20 results about "Pulse broadening" patented technology

Apparatus for and method of aligning optical components such as beam splitters in an optical pulse stretcher in which a landing spot of a beam which has traversed a portion of the optical beam splitter and a coincident landing spot of a beam split from a retroreflected input beam are made to align on a target spot. Also disclosed is an apparatus and method for aligning the retroreflector to facilitate proper beam alignment. A fluorescent material may be used to render a beam landing spot visible.

The application provides a method and device for intra-channel and inter-channel nonlinear joint compensation of a WDM system based on an improved LDBP and electronic equipment, and belongs to the technical field of optical fiber communication. The method compensates dispersion by using a linear filter in the time domain, the corresponding network structure is designed as one-dimensional convolution, and the pulse broadening effect is combined in the overlap reservation method, the physical model of nonlinear compensation is improved by considering the interference of intra-channel dispersion pulse broadening and the walk-off effect between channels, and the purpose of intra-channel and inter-channel nonlinear joint compensation is achieved. The application fully utilizes the random interaction between inherent dispersion and nonlinearity in the optical fiber communication system to compensate the phase shift caused by the nonlinear effect, can effectively equalize the nonlinear distortion of the signal under the condition of controlling the calculation complexity and reducing the implementation cost, and is expected to play a better role in the long-distance transmission of the large-capacity WDM system.

A pulse stretcher includes a beam splitter splitting pulse laser light into two beams of pulse laser light, first concave mirrors arranged side by side in a predetermined direction, and second concave mirrors arranged side by side in the predetermined direction as having the same number as the first concave mirrors and facing the first concave mirrors, respectively. One beam of pulse laser light split by the beam splitter travels to one first concave mirror among the first concave mirrors and is reflected alternately by the first concave mirrors and the second concave mirrors 12 times or more as even number times to return to the beam splitter. A number of overlapping of the one beam at each of concentration points where at least part of the one beam of pulse laser light overlaps at beam waists of the one beam is two.

A mid-infrared laser generation system based on dispersion-managed soliton bunch pulses. The system can achieve high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of an all-fiber configuration, a compact structure and a high power proportion in a longer-wavelength region of a mid-infrared spectrum. A pulsed fiber laser device generates a nanosecond pulse laser in a 1.5-micron band. A fiber pulse stretcher is made of a single-mode silica fiber, splits nanosecond pulses into a plurality of ultrafast soliton pulses by means of a nonlinear effect, and performs spectral energy conversion from 1.5 microns to 2.4 microns. A fiber laser amplifier further increases the output power of a stretched pulse laser and extends a spectrum to a 2.7-micron band, and also increases pulse energy beyond a 2.3-micron band. A fiber mode field adapter efficiently couples into a nonlinear fiber pulses generated in the fiber laser amplifier. The nonlinear fiber extends a laser to a mid-infrared 3-5-micron band, thereby achieving high-power, high-efficiency and high-proportion mid-infrared laser output.

The application discloses a LOS state detection circuit for an SFP optical module, which comprises an input inversion module, a signal conditioning and pulse expansion module and a threshold comparison and decision module connected in sequence. The input inversion module comprises a receiving original port link state indication signal, which is used for logical inversion of the original signal and enhancement of driving capacity. The signal conditioning module converts the data pulse stream output by a PHY chip into a smooth direct current voltage by using peak holding and RC expansion technology. The threshold comparison module intelligently judges whether the voltage represents valid signal activity through a hysteresis comparator, and finally outputs a hardware LOS signal which strictly conforms to the SFP MSA standard and is highly stable. The application realizes reliable optical signal loss detection in a full hardware mode, solves the problems of unstable output and easy misjudgment of a traditional scheme, and has the advantages of low cost, small area, fast response and high reliability, and is particularly suitable for integrated SFP optical module design.

