14 results about "High harmonic generation" patented technology

The application relates to the fields of material preparation technology and radio frequency devices, in particular to a thin film substrate structure and an acoustic filter. The thin film substrate structure comprises a supporting substrate, an interface layer, an insulating layer and a functional layer; the supporting substrate has opposite first and second surfaces, and the interface layer is located on the second surface; the insulating layer is located on the side surface of the interface layer away from the supporting substrate; the functional layer is located on the side surface of the insulating layer away from the supporting substrate; and the interface layer has at least one of a deep energy level defect and a preset band gap width. The application plays a pinning effect on the Fermi level of the device by the interface layer having at least one of a deep energy level defect and a preset band gap width. The surface local conductance effect of the supporting substrate when working at a high frequency is effectively inhibited, the generation of high-order harmonics is inhibited, and the linearity of the device is optimized.

The invention belongs to the technical field of ultrafast laser, and particularly relates to a higher harmonic generation device and method based on short wavelength, and the device comprises a laser source which is used for generating femtosecond laser pulses; the frequency conversion module is used for converting the femtosecond laser pulse into a short-wavelength driving pulse; the excitation target unit is used for generating higher harmonics by utilizing short-wavelength driving pulses; a cooperative control unit; wherein the working state of the frequency conversion module meets a first resonance condition, and the working state of the excitation target unit meets a second resonance condition; according to the invention, the cooperative control unit dynamically couples the resonance states of the frequency conversion module and the excitation target unit, thereby solving the problem of linkage detuning caused by light wavelength jittering driven by short wavelength and mismatching of system resonance conditions caused by the jittering. Due to the problem, an existing device cannot stably work in an optimal state for a long time, and the stability and the conversion efficiency of higher harmonic output power are restricted.

The invention provides a light field quantum state regulation and control method and device based on solid higher harmonic generation conditions, and relates to the technical field of quantum optics. The laser wavelength of the driving laser and the harmonic order of the solid higher harmonic are controlled according to the control variable strategy, and higher harmonics of different quantum states are obtained; performing quantization conversion processing on higher harmonics of different quantum states to obtain a plurality of Wigner functions used for representing light field quantum state description; and performing function feature analysis on the Wigner function to obtain a light field quantum state regulation and control result including an optical modem state and a coherent state. The invention is used for solving the technical problem that the quantum state of the light field is difficult to directionally regulate and control by using the generation condition of the solid higher harmonic in the prior art.

The invention provides a high-power femtosecond laser peak power multiplying device based on sheet self-compression. The high-power femtosecond laser peak power multiplying device is composed of a high-power femtosecond laser pulse, a thin lens, a fused quartz solid sheet set, a movable sliding rail, a convex reflector, a dielectric film reflector and a self-compression pulse in sequence in the direction of an incident light beam. The characteristic that negative dispersion can be generated due to the fact that femtosecond laser transmits the fifth-order nonlinear effect in quartz glass is utilized to be balanced with the Kerr effect and the positive dispersion of a quartz glass material, and the spectrum is broadened to achieve pulse self-compression under the condition that the quality of light beams is kept during transmission. Peak power multiplication of high-power femtosecond laser pulses can be achieved in a pulse self-compression mode, and the device has the advantages of being simple in structure, convenient to operate, stable, efficient and wide in application range. The device can be applied to the field of high-power femtosecond laser pulse compression and shaping, and can be better applied to application research of laser electron acceleration, higher harmonic generation and the like.

Disclosed is a metrology apparatus and method for measurement of a diffractive structure on a substrate. The metrology apparatus comprises a radiation source operable to provide first radiation for excitation of the diffractive structure such that high harmonic second radiation is generated from said diffractive structure and / or substrate; and a detection arrangement operable to detect said second radiation, at least a portion of which having been diffracted by said diffractive structure.

