030-1094.5 nanometers, 38.49-degree incidence-1-level diffraction efficiency is larger than 99%, the highest diffraction efficiency can reach 99.9%, the material has important application value in the fields of high-energy spectrum beam combining laser and ultra-strong and ultra-short laser pulse compression, meanwhile, the material has extremely high structural freedom degree, and the material is suitable for being used in the field of high-energy spectrum beam combining laser and ultra-strong and ultra-short laser pulse compression. And various application scenes in beam combination can be adapted by regulating and controlling the structure.

The invention relates to a pulse measurement method based on two-photon absorption, and the method comprises the following steps: S1, selecting perovskite as a medium, and placing the medium on a sample stage of a Michelson interferometer; s2, the light source emits an ultrashort laser pulse to be measured and divides the ultrashort laser pulse into two paths of pulses, one path of pulse passes through the adjustable delay line and then is combined with the other path of pulse in perovskite, and a two-photon absorption signal is generated; and S3, obtaining a two-photon absorption interference autocorrelation curve IAC experiment through the two paths of pulses and the two-photon absorption signal, and reconstructing to obtain complete information of the to-be-measured ultrashort laser pulse by combining the spectral intensity of the to-be-measured ultrashort laser pulse. According to the invention, multi-photon absorption response is taken as a core detection mechanism, so that the technical limitation of traditional non-linear effects depending on second harmonic generation and the like is effectively broken through, the problem that materials such as perovskite and the like do not have second harmonic so that pulse measurement cannot be realized is solved, and measurement of higher sensitivity and wider wave band of ultrafast light pulses is realized.

The invention relates to a method of amplifying an ultrashort laser pulse, the method comprising the steps of: a) temporally stretching an ultrashort laser pulse and obtaining a temporally stretched laser pulse; b) amplifying the temporally stretched laser pulse and obtaining an amplified temporally stretched laser pulse; c) compressing the amplified temporally stretched laser pulse and obtaining an amplified ultrashort laser pulse, wherein at least one amplification phase contribution is compensated for, the at least one amplification phase contribution being selected from the group consisting of a dynamic amplification phase contribution of the laser pulse, a bandwidth amplification phase contribution of the laser pulse, and a combination of the dynamic amplification phase contribution and the bandwidth amplification phase contribution, the dynamic amplification phase contribution resulting from nonlinear phase changes due to dynamic amplification in step b), the bandwidth amplification phase contribution resulting from nonlinear phase changes due to bandwidth amplification in step b), d) imparting an additional phase contribution to the laser pulse prior to step c), and / or wherein e) the spectrum of the laser pulse is changed such that the at least one amplification phase contribution is compensated for after step c).

The application discloses an ultrafast imaging device and method, which comprises, along an optical path, an ultra-short pulse laser, a time-domain shaping mechanism for separating the ultra-short laser pulse into light of different wavelengths and separating the light of different wavelengths in time, a space-domain shaping mechanism for separating the light of different wavelengths after time separation into multiple regions and converting the light into multiple parallel light beams to irradiate the sample at different incident angles, an objective lens for multiple frame imaging of the sample after irradiating the sample, a second convex lens array for mapping each frame of image to different positions of a high-speed camera, and a high-speed camera for simultaneously capturing multiple frames of images of the ultrafast phenomenon. The application has the advantages of simple structure, high stability, convenient operation, conventional elements, low cost for capturing the ultrafast phenomenon, flexible setting of the imaging time scale in the range of femtosecond or picosecond, and integration of multiple super-resolution and high-field methods.

The application discloses a laser welding method for glass-metal by ultrasonic spraying of nanoparticles, wherein the method fills the rough surface of the uneven connection interface by introducing nanoparticles, and the thickness of the nanoparticle layer can be controlled by adjusting process parameters, so that the requirement for polishing accuracy of the interface is greatly reduced, the interface can still be successfully welded by ultrashort laser under the condition of large roughness, the process flow is simplified, the process threshold is reduced, and the connection efficiency is improved; and the method can also realize stable connection of the interface without relying on high external pressure. The reason is that the nanoparticles selected based on the first principle can chemically react with elements in the metal or glass, and have the opportunity to form a metallurgical bonding layer, thereby greatly improving the connection efficiency and connection strength.

The invention relates to a method for efficiently producing ultra-thin elements (2, 4) of glass-based material, the material thickness (d) of which is between 5 m and 100 m, into which filiform damages (14) are introduced by irradiation with an ultra-short laser pulser, the distance (A) between adjacent filiform damages (14) being between 0.4 m and 4.0 m. This advantageously achieves high edge strength. The invention also relates to ultrathin elements (2, 4) of glass-based material and to the use thereof.

