251results about "Optical devices for laser" patented technology

The invention relates to the technical field of lasers, and provides a double-gain-medium Q-switched laser and a constant-power pulse width adjusting method.The laser comprises a first pumping source, a second pumping source, an optical fiber beam combiner, a beam shaping system and a laser resonant cavity, the laser resonant cavity comprises a reflecting mirror, a first gain medium, a second gain medium, a polarization selector, a quarter-wave plate, a Q switch and an output mirror which are arranged in sequence; the first gain medium is used for absorbing first pumping light, the second gain medium is used for absorbing second pumping light, and the pumping power of the first pumping source and the pumping power of the second pumping source can be independently controlled. By changing the pumping power of the two pumping sources, real-time adjustment of the pulse width of the laser under the constant output power is achieved, the structure is compact, and control is easy and convenient.

A method and system for generating deep ultraviolet (DUV) laser light is disclosed, in one embodiment the DUV laser system includes a fiber laser source configured to emit a poised fundamental laser beam in the near-infrared with a pulse duration of less than 400 femtoseconds (fs), a nonlinear crystal assembly comprising first, second, and third nonlinear crystals that is configured to convert the fundamental laser beam to produce a fifth harmonic laser beam having a wavelength in a range from 200 nanometers (nm) to 230 nm, and at least one compensation plate disposed in at least one position preceding at least one of the first, second, and third nonlinear crystals and configured such that a pair of pulsed laser beams transmitted through the at least one compensation plate are spatially and temporally overlapped within the at least one of the first, second, and third nonlinear crystals.

Provided is a laser lift-off apparatus, and a substrate lift-off method using a laser lift-off apparatus. The laser lift-off apparatus is configured to convert a first beam into a second beam having a width in a first direction and in a second direction different from the first direction, the laser lift-off apparatus including a laser beam generator configured to generate the first beam, a homogenizer configured to homogenize the first beam, and a beam cutter including a first beam cutter and a second beam cutter defining at least two openings having different respective lengths in the first direction, and configured to generate the second beam by transmitting and blocking respective portions of the first beam.

A quantum computing system, comprising: an optical source for generating a continuous-wave, cw, optical carrier signal at a carrier wavelength; a confinement chamber; and optical intensity modulation apparatus comprising; an optical modulator operative to modulate the continuous-wave, cw, optical carrier signal to generate at least one sideband on the optical carrier signal, a radio frequency, RF, signal generator, operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating having a central reflection wavelength corresponding to one of said sideband(s); and optical routing apparatus configured to direct the optical carrier signal and the at least one sideband to the first optical waveguide grating; and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal to be delivered to the confinement chamber.

An optical assembly to be used between a target positioned within a vacuum chamber and a laser source comprises: a housing; a frame; a lens carried by the frame; a plurality of spiral flexures each having a respective proximal end coupled to the frame; a plurality of flexure actuators, each flexure actuator coupled between the housing and a distal end of a respective spiral flexure; and a plurality of translation actuators coupled between the housing and the frame, wherein the frame includes a pair of elongate passageways orthogonal to one another and wherein each translation actuator comprises a motor having an eccentric output shaft received within a respective elongate passageway.

A laser device includes an oscillator outputting pulse laser light; an amplifier amplifying the pulse laser light; an optical pulse stretcher extending a pulse width of the pulse laser light; a beam divergence angle adjuster including an upstream lens arranged on an optical path of the pulse laser light, a downstream lens arranged downstream of the upstream lens, and an optical path length changing mechanism for changing an inter-lens optical path length between the upstream lens and the downstream lens; and a processor controlling the beam divergence angle adjuster and obtaining a repetition frequency or a duty of the pulse laser light, and to change, when the repetition frequency or the duty changes by a preset threshold or more, the inter-lens optical path length so that the beam divergence angle of the extended pulse laser light becomes small in accordance with the repetition frequency or the duty after the change.