This invention provides an apparatus for generating an extreme ultraviolet (EUV) Hermit-Gaussian light source, comprising: a femtosecond laser for generating Gaussian-distributed horizontally polarized femtosecond laser pulses; the horizontally polarized femtosecond laser pulses passing through a first half-wave plate and entering a vortex waveplate; the first half-wave plate for precisely adjusting the polarization axis to be parallel to the optical axis of the vortex waveplate, the vortex waveplate for generating a Laguerre-Gaussian beam; the Laguerre-Gaussian beam output from the vortex waveplate entering a polarizer to generate a Hermit-Gaussian distributed femtosecond laser; the Hermit-Gaussian distributed femtosecond laser passing through a second half-wave plate to adjust the laser polarization direction; the Hermit-Gaussian distributed femtosecond laser entering a vacuum cavity and being focused near a high-harmonic generation beam source to generate an EUV Hermit-Gaussian beam; the energy-spatial distribution of the EUV Hermit-Gaussian beam being detected by an EUV photodetector.

The application relates to the field of laser technology and discloses a high-harmonic wave and above-threshold ionization synergic regulation method and system, which adopts a fundamental frequency light and multiple auxiliary fields to form a time-space overlapping composite laser field, adjusts the wavelength, intensity, delay time and polarization direction of the auxiliary field, forms a multi-parameter laser field, takes the multi-parameter laser field as a physical action carrier, synchronously collects HHG spectral intensity distribution and ATI electron spectrum data by using a high-sensitivity spectrometer and an electron spectrometer on the basis of the multi-parameter laser field, inputs the data into a Bayesian optimization algorithm, dynamically adjusts laser parameters, obtains an optimal laser parameter combination, adjusts an electron re-collision probability by adjusting laser ellipticity based on the obtained optimal laser parameter combination, controls an electron ionization time and return energy by using a two-color field carrier envelope phase, synchronously optimizes an HHG cutoff frequency and an ATI spectrum peak position, and realizes closed-loop control; and the application realizes synergic regulation of high-harmonic wave generation and above-threshold ionization processes.

The invention discloses a higher harmonic generation device and an extreme ultraviolet light source system.The higher harmonic generation device comprises a hollow optical fiber and a supporting clamp, the hollow optical fiber is provided with an input end and an output end, the side face of the hollow optical fiber is punched to form at least two air inlet holes, and the at least two air inlet holes are used for independently inputting a gas medium into the hollow optical fiber; the supporting clamp is used for clamping the hollow optical fiber, the supporting clamp is provided with a light inlet hole opposite to the input end, the supporting clamp is provided with an observation window beside the input end, the supporting clamp is provided with at least two air inlet pipelines communicated with the at least two air inlet holes, and the excitation laser is emitted from the light inlet hole to the input end; after being coupled into the hollow optical fiber, coherent superposition is realized under controllable air pressure gradient distribution, so that extreme ultraviolet light is converted and output, at least two air inlet holes are arranged to accurately control the air pressure gradient, long-range phase matching is realized, and an observation window is designed to simplify the laser collimation excitation process and improve the coupling efficiency.

The invention relates to the technical field of laser, and discloses a higher harmonic and threshold ionization coordinated regulation and control method and system, fundamental frequency light and multiple paths of auxiliary fields are adopted to form a space-time overlapped composite laser field, and a multi-parameter laser field is formed by adjusting the wavelength, intensity, delay time and polarization direction of the auxiliary fields. A multi-parameter laser field is used as a physical action carrier; on the basis of a multi-parameter laser field, a high-sensitivity spectrograph and an electron spectrometer are used for synchronously collecting HHG spectral intensity distribution and ATI electron energy spectrum data, the HHG spectral intensity distribution and the ATI electron energy spectrum data are input into a Bayesian optimization algorithm, laser parameters are dynamically adjusted, and an optimal laser parameter combination is obtained; on the basis of the obtained optimal laser parameter combination, the electron re-collision probability is controlled by adjusting laser elliptic skewness, the electron ionization moment and return energy are regulated and controlled by using a two-color field carrier envelope phase, the HHG cut-off frequency and the ATI energy spectrum peak position are synchronously optimized, and closed-loop control is achieved; according to the invention, cooperative regulation and control of higher harmonic generation and threshold ionization process are realized.