This invention discloses a multi-stage cascaded laser frequency doubling device, belonging to the field of laser frequency doubling technology. It includes a front-end frequency doubling module and at least one cascaded frequency doubling module arranged sequentially along the optical path. The cascaded frequency doubling module includes a second-harmonic crystal, a third-harmonic crystal, a beam splitter, a delay adjustment device, and a beam combiner. The front-end frequency doubling module, beam splitter, second-harmonic crystal, beam combiner, and third-harmonic crystal are connected sequentially. By extending the multi-stage continuous cascaded crystal architecture, the long crystal is split into a sequence of thin frequency doubling crystals, suppressing time drift and pulse broadening. Each stage is equipped with a multi-band fully transparent film system to reduce dispersion. Furthermore, a beam splitting and beam combining bypass and dynamic time delay compensation are designed to achieve precise spatiotemporal beam combining of ultraviolet light, enabling femtosecond lasers to possess both high efficiency, low broadening, and excellent pulse quality.

The present application provides a laser device and a manufacturing method of an electronic device, the laser device according to one aspect includes: a discharge excitation type laser oscillator which outputs pulsed laser in an ultraviolet wavelength region; a first optical pulse stretcher which includes a beam splitter and a plurality of concave mirrors, and which expands a pulse width of the pulsed laser; and a relay lens which includes a first lens and a second lens arranged on an optical path of the pulsed laser after the pulse width is expanded, the first lens being a spherical plano-convex lens, and the second lens having a focal length in a long side direction of a beam cross section of the pulsed laser which is shorter than a focal length in a short side direction.

A laser apparatus according to an aspect of the present disclosure includes a laser oscillator configured to emit a pulse laser beam, and a first optical pulse stretcher, a second optical pulse stretcher, and a third optical pulse stretcher that are disposed on an optical path of the pulse laser beam. When L1 represents an optical path length of a delay optical path of the first optical pulse stretcher, L2 represents an optical path length of a delay optical path of the second optical pulse stretcher, L3 represents an optical path length of a delay optical path of the third optical pulse stretcher, and n represents an integer equal to or larger than two, L2 is an integral multiple of L1 by an integer equal to or larger than two and L3 satisfies the following condition: (n−0.75)×L1≤L3≤(n−0.25)×L1.

This invention discloses a detection system and method for cable fault location, relating to the field of cable fault location technology. It acquires nanosecond-level pulse propagation front-end change trajectory data and echo peak width change data to establish a high-frequency attenuation continuous-time distribution map; extracts pulse broadening growth segments and performs front-end compression control to form a compressed pulse front-end shape; rearranges the peak time position to separate low-amplitude reflection signals; tracks its amplitude trajectory and identifies local insulation anomaly segments by comparing with the peak width evolution trajectory; establishes a distance-back mapping and corrects the echo time coordinates to obtain the fault location interval. This invention improves the ability to identify early insulation defects by constructing a continuous-time distribution map and compressing pulse broadening segments, shortening the peak diffusion time, and separating low-amplitude reflection signals within the peak; simultaneously, it improves fault location accuracy and stability by establishing a distance-back mapping relationship and dynamically correcting the echo time coordinates.

The utility model provides a kind of ultrasonic sensor, second matching layer is integrated with piezoelectric ceramic in the accommodating space of first matching layer, form integrated packaging structure, i. e. first matching layer is used as the shell of ultrasonic sensor, also as matching layer, eliminate the acoustic wave reflection interface between the shell of traditional ultrasonic sensor and matching layer, make sound energy transmission efficiency significantly improve;At the same time, the inner wall of accommodating space and second matching layer directly abut, reduce the acoustic impedance mismatch problem between multilayer medium, reduce liquid-sensor interface echo loss, improve the signal-to-noise ratio of flow detection signal;Use 0-3 type composite piezoelectric ceramic, the composite structure of its polymer matrix and piezoelectric ceramic particle can widen sensor operating bandwidth, have lower QM value and faster response rate, eliminate the pulse broadening problem caused by the QM value of traditional PZT piezoelectric ceramic in liquid medium is too high, further improve detection precision.

