39 results about "Picosecond laser pulse" patented technology

A method of making an at least one hole in an optically transparent body comprises the following steps: (i) providing an ultrashort pulse laser for producing a laser output with a wavelength λ, the laser output having a subpicosecond laser pulse duration; (ii) providing a laser output focusing lens for focusing the laser output, the focusing lens having a numerical aperture NA; (iii) providing an optically transparent body, the optically transparent body having a transparency at λ of at least 90%/cm; (iv) providing a liquid filled container situated proximate to the optically transparent body, such that the optically transparent body is in direct contact with the liquid; and (v) directing the laser output through the focusing lens to produce a focused laser output with a subpicosecond laser pulse duration proximate the optically transparent body, wherein the focused laser output traces at least one hole track pattern through the transparent glass body while the optically transparent body and said focused laser output move relative to one another in X-Y-Z directions. The at least one hole track pattern is in contact with the liquid and the focused laser output, in conjunction with the liquid, creates at least one hole in the optically transparent body.

A solid condition kHz pico-second laser burst regenerative amplifier belongs to a omni-solid condition regenerative amplifier, which is characterized in that: the two lumen mirror of the magnifying resonant cavity are consisted of an average lumen formed by a first omni-opposite lumen mirror (7) and a second omni-opposite lumen mirror (14), the inner of the resonant cavity is arranged with a minus lens (12) and a second lambada/4wave plate (13) arranged between the laser crystal (9) which is a Nd:YAG bar and the second omni-opposite lumen mirror. The fast axis of the wave plate is parallel with the light vector of the inputting linearly-polarized light. The minus lens is arranged between the laser crystal and the second lambada/4 wave plate or the second lambada/4 wave plate and the second omni-opposite lumen mirror. The pump source is a continuously worked semiconductor laser diode array (10) and the working frequency is 1kHz. The laser crystal can also be a Nd:YLF bar, here the second lambada/4 wave plate is needless. The invention reduces the volume and the costs of the system, effectively solves the problem of Nd:YAD regenerative amplifier domino offect, and effectively ensures the magnification and the beam quality.

A pulsed fiber laser apparatus for outputting picosecond laser pulses can comprise a fiber delivered pulsed seed laser for providing picosecond optical seed pulses, and at least one optical fiber amplifier in optical communication with the fiber delivered pulsed seed laser. The optical fiber amplifier can comprise a gain optical fiber that receives and optically amplifies picosecond optical pulses by operating in a nonlinear regime wherein the picosecond optical pulses can be spectrally broadened by a factor of at least 8 during amplification thereof. The apparatus can further comprise a pulse compressor apparatus in optical communication with the optical fiber amplifier for providing compressed picosecond optical pulses. The pulse compressor apparatus can provide a dispersion of at least 50 ps/nm and can provide a compression ratio of the time duration of the picoseconds optical pulses received by the pulse compressor apparatus to the time duration of the compressed picosecond optical pulses of no greater than about 50.

The invention discloses a preparation method for a metal nano-particle ordered microstructure. The preparation method comprises the following steps that (1) a transparent substrate is cleaned up; (2) a layer of metal thin film is prepared on the surface of the transparent substrate by adopting a film coating process; (3) a reception substrate is taken and placed on a three-dimensional mobile platform controlled by a computer, the side, deposited with the metal thin film, of the transparent substrate makes contact with the reception substrate, irradiation is conducted from the side without the thin film with picosecond laser, and the ordered microstructure is deposited on the reception substrate; and (4) the reception substrate deposited with the ordered microstructure is added to a chemical compound solution containing AuCl-4 or PtCl2-6, mixing is conducted, a reaction is stopped when the color of the solution changes, and in this way, the gold or platinum nano-particle ordered microstructure is obtained on the surface of the reception substrate. According to the preparation method, the theories of picosecond laser pulses and metal replacement reactions are adopted, and metal with high reduction potential is replaced by metal with low reduction potential; the metal nano-particle ordered microstructure with the line width below 500 nm can be obtained. The preparation process is simple, high in efficiency and low in cost.