The disclosure relates to an optical system comprising a laser source (1) which generates pulsed laser radiation consisting of a temporal sequence of laser pulses in an input laser beam (EL), a splitting element (2) which follows the laser source (1) in the course of the beam and splits each of the laser pulses into laser pulse replicas separated spatially and / or temporally from one another, a combination element (4) which follows the splitting element (2) in the course of the beam and superimposes the laser pulse replicas in a respective laser pulse in an output laser beam. It is the task of the disclosure to provide an improved optical system compared to the prior art. It should be possible to generate particularly short and thus spectrally broadband laser pulses of high power with the optical system. The disclosure proposes that at least one multipass cell (3) is arranged in the beam path between the splitting element (2) and the combination element (4), through which the laser pulse replicas propagate, wherein the multipass cell (3) contains a medium in which the laser pulse replicas undergo nonlinear spectral broadening.

A laser system comprises a femtosecond laser, and a beam delivery system configured to deliver and scan a laser beam emanating from the femtosecond laser onto wood, based on a desired graphene design, wherein graphene is formed on the wood by the laser beam. A device capable of being fabricated by the laser system may include a temperature sensor which detects a temperature by measuring resistance of the graphene, a heater or a boiler which converts electrical energy to thermal energy, or electrical interconnects.

A new laser beam transport system comprises a structure and at least one detector. The structure comprises an inner tube, defining an input end and an output end, and an outer tube surrounding the inner tube so as to define a volume therebetween. The volume is closed such that ambient radiation cannot enter the volume. The at least one detector is configured to detect the presence of radiation in the volume and operable to generate a signal if an amount of radiation above a threshold level is detected. A new laser system comprises such a laser beam transport system and a radiation source operable to generate a radiation beam that propagates through an interior volume defined by the inner tube, from the input end to the output end. A new laser-produced plasma radiation source comprises such a laser system.

A hybrid coherent beam combining (CBC) and spectral beam combining (SBC) fiber laser amplifier system including a beam shaper array assembly and a beam source that provides a plurality of beams having a low fill factor profile. The assembly includes an input beam shaper array having a plurality of rectilinear input cells positioned adjacent to each other that are shaped to cause the beam to expand as it propagates away from the input array to be converted from the low fill factor profile to a high fill factor profile. The assembly further includes an output beam shaper array having a plurality of output cells positioned adjacent to each other that are shaped to cause the beam to stop expanding so that the output array provides a plurality of adjacent beams with minimal overlap and a minimal gap between the beams.

The invention relates to a device (10) for amplifying a laser pulse which comprises a divider section (14) for dividing the laser pulse into multiple sub pulses (43) and for introducing a time delay between the sub pulses (43), a compressor section (15) for compressing the temporally divided sub pulses (43) and a combiner section (17) for combining the compressed sub pulses (44) to one compressed laser pulse (45).

A pulse generation unit generates a driving voltage signal including a pulse signal. A laser oscillation module oscillates a laser beam by carrying out, based on the driving voltage signal, a pulse oscillating operation. When the power command signal has a voltage command value corresponding to a laser power greater than a predetermined laser power during a high period, the pulse generation unit modulates, in a pulsed manner, a voltage value of the high period of the driving voltage signal so as to alternately repeat, for a preset period of time from a rising time of the high period of the driving voltage signal, a high state in which the voltage value is maintained and a low state in which the voltage value is lowered by a predetermined voltage value without being lowered to a voltage value of a low period of the driving voltage signal.

An impulse width expansion device of one aspect of the present disclosure has a polarization beam splitter and a transfer optical system. The transfer optical system has: a 1 / 4 wave mirror pair including a first 1 / 4 wave mirror that reflects a pulse laser with a phase shift of 1 / 4 wavelength and a second 1 / 4 wave mirror that reflects the pulse laser after the reflection by the first 1 / 4 wave mirror with a phase shift of 1 / 4 wavelength; and a mirror pair that is disposed on an optical path before and after the 1 / 4 wave mirror pair or an optical path between the 1 / 4 wave mirror pair. The transfer optical system transfers an image of the input pulse laser in the polarization beam splitter on an optical path between the 1 / 4 wave mirror pair as a first transfer image at equal magnification, and transfers the first transfer image in the polarization beam splitter as a second transfer image at equal magnification.