The utility model relates to the technical field of higher harmonics, and discloses higher harmonic generation equipment capable of testing the harmonic resistance of a product, which comprises a switching power supply circuit module, an operational amplifier circuit module, a signal generator module, an industrial frequency transformer module and an isolation transformer module, according to the utility model, the anti-harmonic capability of the product can be tested before the product is put into the market, so that the product can still be used safely and reliably in a harsh use environment; a traditional harmonic generator is usually a pure waveform generation circuit, and a waveform with a certain shape and frequency is output through circuit construction. After the circuit is fixed, the generated waveform and frequency are always fixed, however, the utility model has the advantages that the output harmonic waveform is diversified, the output frequency is adjustable, and the maximum bandwidth can reach 100kHZ.

The invention discloses an all-solid-state vacuum ultraviolet light source generation system and method, and belongs to the technical field of ultrafast laser. The system comprises a driving laser module, a solid higher harmonic generation module and a monochromatization module. The driving laser module can generate, regulate and control preceding-stage driving laser and provide various switchable driving light fields. The solid higher harmonic generation module comprises a vacuum cavity, and a rotating motor and a fused quartz target material are arranged in the cavity. And the monochromatization module comprises a reflector of which the two surfaces are plated with vacuum ultraviolet band high-reflection films. Fused quartz is driven by different light fields to generate higher harmonics, and the all-solid-state, high-efficiency and vacuum-load-free high-brightness vacuum ultraviolet band light source is realized.

This invention provides a high-order harmonic generation device based on four-aperture mirrors, comprising: a driving laser module, a first aperture mirror, a second aperture mirror, a first beam collector, a focusing mirror, a gas target, a third aperture mirror, a second beam collector, a fourth aperture mirror, a third beam collector, a metal film, a vacuum cavity, and a vacuum module. The first aperture mirror, the second aperture mirror, the focusing mirror, the gas target, the third aperture mirror, the fourth aperture mirror, and the metal film are disposed within the vacuum cavity. Through the synergistic effect of the four aperture mirrors, ring shaping, two-stage spatial filtering and efficient separation of the driving laser, as well as lossless transmission of high-order harmonics are achieved. This not only successfully attenuates the hundred-watt-level driving laser by more than a thousand times, solving the problem of optical component damage under high power; but also ensures high-throughput output of high-order harmonics while achieving efficient separation. The generated harmonic spectrum has a wide range and a small divergence angle, making it ideal as a light source for time-resolved pump-probe experiments.

The application provides a kind of solid high harmonic generation condition-based optical field quantum state regulation method and device, it is related to quantum optics technical field, method includes: when utilizing driving laser and solid target material interact to generate solid high harmonic, according to control variable strategy control driving laser wavelength and the harmonic order of solid high harmonic, obtain different quantum state high harmonic;Different quantum state high harmonic is quantized conversion processing, obtains multiple wigner function for representing optical field quantum state description;Function feature analysis is carried out to wigner function, and the optical field quantum state regulation result including optical cat state and coherent state is obtained.The application is used to solve the technical problem that solid high harmonic generation condition is difficult to directional regulation optical field quantum state in prior art.

This invention discloses a device for generating topological boundary states and harmonic frequencies based on voltage-controlled lithium niobate. Lithium niobate is arranged in an ordered manner in free space at specific intervals. By applying positive and negative voltages to the left and right sides of the lithium niobate respectively, the refractive index of the lithium niobate material can be changed using electro-optic modulation. Unlike previous studies, the enhancement of nonlinear optical effects is due to the strong local field at the boundary of the topological structure. Furthermore, the topological boundary states generated by this structure are uniformly distributed in an arithmetic progression, meaning that when the fundamental frequency light is in one of the boundary modes, the harmonic light is also in the topological boundary state mode. This makes all generated harmonic light immune to impurities or defects in the structure and prevents backscattering, thus the structure is topologically protected. This nonlinear optical effect based on topologically protected states provides a new approach for generating higher harmonics and other nonlinear optical effects.