The present invention relates to a method for dividing a workpiece (1) having a transparent material, wherein a material modification (5) is introduced into the transparent material of the workpiece (1) along a dividing line (4) by means of ultrashort laser pulses of an ultrashort pulse laser (2), and subsequently the material of the workpiece (1) is divided along the resulting material modification surface (50) by a dividing step, wherein the laser pulses are brought onto the workpiece (1) at an attack angle (α), and the material modification (5) is of type I and / or type II modification associated with a refractive index change of the material of the workpiece (1).

Methods of synthesizing nanoparticles of an isotope using a laser beam are described herein. The methods include generating the laser beam, directing the laser beam to the target to convert the target into a plasma state, and bombarding the target in the plasma state with the laser beam to maintain the target in the plasma state and synthesize the nanoparticles of the isotope. During bombarding the target in the plasma state with the laser beam, the laser beam is configured to have a pulse frequency and peak laser intensity that accelerates electrons in the plasma state and maintains the plasma state at a temperature high enough to provide for the synthesis of the nanoparticles of the isotope. Apparatuses for synthesizing nanoparticles of an isotope using a laser beam are also described herein.

In certain embodiments, an ophthalmic laser system includes a laser source, a multifocal optic, scanners, a delivery optic, and a computer. The laser source generates an ultrashort laser pulse laser beam. The multifocal optic multiplexes the laser beam to create focal spots in a target along a propagation axis of the laser beam. The scanners direct the laser beam in x, y, and z directions. The delivery optic focuses the laser beam within the target to form focal spots in the target along the propagation axis of the laser beam. The computer instructs the scanners and the delivery optic to direct and focus the focal spots at the target according to a scan pattern.

The application provides a kind of laser damage detection method and detection system based on light spot online monitoring system, utilizes existing light spot online monitoring system to collect laser light spot image in real time, extracts laser light spot profile and diffraction ring features in light spot by low-pass filtering and high-pass filtering technology, calculates the motion relationship of light spot centroid and diffraction ring centroid, and judges damage risk in combination with correlation coefficient.The method can efficiently detect early laser damage, avoid the great loss caused by the traditional way when obvious damage is found.Because the original light spot online monitoring system of the system is used, no additional detection equipment is added, so it has the advantages of low cost, real-time response and good effect, and is suitable for laser damage detection of large ultrafast ultrashort laser device.

The invention relates to a device (10) for producing ultrashort laser pulses, said device having features of claim 1, and to a method for producing ultrashort laser pulses, said method having features of the additional independent claim.

The invention discloses a far-field signal-to-noise ratio measuring device and method for ultra-strong and ultra-short laser pulses, and belongs to the technical field of laser measurement. After ultra-short pulses to be measured pass through a beam splitter, a light path of signal light to be measured is adjusted by using a first reflector and a second reflector, and the moment when the signal light to be measured reaches a focus position is adjusted by using a delay line; the other path of reference light is subjected to frequency doubling by using a frequency doubling crystal and then is subjected to light splitting by using a dichroscope, the fundamental frequency light as the reference light is adjusted and delayed by a delay line and then reaches the same focal position as the signal light, interference occurs at the focal position, and gas is ionized to form a plasma grating; the frequency doubling light irradiates the plasma grating, diffraction light signals of the probe light under different time delay conditions are read through a CCD, and then signal-to-noise ratio data of the pulse to be measured are obtained through measurement; according to the invention, signal-to-noise ratio data of ultra-short and ultra-strong laser pulses at a far-field position is realized for the first time, and the device has the characteristics of simple optical path, convenient adjustment and accurate pre-pulse measurement for a small laser device.

The invention discloses a vacuum cavity system integrating double particle beams and a velocity imaging spectrometer and a method. The system comprises a vacuum cavity main body, a nano-particle beam source, an atom and molecule beam source, a speed imaging spectrometer, a laser transmission assembly and a synchronous control assembly, the nano-particle beam source and the atom-molecule beam source are respectively arranged on the vacuum cavity main body, particle beam paths are oppositely collinear, the axis of the speed imaging spectrometer is perpendicular to the particle beam paths and the laser transmission path in pairs, and the laser transmission assembly can be compatible with various optical wavebands and ultrashort laser pulses with femtosecond to attosecond magnitude pulse widths. The synchronous control assembly achieves cooperative work of all the components. According to the invention, ultrafast dynamic research on two different-scale particles of nanoparticles and atoms and molecules can be realized on the same device, frequent replacement of the device is not needed, the experimental efficiency is improved, the research cost is reduced, the accuracy and reliability of experimental data are ensured, and a comprehensive and efficient experimental platform is provided for ultrafast dynamic research.