This invention discloses a high-speed sweeping fiber optic light source. The specific device includes: a mode-locked pulse light source, an optical fiber amplifier, a highly nonlinear optical fiber, and a dispersion-compensating optical fiber. The passively mode-locked pulse light source outputs a high repetition rate, wide-spectrum mode-locked pulse. Its dispersion propagation follows a parabolic differential equation similar to one-dimensional paraxial diffraction, analogous to Fraunhofer diffraction. The pulse is amplified outside the cavity by an optical fiber amplifier to increase the laser pulse energy and peak power. Then, it is broadened by the highly nonlinear optical fiber to obtain a supercontinuum light source. Finally, the pulse is stretched by a highly dispersive medium provided by the dispersive optical fiber, and the pulse frequency domain spectrum is mapped to a time domain waveform, thereby realizing a high-speed sweeping frequency light source in the time domain.

A laser assembly, including a first CW laser having a first fiber optic cable operationally connected thereto for directing a first CW laser output, a second QCW laser having a second fiber optic cable operationally connected thereto for directing a second QCW laser output, and a third Q-switched laser having a third fiber optic cable operationally connected thereto for directing a third Q-switched laser output. A fusion point is operationally connected to the first, second, and third fiber optic cables for combining the first, second, and third laser outputs into a composite output. A fourth fiber optic cable is connected to and extends from the fusion point for directing the composite output.

To provide a laser device configured so that a bypass device is attachable thereto and detachable therefrom.SOLUTION: There is provided a bypass device 60 that is attachable to and detachable from a laser device outputting pulse laser light, and provided in the laser device 2A to form a bypass optical path bypassing a pulse width stretching device 50 extending a pulse width of incident pulse laser light, and comprises: a plurality of optical elements forming the bypass optical path; and a housing 65 housing the plurality of optical elements. Therein the plurality of optical elements each include: a first highly reflective mirror 61 reflecting the pulse laser light entering the pulse width stretching device outward from the pulse width stretching device to lead it to the bypass optical path; and a second highly reflective mirror 64 reflecting the pulse laser light reflected by the first highly reflective mirror and made incident through the bypass optical path to cause it to return to an emission optical path of the pulse width stretching device.SELECTED DRAWING: Figure 2

A generator device for generating an arbitrary optical pulse pattern includes:a light source to provide primary laser pulses,a distributor to provide a plurality of primary optical pulses by distributing light of the primary laser pulses (LB00k) into a plurality of branches,a combiner to form an output signal by combining modulated optical signals from the branches, anda controller unit to provide control signals for controlling optical modulators of the branches,wherein a first branch comprises a first optical modulator to form a first modulated optical signal from primary optical pulses of the first branch,wherein a second branch comprises a second optical modulator to form a second modulated optical signal from primary optical pulses of the second branch, andwherein a propagation delay of the second branch is different from a propagation delay of the first branch.

The application discloses a kind of fixed frequency and variable frequency multi-pulse laser emitting device, including three polaroids, four dichroic mirrors, reflecting mirror and four groups of cavities, each group of cavities includes back mirror, electro-optic Q switch and crystal.The first cavity emits first time pulse laser, interval time dt1 after second cavity emits second time pulse laser, then after interval time dt2, third cavity emits third time pulse laser, and after interval time dt3, fourth cavity emits fourth time pulse laser, repeat this process to form multi-pulse laser, wherein interval time dt1 is equal to interval time dt3, interval time dt2 can be continuously adjustable, to form fixed frequency and variable frequency multi-pulse laser.The device of the application can realize multiple trigger laser distribution results with adjustable time interval in a single sampling period, and further realizes the measurement of high time resolution of flow field, improves test efficiency.