This invention relates to the field of optical detection technology, specifically providing a coherent anti-Stokes Raman scattering imaging method and apparatus, comprising: splitting an initial light emitted from a driving light source into a driving light and a Stokes beam; processing the driving light into a signal light based on an optical parametric amplifier; performing pulse broadening processing on the signal light in a first optical path, or performing pulse broadening processing on the Stokes beam in a second optical path; combining the signal light and the Stokes beam into a third optical path, and performing pulse broadening processing on the signal light and the Stokes beam in the third optical path to obtain chirped signal light and Stokes beam; and performing coherent anti-Stokes Raman scattering imaging on a target sample based on the chirped signal light and the Stokes beam. This addresses the problem that related technologies cannot simultaneously achieve high-quality and fast hyperspectral imaging.

The application provides a temperature compensation type low-noise optical signal processing and signal shaping optimization method and system, the application utilizes a low-noise PIN balance detector to preliminarily suppress noise of an optical signal to be processed, and obtains a differential voltage signal; a BP neural network is introduced to correct a multi-parameter collaborative temperature compensation model, and a voltage signal compensated according to the corrected compensation model is obtained; then, an adaptive wavelet threshold filtering algorithm is used for deep noise reduction processing, and a noise-reduced optical signal is obtained; and real-time identification of an optical signal distortion type and a distortion degree is performed, and a prism dispersion and a spatial light modulator are used for shaping the distorted optical signal. The application simultaneously compensates for signal amplitude, phase and dark current noise, can accurately offset nonlinear distortion caused by device temperature drift, can simultaneously realize waveform shaping and spectrum shaping, can correct problems such as pulse broadening and waveform distortion, and can suppress spectrum fluctuation and solve multi-stage diffraction crosstalk problems.

A laser apparatus includes a laser oscillator including an optical resonator and a pair of electrodes that apply a voltage to a laser gas to cause discharge, and configured to output a first pulse laser beam, a first optical pulse stretcher configured to output a second pulse laser beam for which a pulse time width of the first pulse laser beam is extended by transmitting a part of the first pulse laser beam, making the other part circulate once, and outputting first transmitted light and first once-circulating light that spatially partially overlap with a first shift amount, and a second optical pulse stretcher configured to output a third pulse laser beam for which a pulse time width of the second pulse laser beam is extended by transmitting a part of the second pulse laser beam, making the other part circulate once, and outputting second transmitted light and second once-circulating light that spatially partially overlap with a second shift amount, which is different from the first shift amount.

An optical pulse stretcher that stretches a pulse width of a pulse laser beam includes a polarizer configured to separate a component in a specific polarization direction of the pulse laser beam that has entered, a delay optical system including a plurality of mirrors through which the pulse laser beam reflected by or transmitted through the polarizer is propagated; and a first Faraday rotator that includes a first magnet and a first Faraday material and is disposed on an optical path of the delay optical system to rotate a polarization direction of the pulse laser beam.

This invention discloses a precision laser selective melting system based on a high-repetition-rate femtosecond laser pulse train. The system includes a substrate forming unit, a displacement system, a powder spreading system, an environmental control system, a control system, a laser system, a scanning system, and a forming chamber. This invention employs passive mode-locking technology with an ultrashort fiber resonator to generate high-repetition-rate pulses. Through pulse broadening, modulation amplification, and recompression, a high-repetition-rate femtosecond laser output is achieved, which is then focused onto the powder surface by the scanning system. The control system is connected to the displacement system, powder spreading system, laser system, and scanning system to control the entire laser selective melting process. The laser selective melting system of this invention uses an ultrafast laser with a repetition rate exceeding 1 GHz and modulated pulses instead of the continuous-wave laser in existing equipment, balancing high heating rate and energy utilization efficiency, thereby improving efficiency while reducing energy consumption.

