70 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.

A method for generating ultrawideband pulsed microwave signals from optical field ionization of a gas with an ultrashort laser pulse, where the amplitude and frequency of the signals can be controlled via the characteristics of the laser pulse and / or the gas. The center frequency of the spectrum of the microwave signal can be controlled by changing the laser pulse energy. The amplitude of the microwave signal can be controlled by changing the wavelength of the laser pulses. The amplitude and frequency of the microwave signal can be tuned by controlling the pressure of the gas medium. The location at which the microwave signal is generated can be controlled by controlling the location at which the laser pulse creates a plasma. Interference among microwave signals resulting from multiple laser-produced plasmas can be used to construct an ultrawideband microwave signal having a predetermined amplitude and frequency.

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 method is disclosed for the use of lasers to realize stable super-hydrophilicity in transparent in the visible spectrum solid surfaces, coatings and devices employing transparent in the visible spectrum solids and ultrashort laser pulses. The lasers are used to shape surfaces of the transparent solid materials and generate a desired nanostructure pattern on the surfaces without affecting, contrariwise enhancing the transmissivity of the material, resulting in acquired anti-fogging properties under high humidity environments. More specifically the methods and devices for creating stable anti-fog effects of transparent in the visible solids as well as the devices employing laser nanotextured, transparent in the visible, solids, are disclosed.

The present invention relates to the field of spintronic technologies, and discloses an optical method for dynamically regulating the propagation direction of spin waves. Based on the excitation of spin waves by an ultrashort laser pulse, a liquid crystal spatial light modulator is used to dynamically shape the excitation light field, modulate the amplitude and phase of the excitation light field, obtain an arbitrarily controllable pulsed excitation light field distribution on the surface of a magnetic medium, and further generate a desired instantaneous spin wave source field, thereby realizing the dynamic regulation of the propagation direction of spin waves. This method can be controlled by a computer and has the advantages of flexibility, real-time performance, programmability, etc.

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.

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 pulse duration less than 200 femtoseconds. The fiber laser includes an erbium fiber amplifier that is energized by a pump beam having a pump wavelength longer than 1520 nanometers. The pump wavelength is selected to provide uniform gain over the broad spectral bandwidth of a seed beam and minimal gain at shorter wavelengths in the fiber amplifier, thereby overcoming gain narrowing and gain shifting. The pump beam has sufficient power to achieve pump saturation in the fiber amplifier.

The invention discloses a method for generating a high-stability supercontinuum light source based on a solid slice, which is as follows: S1: placing at least one solid slice on a two-dimensional or multi-dimensional micro-displacement platform; S2: after an ultrashort laser pulse converges and enters a certain irradiation area on the front surface of the solid slice, a nonlinear optical effect is generated during the propagation process in the solid slice to achieve spectrum broadening; S3: an optical power probe is simultaneously used to sample and detect the ultrashort laser pulse after the action on the solid slice, so as to achieve real-time measurement and recording of the power of the sampled beam; S4: based on the detected power value, the variation amplitude of the real-time power relative to the initial power is calculated, thereby obtaining a quantitative evaluation of the aging condition of the solid slice; S5: a main control system issues a control instruction to control the micro-displacement platform to move according to a pre-set motion mode, so as to achieve continuous updating of the irradiation area of ​​the solid slice, thereby achieving an ultrashort pulse light source for generating a high-stability supercontinuum.

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 utility model discloses a picosecond square wave amplification system based on a photonic crystal fiber, which is characterized by comprising an oscillator used for outputting a laser pulse; the isolator is used for preventing the seed light from being fed back into the oscillator; the stretcher is coupled to the oscillator and is used for expanding the pulse width of the laser pulse output by the oscillator; the pulse shaping device is used for processing the laser pulse, the pre-amplifier is used for amplifying the average power of the laser pulse processed by the stretcher, the pulse shaping device comprises a 4f amplitude modulation system based on a liquid crystal spatial light modulator (SLM), and the 4f amplitude modulation system comprises a grating G1, a grating G2, a concave mirror M1, a concave mirror M2 and the liquid crystal spatial light modulator. The utility model relates to the technical field of laser amplification systems, and the system can realize real-time and controllable pulse amplitude shaping of ultrashort laser pulses through a liquid crystal spatial light modulator so as to obtain pulses with specific shapes, such as square wave pulses.

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.

A system includes an ultrashort pulse laser for providing a laser beam, a hollow core fiber, an input coupling optical unit configured to input couple the laser beam into the hollow core fiber, a lens device on which an output coupled laser beam from the hollow core fiber is incident, a beam shaping element on which the laser beam emerging from the lens device is incident, and a focusing optical unit. The lens device is configured to adjust a divergence angle of the output coupled laser beam for adjusting a beam diameter of the laser beam on the beam shaping element. The beam shaping element is configured to impose upon the laser beam a quasi-non-diffractive beam shape with a focal zone that is elongated in the beam propagation direction. The focusing optical unit is configured to set a penetration depth of the focal zone in or on the material.

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).

A manufacturing method includes the following steps: forming a semiconductor structure, wherein the semiconductor structure comprises a wafer, a plurality of dummy gates and a dielectric layer, and the dummy gates are formed on the wafer, and the dielectric layer is formed on the dummy gates; forming an epitaxy layer between adjacent two of the dummy gates, wherein there is a nodule remained on the dielectric layer in process of forming the epitaxy layer; and removing the nodule by using an ultrashort laser beam.

The invention relates to a device for inserting a hollow-channel filament (1) into a brittle workpiece (2), wherein a focused laser beam (4) of a pulsed laser (3) with a wavelength λ is directed onto the workpiece for processing. The workpiece is transparent to the wavelength λ of the laser, and the filament (1) is produced by irradiation with at least one burst packet of laser pulses, wherein the burst packet has a burst duration Tb and comprises a sequence of ultrashort laser pulses having a single-pulse energy Ep and an intra-burst delay Ti. The single-pulse energy Ep0 of the laser pulse at the beginning of the burst duration Tb is greater than the single-pulse energy Ep x of the laser pulse at the end of the burst duration. Advantageous applications are also the subject of the invention.

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 invention provides a double-optical-path Z-scanning nonlinear optical measurement device and method, and belongs to the technical field of nonlinear optical measurement. The device comprises a pulse laser used for emitting ultra-short laser pulses; the beam splitter BS1 is used for splitting the ultrashort laser pulse into probe light and pump light; the detection light is focused on a sample to be detected through the lens L1; the pump light is focused on a sample to be detected through a lens L2; and the beam splitter BS2 is used for splitting the detection light penetrating through the sample to be detected into two beams, and the two beams are respectively conveyed to the hole opening detector D1 and the hole closing detector D2. By adopting the double optical paths, the problems that the temperature of a sample is possibly increased due to long-time laser irradiation, so that a heat effect is caused, and laser scattering is caused by unevenness of the surface of the sample or irregularity of an internal structure can be effectively solved.

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.

A method and apparatus for inscribing a Bragg grating in an optical waveguide, comprising: providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the electromagnetic radiation has a pulse duration of less than or equal to 5 picoseconds, and wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 microns (μm): providing cylindrical focusing optics corrected for spherical aberration: 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 intense to cause the permanent change in the index of refraction in the core of the optical waveguide.