A metallic nano-particle surrounded by an amplifying medium results in a boundary condition that creates a singularity in the particle's dynamic polarizability at the localized surface plasmon resonance and at a critical value of the gain is disclosed. The boundary condition may be time dependent due to excitation by a sub-picosecond laser pulse and couples to the electromagnetic vacuum resulting in photon emission in an analogue of the Unruh Effect. The vacuum emission from 2-D nanostructures embedded in high gain laser dyes predicts energies nearly two orders of magnitude larger than the spontaneous emission background. The vacuum radiation is may have a unique dependence on the excitation.

The invention discloses a high-sensitivity optical fiber micro cantilever sensor for detecting acceleration. The sensor comprises an optical fiber, and one end face of the optical fiber is equipped with a mirror. A Fabry-Perot cavity is arranged in a coating layer of the optical fiber. The coating layer of the optical fiber is machined and etched with picoseconds laser pulse to get an optical fiber micro cantilever and an acceleration sensitive mass block. An optical fiber micro cantilever is arranged at one side of the Fabry-Perot cavity. An acceleration sensitive mass block is formed on a surface of the optical fiber micro cantilever. The acceleration sensitive mass block and the mirror constitute an interferometric optical fiber sensor. By using one communication optical fiber to integrate sensing and transmission, acceleration signal detection and transmission are realized, and remote real-time monitoring is realized. The sensor is small and light, and is suitable for acceleration monitoring in a limited space environment. The optical fiber cantilever is manufactured using the laser machining technology, manufacturing is quick and can be carried out on a large scale, and the manufacturing cost can be reduced.

The present invention relates to a method for detecting steel sample components by using a multi-pulse laser induced plasma spectral analysis device, and in particular, to a method for detecting steel sample components by using a multi-pulse laser induced plasma spectral analysis device that includes picosecond and nanosecond laser pulse widths. A laser induced light source is a laser light source that includes nanosecond and picosecond ultrashort pulses, and one pulse laser device can be used to generate two pulse lasers, namely, a nanosecond and a picosecond laser; the two pulse lasers pass through a same output and focusing light path, so as to ensure that the two pulse lasers are focused on a same position of a sample to be detected; a surface of the sample is irradiated by using a first beam of nanosecond laser pulse to generate plasmas; subsequently, the plasmas are irradiated by using a second beam of picosecond laser pulse to enhance spectral line emission.

The invention provides a high-energy picosecond laser pulse POD (Pulse on Demand) control system and a method. The system comprises a control circuit, an optical fast selection device, and a main optical clock. The main optical clock is connected with the control circuit. The control circuit is connected with the optical fast selection device. The main optical clock is used for emitting a base clock laser pulse signal and transmitting the base clock laser pulse signal to the control circuit. The control circuit is used for outputting a modulated pulse signal to the optical fast selection device according to the base clock laser pulse signal and a received external control pulse signal. The optical fast selection device is used for screening laser pulses emitted by a picosecond laser according to the modulated pulse signal. Every picosecond laser pulse required can be selected precisely from high-energy picosecond laser pulses as high as 1MHz. The POD function of the picosecond laser can be achieved. The laser output frequency can be modulated and changed in real time with external control signals.

Method to extract timing diagrams from synchronized single- or two-photon pulsed LADA by spatially positioning the incident laser beam on circuit feature of interest, temporally scanning the arrival time of the laser pulse with respect to the tester clock or the loop length trigger signal, then recording the magnitude and sign of the resulting fail rate signature per laser pulse arrival time. A Single-Photon Laser-Assisted Device Alteration apparatus applies picosecond laser pulses of wavelength having photon energy equal to or greater than the silicon band-gap. A Two-Photon Laser-Assisted Device Alteration apparatus applies femtosecond laser pulses of wavelength having photon energy equal to or greater than half the silicon band-gap at the area of interest. The laser pulses are synchronized with test vectors so that pass/fail ratios can be altered using either the single-photon or the two-photon absorption effect. A sequence of synthetic images with error data illustrates timing sensitive locations.