This invention belongs to the field of laser pulse polarization control technology, and discloses a high-intensity laser pulse polarization state control system and method. The system includes a laser, a polarization controller, a processing device, and a central control unit. The laser generates and outputs laser pulses; the polarization controller receives the laser pulses emitted by the laser and rapidly adjusts their polarization direction; the processing device applies the polarization-adjusted laser pulses to the processing material; and the central control unit is electrically connected to the laser, polarization controller, and processing device to achieve synchronous control of these components. This invention, employing the aforementioned high-intensity laser pulse polarization state control system and method, achieves a technological breakthrough in ultra-intense laser polarization control through the innovative application of plasma media, possessing high tolerance, high precision, and adaptability, filling a technological gap in this field.

A fiber laser device (1) is provided with: a first excitation light source (12) capable of emitting first excitation light; a first amplification optical fiber (11) to which an active element that absorbs the first excitation light is added, and which amplifies and emits the light of the first wavelength; a second amplification optical fiber (21) to which an active element that absorbs the light of the first wavelength and is the same as the active element added to the first amplification optical fiber (11) is added, and which amplifies and emits the light of the second wavelength; beam combiners (31), (32); and a light attenuation unit (60) that is provided on an optical path between the beam combiners (31, 32) and the first amplification optical fiber (11), transmits light from the first amplification optical fiber (11), and suppresses the transmission of light from the beam combiners (31, 32).

This laser device is provided with: a laser oscillator which includes an optical resonator and a pair of electrodes for generating discharge by applying a voltage to a laser gas, and which outputs a first pulsed laser light; a first optical pulse stretcher that transmits a portion of the first pulse laser light, surrounds the other portion of the first pulse laser light by one circle, and outputs a first transmitted light and a first one-circle surrounding light, which have a first shift amount and spatially overlap a portion of the first transmitted light and the first one-circle surrounding light, thereby outputting a second pulse laser light in which the pulse time width of the first pulse laser light has been expanded; and a second optical pulse stretcher that transmits a part of the second pulse laser light, surrounds the other part of the second pulse laser light by one circle, and outputs second transmitted light and second one-circle surrounding light that have a second offset amount different from the first offset amount and spatially overlap a part of the second transmitted light and a part of the second one-circle surrounding light. As a result, a third pulse laser beam having an extended pulse time width of the second pulse laser beam is output.

A method and apparatus for protecting a seed laser in a laser-generated plasma (LPP) extreme ultraviolet (EUV) optical system are disclosed. An isolation stage positioned in the optical path deflects light reflected from further components in the LPP / EUV optical system to prevent it from reaching the seed laser. The isolation stage includes two isolation elements separated by a delay line. The AOMs, when open, guide light into the optical path, and when closed, guide light away from the optical path. The delay introduced by the delay line is determined such that the opening and closing of the AOMs can be timed to guide forward-moving pulses into the optical path and deflect reflected light at other times. The isolation stage can be positioned between gain elements to prevent amplified reflected light from reaching the seed laser and other potentially harmful effects.

The invention concerns laser system (18) in which a relay unit (64.1, 64.2) is configured such that a light beam (22) can be deflected at a first deflection element (74.1) out of a first relay plane (78.1) into a second relay plane (78.2) different from the first relay plane (78.1) and towards the second deflection element (74.2), wherein the relay planes (78.1, 78.2) extend essentially horizontally.

An optical fiber having a first core and a second core, wherein the first core has an active dopant, the first core and the second core are separated by a first cladding, the first cladding has a first refractive index smaller than the refractive index of the first core and the second core, and when the optical fiber is composed of a straight line or a uniform radius of curvature, a first optical mode can propagate along the second core but is isolated from the active dopant, and when the optical fiber is perturbed, the first optical mode is coupled to a second optical mode that overlaps with the active dopant, the pump radiation propagates along the second core as the first optical mode, the perturbation selectively couples the first optical mode to the second optical mode, and the pump radiation coupled to the second optical mode is absorbed by the active dopant, which can amplify the signal mode guided by the first core by stimulated emission, thereby enabling control of at least one of the inversion ratio of the active dopant, optical gain characteristics, and thermal load.