The application provides an ultra-narrow pulse expansion circuit, method and electronic equipment. The circuit comprises: a calibration module, configured to perform inverse transformation and delay processing on a control signal to obtain a calibration signal; an OR gate, configured to perform logical OR operation on a measured signal and the calibration signal to obtain a clock signal; and a D flip-flop, configured to output an expanded signal according to the control signal and the clock signal. The input end of the D flip-flop is connected to the control signal, and the clock end of the D flip-flop is connected to the output end of the OR gate. The first input end of the OR gate is connected to the output end of the calibration module, and the second input end is connected to the measured signal. The input end of the calibration module is connected to the control signal. By using the application, the measured signal, especially the ultra-narrow pulse with multiple uncertain numbers of ultra-narrow sub-pulses, can be expanded, and the expanded pulse can be stably sampled.

This invention provides a method for manufacturing a gas laser device and electronic components. The gas laser device includes: a cavity device that emits pulsed laser light; and a pulse stretcher comprising multiple annular optical paths for extending the pulse width of the pulsed laser light, the annular optical paths comprising: a beam splitter to which the pulsed laser light is incident; and multiple surrounding mirrors that sequentially reflect portions of the pulsed laser light incident on the beam splitter and return it to the beam splitter in a manner that overlaps with another portion of the pulsed laser light. The pulse stretcher includes a unit that can separate and detach two or more beam splitters from one or more surrounding mirrors.

The present application provides a pulse stretching device, a laser device, an alignment adjustment method, and a method for manufacturing electronic devices, wherein the pulse stretching device according to one aspect includes: a beam splitter that branches a pulsed laser into a loop light and a straight-through light, and overlaps the loop light that has at least circled once in a loop light path with the straight-through light; and a plurality of concave mirrors that constitute the loop light path, wherein the total number of the plurality of concave mirrors is 4n when n is an integer of 1 or more, and wherein a first concave mirror in which the loop light first enters from the beam splitter and a second concave mirror in which the loop light enters from the beam splitter for the third or 4n-1th time are respectively configured to be able to change the angle of the reflecting surface in a state in which the position is fixed.

The application discloses a kind of remote control method and system based on laser radar, method includes: by pre-scanning obtains current dust concentration, obtains the double-pulse emission parameter of different intensity according to dust concentration;Double-pulse is emitted to each scanning direction and echo waveform is collected;According to echo waveform, generate three-dimensional point cloud, extract echo intensity, pulse broadening degree, energy distribution concentration degree and the point correlation in point cloud time domain feature;Based on point cloud spatial distribution and time domain feature, identify suspected obstacle target, calculate intensity proportion deviation, broadening proportion deviation and energy distribution deviation and weighted fusion obtains comprehensive discriminant score, when score exceeds threshold value, combined with spatial geometric consistency verification and time sequence stability verification determine target as multipath artifact or real obstacle;And based on determination result makes corresponding processing.The application can effectively distinguish real obstacle and multipath artifact, improve the reliability and safety of remote control under dust environment.

This invention belongs to the field of laser shaping technology and provides a three-channel parallel ultrafast laser shaping system and method based on spatiotemporal compensation. By setting a pre-dispersion compensation module, this invention introduces controlled negative dispersion in advance, thereby precisely offsetting the pulse broadening induced by digital micromirror array diffraction and thick glass elements in subsequent branches, ensuring that the pulse width of each shaping branch at the focal plane remains in a fidelity state. The beam is distributed to three functionally complementary shaping branches, and a digital virtual focal length is generated by superimposing a specific quadratic phase function. This allows for dynamic compensation of focal position deviations between branches without moving any mechanical components, achieving instantaneous drift-free alignment of multimodal coaxial focal points. This invention not only achieves multi-dimensional flexible customization of the processed morphology but also ensures high consistency of processing thresholds and high fidelity of spatiotemporal pulses during high-speed switching of modes.