An erbium fiber laser produces a beam of ultrashort laser pulses having a center wavelength greater than 780 nanometers, an average power greater than 0.5 watt, and a spectral bandwidth compressible to a pulse duration of less than 200 femtoseconds. The laser includes a fiber preamplifier that is energized by a counter-propagating pump beam, has relatively low population inversion in a relatively long optical gain fiber, and provides a spectrally-shaped beam for further amplification. Wavelength dependent gain and absorption within the optical gain fiber enhances longer wavelengths relative to shorter wavelengths in the spectrally-shaped beam. The spectral shaping is sufficient to overcome gain narrowing and gain shifting in a subsequent high-gain fiber amplifier.

The invention relates to the field of material science and surface engineering, and provides a surface treatment metal thin layer quality analysis method and system, and the method comprises the steps: collecting the data of a metal thin layer through a multi-mode detection system; processing data acquired by the multi-modal detection system through a convolutional neural network, extracting and fusing feature vectors, and generating classification results of surface defects, internal defects and chemical component distribution; collecting data in a thin layer forming process through an ultrafast laser spectrometer and a micro sensor which are embedded in the surface treatment equipment, and adjusting deposition parameters of the surface treatment equipment through a reinforcement learning algorithm; and updating the weight of the convolutional neural network through an incremental learning algorithm, and outputting an analysis report including defect types. By integrating computer vision, Raman spectrum and terahertz wave imaging, comprehensive analysis of surface defects, internal defects and chemical components of the metal thin layer is realized, the detection comprehensiveness is remarkably improved, and physical and chemical characteristics can be captured at the same time.

The invention discloses an ultra-large-mode-field ultra-low-numerical-aperture high-damage-resistance controllable optical waveguide structure and a method for improving the quality of an ultra-strong and ultra-short pulse laser beam, and particularly aims to solve the problem that the beam quality is reduced when the power of ultra-strong and ultra-short pulse laser is developed to be higher. The optical waveguide structure comprises a temperature control device, a cladding and gas, and in specific application, the temperature control device and the cladding can be separated and can also be combined into an integrated structure, so that the compactness and the stability of a system are improved. Laser transmission is placed in a cladding filled with gas, and gradient refractive index distribution is formed by means of gas temperature gradient in the cladding. Based on a light beam self-cleaning process in the gradient refractive index waveguide, gradient refractive index distribution caused by a gas temperature gradient can effectively guide laser transmission, and the light beam quality is improved. And the output beam quality of the laser is further optimized through the nonlinear effect (such as intermode four-wave mixing) interaction of the laser during transmission in the gas medium. The ultra-large-mode-field ultra-low-numerical-aperture high-damage-resistance controllable optical waveguide structure can be widely applied to transmission and amplification systems of ultra-strong and ultra-short laser, and has potential application value.

The invention provides a non-homologous laser pulse synchronization method, system and device and a medium. The non-homologous laser pulse synchronization method comprises the steps that reference laser pulses and to-be-locked signals are equally divided into two paths of reference laser pulses and two paths of to-be-locked signals; the relative position of any reference laser pulse and any to-be-locked signal is obtained, and the relative position of the other reference laser pulse and the other to-be-locked signal is obtained; and synchronizing the to-be-locked signals and the reference laser pulses according to the relative positions of the two reference laser pulses and the two to-be-locked signals. According to the non-homologous laser pulse synchronization method, the pulse time sequence can be automatically and continuously adjusted, and attosecond-level synchronization of ultra-short laser pulses is achieved.

The invention relates to a device for embedding a hollow channel-like filament (1) into a brittle fracture workpiece (2), wherein a focused laser beam (4) of a pulsed laser (3) having a wavelength lambda is directed to the workpiece for machining. The workpiece is transparent to the laser wavelength Lambda, and the filament (1) is produced by the incidence of at least one burst pulse packet of laser, where the burst pulse packet has a burst duration Tb and comprises a series of ultrashort laser pulses having a monopulse energy Ep and a burst internal delay Ti. The monopulse energy Ep0 of the laser pulse at the beginning of the burst duration Tb is greater than the monopulse energy Epx of the laser pulse at the end of the burst duration Tb. The subject matter of the invention also relates to some advantageous applications.