A first optical port of vapour cell 1 receives a probe laser beam which leaves the cell via a second optical port. A first portion of the emerging probe beam is directed to optical modulator 3 which a

Optical intensity modulation apparatus (100) comprising: an optical modulator (102) operative to modulate a continuous-wave optical carrier signal at a carrier wavelength to generate at least one sideband on the optical carrier signal; a radio frequency, RF, signal generator (104) operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating (108) having a central reflection wavelength corresponding to a said sideband; and optical circulator (106) configured to direct the optical carrier signal and the at least one sideband to the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal. The RF signal generator is operative to switch the drive signal on and off so as to form an intensity modulated output optical signal.

an optical intensity modulation device (100) comprising: an optical modulator (102) operative to modulate a continuous wave optical carrier signal at a carrier wavelength to generate one or more sidebands on the optical carrier signal; a radio frequency (RF) signal generator (104) operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating (108) having a center reflection wavelength corresponding to the sidebands; and an optical circulator (106) configured to direct the optical carrier signal and the one or more sidebands into the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal, wherein the RF signal generator is operative to switch the drive signal on and off to form an intensity modulated output optical signal.

A control unit for use in a laser system for working a workpiece by a laser beam is configured to capture, based on at least one translation axis position, a translational position of a working head which can be changed by a movement unit, capture, based on at least one rotation axis position, a rotational orientation of the working head which can be changed by the movement unit, and issue or revoke a laser beam release for an application of the laser beam to the workpiece. The laser beam release depends on a serial test of the translational position and the rotational orientation of the working head.

An apparatus for combining a plurality of coherent laser beams includes a splitting device configured to split an input laser beam into the plurality of coherent laser beams, a plurality of phase setting devices configured to adjust a respective phase of one of the plurality of coherent laser beams, and a beam combining device configured to combine the plurality of coherent laser beams, which emanate from a plurality of grid positions of a grid arrangement. The beam combining device includes a microlens arrangement having at least two microlens arrays. The apparatus further includes a controller configured to adjust a respective phase of a respective one of the plurality of coherent laser beams and / or vary a respective phase of a respective one of the plurality of coherent laser beams.

The invention relates to a constant temperature control method and device for an optical crystal and a laser, and the control method comprises the following steps: S1, collecting the temperatures of at least two different positions of the optical crystal in real time, so as to obtain at least two actually measured temperature values reflecting the internal thermal state of the crystal; s2, acquiring at least one external disturbance parameter influencing the temperature of the optical crystal in real time; s3, based on the at least two actually measured temperature values, the external disturbance parameters and a preset target temperature, a control quantity is calculated through a compound control algorithm; and S4, according to the control quantity, driving a bidirectional temperature control actuator with heating and active refrigeration capabilities to adjust the temperature of the optical crystal. By constructing a double-point feedback-multi-mode feed-forward-bidirectional execution composite control architecture, the internal thermal gradient of the crystal is sensed in real time by utilizing double-point temperature measurement; various thermal disturbances are accurately counteracted in combination with feedforward compensation of laser power and environment temperature, and an actuator for active heating and rapid semiconductor refrigeration is integrated to realize millisecond-level bidirectional temperature control, so that the crystal steady-state temperature control precision is improved to + / -0.01 DEG C, the temperature stabilization time is remarkably shortened when the laser power suddenly changes, the anti-disturbance capability of the system is enhanced, and the service life of the system is prolonged. The crystal can keep extreme temperature stability for a long time under various working conditions, and finally the performance of the optical crystal and the long-term stability of the output power of a laser are greatly improved.