An ophthalmological device for treating eye tissue, with a femtosecond laser oscillator for generating femtosecond laser pulses and with a light projector for projecting the laser pulses onto or into the eye tissue in a focused fashion is moreover provided with a picosecond laser module for generating picosecond laser pulses. In the process, femtosecond laser pulses and/or picosecond laser pulses can selectively be fed to the light projector for treating the eye tissue. Hence, the ophthalmological device can selectively be used for performing precise cuts in the eye tissue by means of the femtosecond laser pulses and for fragmenting eye tissue by tissue fragmentation by means of the picosecond laser pulses.

The invention relates to a real-time in situ picosecond laser pulse auto-correlation meter. An incident light diaphragm component, a reflection mirror and a beam splitter are sequentially fixed along the advancing direction of incident pulse laser. The incident pulse laser is split into a first beam of light and a second beam of light through the beam splitter. The first beam of light is reflected to a right angle prism through the beam splitter, is reflected to the beam splitter through the right angle prism, and finally is transmitted to a first lens through the beam splitter. The second beam of light is transmitted to a retroreflector through the beam splitter, is reflected to the beam splitter through the retroreflector, and finally is reflected to the first lens through the beam splitter. The first beam of light and the second beam of light converge at a frequency doubling crystal through the first lens to produce a second harmonic signal. The second harmonic signal sequentially passes through a filter, a second lens, a diaphragm and a photodiode detector to generate an electrical signal, and the electrical signal is collected by a master control system. The real-time in situ picosecond laser pulse auto-correlation meter provided by the invention has the advantages of simple structure, low cost, easy operation, easy setting up, easy debugging, wide application range, and can continuously change the time range of the measured laser pulse.

The invention relates to a large-range picosecond laser pulse width measuring device. The device includes a first spectroscope, a second spectroscope, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a nonlinear crystal, a cylindrical mirror, a slit diaphragm, a first photoelectric detector, a second photoelectric detector and image processing unit. The device can realize the pulse width measurement of the measuring range of 0.3-50 ps.

The invention relates to a hundred picosecond pulse width measuring instrument which comprises a spectroscope, a first light guide reflector, a second light guide reflector, a non-linear frequency doubling crystal, an optical imaging system, a CCD (Charge Coupled Device) detector and a data acquisition and processing system, wherein the position relation of all components is shown as follow: an incident picosecond laser pulse to be measured divides a pulse to be measured into transmitted light and reflected light through the spectroscope; the transmitted light and the reflected light respectively pass through the first light guide reflector and the second light guide reflector and simultaneously enter into the non-linear frequency doubling crystal to generate a frequency doubling signal; and the frequency doubling signal is imaged on the CCD detector through the optical imaging system, and the data acquisition and processing system is used for finishing acquisition and data processing. The measuring instrument has the maximum measurable pulse time range of 150ps and the resolution ratio of 0.2ps.

The invention discloses an on-chip photon multi-stage switch based on a Si-Ge2Sb2Te5 mixed waveguide, and belongs to the technical field of picosecond laser and continuous laser application. The on-chip photon multi-stage switch is based on a laser multi-pulse effect and an evanescent wave coupling theory. Amorphous Ge2Sb2Te5 is directly coupled with a single-mode Si waveguide, a Ge2Sb2Te5 thin film is deposited through a magnetron sputtering method, and different crystalline states of the Ge2Sb2Te5 are adjusted by adjusting the picosecond laser pulse number and pulse energy to achieve multi-stage switching operation. The on-chip photon multi-stage switch does not need to maintain the energy consumption of a traditional optical switch caused by the thermo-optic effect and the electro-opticeffect, and is a green device. In addition, the Ge2Sb2Te5 has different optical constants in different crystalline states, and the crystalline refractive index and extinction coefficient of the Ge2Sb2Te5 are higher than those of the Ge2Sb2Te5 in an amorphous state, so that the coupling capacity of a material to light and the absorption capacity of the material to the light are different, and multi-stage operation is further realized. The on-chip photon multi-stage switch can be widely applied to optical communication systems.