46 results about "Ultrashort laser" patented technology

The invention discloses a miniaturized ultra-strong and ultra-short laser dispersion compensation device and method. The miniaturized ultra-strong and ultra-short laser dispersion compensation device comprises a stretcher, a pre-compensation compressor, an amplifier and a compressor. The pulse laser is firstly broadened by the stretcher, partial second-order and third-order dispersion is compensated by the pre-compensation compressor, partial high-order dispersion is increased, then the pulse laser is amplified by the amplifier, and finally the pulse laser is compressed to be close to the Fourier limit pulse width by the compressor. According to the invention, the pulse laser can be broadened to hundreds of picoseconds or even nanoseconds to be amplified under the existing condition and then compressed to be close to the Fourier limit pulse width, and good light beam quality is ensured.

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.

Methods and systems for the generation of non-lethal and lethal effects using ultra-short pulse lasers. A laser source generates pulses at the direction of a controller and directs the pulses along an optical path to one or more high-speed beam steering devices, also directed by the controller, which then directs the laser pulses to achieve the desired effects. A computerized controller receives a specification of one or more desired effects for one or more targets and calculates a distribution of ultra-short laser pulses as well as the required characteristics for each of the pulses.

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

A high-performance single-shot contrast measurement device with real-time self-verification of accuracy is characterized in that the sampling light of the single-shot contrast measurement device is obtained based on spectral broadening and spectral filtering in a self-phase modulation process, so that the sampling light has high contrast, high energy, and a large difference from the central wavelength of the incident light, and good stability; at the same time, the sampling light introduces a series of intensities through a pulse replication unit to be attenuated in sequence, and is offset at equal intervals in position. The sampling light is also evenly spaced in time for self-verification of the measurement accuracy of the measurement device. This invention realizes the characteristics of single-shot contrast measurement with high measurement dynamic range, wide time window, high time resolution, high measurement fidelity, simple and compact device, and real-time verification of the accuracy of measurement results, providing better support for improving the contrast of ultra-strong and ultra-short laser pulses and related laser-matter interaction experimental research.

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 application discloses a kind of middle-long wave infrared shallow slot deep broadband all-dielectric reflection grating and preparation method thereof, belong to the technical field of infrared optical device.The grating is composed of bottom grating film and top shallow slot deep diffraction grating, bottom grating film and top shallow slot deep diffraction grating cooperate and modulate Bloch mode reflection phase, and the diffraction efficiency of-1 level is higher than 99% in 3-14 μm wave band range.Preparation method includes: sequentially depositing functional film layer on substrate, and forming shallow slot deep grating structure by patterning etching.The application adopts the design of all-dielectric shallow slot deep grating, avoids the preparation difficulty of middle-long wave infrared diffraction grating, and has the performance of wide angular spectrum, ultra-wide band, high diffraction efficiency and high damage threshold.The application provides a solution to the preparation condition limitation of middle-long wave diffraction grating, accelerates the application of diffraction grating in middle-long wave infrared, and promotes the development of middle-long wave infrared high-energy laser spectrum beam combination system, ultra-short laser pulse compression and spectrometer system.

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.

A method for amplifying an ultrashort laser pulse includes: a) stretching the ultrashort laser pulse in time, b) amplifying the time-stretched laser pulse, c) compressing the amplified time-stretched laser pulse, with at least one gain phase contribution selected from a group consisting of a gain dynamics phase contribution of the laser pulse that emerges as a change in a nonlinear phase on account of gain dynamics in step b), a gain bandwidth phase contribution of the laser pulse that emerges as a change in the nonlinear phase on account of a gain bandwidth in step b), and a combination thereof, being compensated by virtue of d) an additional phase contribution being imparted on the laser pulse prior to step c) and / or e) a spectrum of the laser pulse being changed, in such a way that the at least one gain phase contribution is compensated after step c).

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).

The invention provides a laser damage detection method and system based on a light spot on-line monitoring system, and the method comprises the steps: collecting a laser spot image in real time through an existing light spot on-line monitoring system, and extracting the contour of a laser spot and the characteristics of a diffraction ring in the laser spot through a low-pass filtering technology and a high-pass filtering technology; and calculating the motion relation between the light spot centroid and the diffraction ring centroid, and judging the damage risk in combination with the correlation coefficient. According to the method, early laser damage detection can be efficiently carried out, and great loss caused when obvious damage is found in a traditional mode is avoided. Because an original light spot on-line monitoring system of the system is utilized and no extra detection equipment is added, the system has the advantages of low cost, real-time response and good effect, and is suitable for laser damage detection of a large-scale ultrafast and ultrashort laser device.

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.

The invention relates to a titanium sapphire bonded crystal low-temperature cooling module for laser with high peak power and high repetition frequency. The titanium sapphire bonded crystal low-temperature cooling module is characterized by mainly comprising a titanium sapphire bonded crystal, a heat sink crystal frame, a vacuum chamber with an air exhaust interface and an optical window, a low-temperature cooling chamber with a cooling medium inlet / outlet interface and the like. The titanium sapphire bonding crystal is installed on the heat sink crystal frame, one end of the titanium sapphire bonding crystal and one end of the heat sink crystal frame are arranged in a vacuum chamber with an air exhaust connector and an optical window, and the light passing face of the titanium sapphire bonding crystal is opposite to the optical window on the vacuum chamber. And the other end of the heat sink crystal frame is arranged in a low-temperature cooling chamber with a cooling medium inlet / outlet interface. According to the invention, the generation of transverse parasitic oscillation in the titanium sapphire bonded crystal can be inhibited, ultralow-temperature cooling of the titanium sapphire bonded crystal can be realized, and the repetition frequency and peak power of laser pulses output by an ultra-strong and ultra-short laser system can be further improved.

The invention relates to a laser system for generating secondary radiation (108) by interaction of a focused primary laser beam (104) with a target material (106), the laser system comprising: a laser beam source (102) for providing a raw laser beam (110) having ultra-short laser pulses; a target region (114) for arranging a target material (106); a beam guiding device (112) for forming a focused primary laser beam (104) from the raw laser beam (110), the focused primary laser beam (104) being guided to a target region (114) for interacting with a target material (106) arranged in the target region (114), the beam guiding device (112) having a beam focusing device (126) for focusing the focused primary laser beam (104) with the target material (106) arranged in the target region (114), a beam focusing device (126) arranged to form a primary laser beam (104) by focusing a laser beam (129) entering the beam focusing device (126), the laser beam (129) entering the beam focusing device (126) being based on or corresponding to the original laser beam (110), and wherein the beam focusing device (126) has at least two spherical mirror elements (154, 156; 176, 180) is provided. According to the invention, when the primary laser beam (104) propagates in a medium having a refractive index of less than 1.01, the numerical aperture of the beam focusing device is between 0.001 and 0.01.

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 present invention relates to an apparatus and to a method for processing a workpiece (1) made of a birefringent material having at least one optical axis (OA) by means of ultrashort laser pulses of a laser beam (20) from an ultrashort pulse laser (2), wherein the laser beam (20) is given a non-diffractive beam shape by a beam shaping device (3), wherein the laser beam (20) is given a polarisation distribution by a polarisation shaping device (4), wherein the laser beam (20) is focussed by processing optics (5) into a focal zone in a focal plane in the workpiece (1), wherein the workpiece (1) is irradiated with the laser beam and thereby processed, wherein the polarisation distribution compensates for the birefringence of the material of the workpiece (1).

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.