The application belongs to the technical field of laser, and relates to a high-energy ultrashort pulse laser. The laser comprises a mode-locked fiber laser oscillator, a nonlinear amplifier, a stretcher, a pulse selection module, a pre-amplification stage, a main amplification stage and a compressor. In the laser, the cavity dispersion of the mode-locked fiber laser oscillator is negative dispersion which is designed optimally, and the output pulse is injected into the nonlinear amplifier after pre-chirp management, so that a flat wide spectrum can be obtained; the stretcher, the pulse selection module, the pre-amplification stage, the main amplification stage and the compressor are combined to realize further efficient amplification of the injected pulse. The application can adopt a full polarization maintaining structure which has high stability and reliability, and realizes common use of nonlinear amplification and chirped pulse amplification technology, so that the gain narrowing problem in the traditional chirped pulse amplification process can be overcome, the single pulse energy amplification limit of the nonlinear amplification technology can be broken through, and finally the output of high-energy ultrashort laser pulse is realized.

The invention relates to a method for separating at least partially transparent material (1), wherein a single laser pulse and / or an ultrashort laser pulse comprising a plurality of sub-laser pulses is focused into the material (1) such that a modification zone (602) produced and elongated in the direction of beam propagation enters into the material (1) and penetrates at least one surface (14) of the material, wherein a material modification (3) is thereby introduced into the material (1), wherein a plurality of material modifications (3) are introduced into the material (1) along a separation line (2), and wherein the material (1) is subsequently separated along the separation line (2) by means of a separation step, and wherein the pulse energy of the single laser pulse or the sum of the pulse energies of the sub-laser pulses is in the range from 500 µJ to 50 mJ.

A method includes steps for creating at least two replicas of an input pulse to be characterised, varying the relative amplitude of the two replicas within a range, creating a nonlinear signal at each case of said amplitude variation, measuring the spectra of the nonlinear signals and recovering the spectral amplitude and phase of the input pulse with a proper algorithm. The system includes a replicator for creating at least two replicas of the input pulse and varying their relative amplitude within a range of relative amplitudes, a nonlinear medium, which obtains a nonlinear signal for each relative amplitude, and an analyzer, associated to the nonlinear signal, for measuring and characterising spectrally each nonlinear signal.

To provide an optical waveguide device in the field of mid-infrared photonics and a method for manufacturing such a device.SOLUTION: The device comprises a fluoride glass substrate having a local concentration of a chemical element at an internal contact and a waveguide inscribed along a path defined in the substrate. The waveguide is formed by directing a focused ultra-short laser pulse into the substrate and scanning the pulse to induce migration and densification of chemical elements at the inner contacts, resulting in a positive refractive index contrast. Fluoride glass substrates can include zirconium fluoride and modifiers such as barium fluoride, aluminum fluoride, and rare earth elements to enable optical gain. The described technology further encompasses an integrated photonics device including a waveguide laser with mirrors and gratings defining a laser cavity for use in sensing, communications, and laser systems.SELECTED DRAWING: Figure 1

The invention relates to a method for separating a workpiece (1), wherein material of the workpiece (1) is removed along a separation line (3) by means of a laser beam (20) comprising ultrashort laser pulses of an ultrashort pulse laser (50), wherein the material of the workpiece (1) is transparent to the wavelength of the laser beam (20) and has a refractive index of between 2.0 and 3.5, more preferably between 2.5 and 3.5, and the workpiece (1) is separated along a kerf (4) resulting from the removal of material in a separation step.

The application discloses a high-power spectrum wide tunable ultra-short pulse generation system, and belongs to the technical field of optoelectronic devices.The structure of the application is as follows: the output end of a seed pulse source (1) is connected with the input end of a first-stage power pre-amplification module (2), the output end of the first-stage power pre-amplification module (2) is connected with the input end of a pulse time-domain separation module (3), the output end of the pulse time-domain separation module (3) is connected with the input end of a Fourier time-space transformation shaping module (4), the output end of the Fourier time-space transformation shaping module (4) is connected with the input end of a second-stage power amplification module (5), the output end of the second-stage power amplification module (5) is connected with the input end of a polarization pulse synthesis module (6), and the output end of the polarization pulse synthesis module (6) is connected with the input end of a spectrum expansion module (7). The application can output ultra-short laser pulses, and has the advantages of high pulse power, spectrum tunability and the like.

The present disclosure relates to an optical waveguide device and a method for fabricating such a device in the field of mid-infrared photonics. The device comprises a fluoride glass substrate having localized concentrations of a chemical element at inscription points, with a waveguide inscribed along a defined path within the substrate. The waveguide is formed by directing focused ultrashort laser pulses into the substrate and scanning the pulses to induce migration and densification of the chemical element at the inscription points, resulting in a positive refractive index contrast. The fluoride glass substrate may include zirconium fluoride and modifiers such as barium fluoride, aluminium fluoride, and rare-earth elements to enable optical gain. The described technology further encompasses integrated photonic devices, including waveguide lasers comprising mirrors and gratings that define a lasing cavity for use in sensing, communication, and laser systems.