16 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 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 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 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 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 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 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.