12 results about "Angular dispersion" patented technology

The invention relates to the technical field of digital-to-analog conversion, in particular to a large-dispersion compact chirped pulse time domain compression method, which comprises the following steps of: projecting a broadened chirped pulse to a first grating in an inclined incidence mode, and moving adjacent back and forth diffraction spots point by point in a direction parallel to a grating scribed line; the first grating and the second grating are oppositely arranged in parallel to form a double-grating group; controlling the chirped pulse to perform multiple back-and-forth diffraction between the first grating and the second grating to obtain a preset large dispersion amount; an angular dispersion steering module is arranged on a back-and-forth diffraction light path of the chirped pulse, and vertical angular dispersion introduced due to oblique incidence is turned into horizontal angular dispersion. An angular dispersion compensation module is arranged on a light path before the chirped pulse is output, and the angular dispersion accumulated by multiple back-and-forth diffraction is offset and compensated. According to the method, on one hand, the dispersion amount several times that of a traditional pulse time domain compressor can be obtained, on the other hand, the compact design of the structure of the compressor can be achieved, and the method has important engineering application value.

A sample observation device (1) comprising: a light source (10); an objective lens (13); a multimode optical fiber (15); an optical dispersion element (18) configured to allow angular dispersion of the light transmitted by the objective lens as a function of wavelength; an image sensor (19) configured to form an image of the light dispersed by the optical dispersion element; and a processing unit (30) configured to accumulate the intensity detected on pixels along each isofreference line, so as to obtain a frequency spectrum, taking into account the curved shape of each isofreference line. Figure 6A.

This invention discloses a narrowband polarization metasurface for suppressing long-wave infrared angular dispersion and its fabrication method, relating to the field of optical component technology. Addressing the problems of difficult fabrication and strong angular dispersion inherent in existing polarizers, the metasurface of this invention comprises a barium fluoride substrate and a double-layer composite grating structure disposed on its surface. The composite grating includes a bottom arsenic selenide grating and a top metal layer. By limiting the period of the composite grating to 5.5-6.25 micrometers and the width of a single double-layer grating structure to 4.5-5.5 micrometers, the downward-leaking guided modes and Fabry-Perot cavity modes within the structure undergo strong compression in momentum space, resulting in band folding and anti-crossing flat-band effects. This invention not only relaxes the feature size to the micrometer level, significantly reducing fabrication difficulty, but also fundamentally suppresses the strong angular dispersion of plasmon resonance in narrowband, achieving a high polarization extinction ratio under large angle tolerance and greatly reducing the collimation requirements of practical optical paths.

This invention discloses a high-precision track reconstruction method for GeV-level proton beam telescopes, comprising: setting a high-current mode to collect hit clusters of multi-particle events within a single time window; employing a layer-by-layer state prediction intelligent search algorithm based on a multiple Coulomb scattering model, starting from the first detector layer, combining initial angular dispersion and material scattering to calculate the total angular dispersion standard deviation, and determining circular candidate search regions layer by layer; performing track connection, branching, or pruning based on cluster matching within the region; updating the track direction using the connection direction of matched clusters, and superimposing the scattering angle standard deviation of the next layer of material, iteratively predicting subsequent search regions until all detector layers are traversed, outputting a high-quality candidate track set. This invention can achieve stable and efficient track reconstruction under the conditions of GeV-level proton beams with significant scattering and accumulation, providing a reliable data foundation for high-precision detector calibration.

This wavelength-coupled laser device includes n angle-dispersive wavelength coupling optical systems (11), n or more beam expansion optical systems (12), and (n-1) beam splitter type wavelength coupling optical systems (13), wherein: the angle-dispersive wavelength coupling optical systems (11) include a plurality of laser light sources (111) that output laser beams having mutually different wavelengths, and an angle-dispersive wavelength coupling optical element that outputs one wavelength-coupled beam having the wavelengths of each of the laser beams output by the plurality of laser light sources (111); the power density of the wavelength-coupled beams output by the angle-dispersive wavelength coupling optical systems (11) is the same as the power density of the wavelength-coupled beams finally obtained by the (n-1) beam splitter type wavelength coupling optical systems (13); and one wavelength-coupled beam having the wavelengths of the wavelength-coupled beams output by the n angle-dispersive wavelength coupling optical systems (11) is finally obtained by means of the (n-1) beam splitter type wavelength coupling optical systems (13).

[Problem] To miniaturize an optical device. In particular, provided is a miniaturized grism which is a high-performance grism that achieves higher angular dispersion (wavelength resolution) under the condition of retaining the same size and refractive index, or having a smaller refractive index. [Solution] A grism is provided with: a prism and a prism array, or two prism arrays; and a transmission-type grating arranged between the prism and the prism array or between the two prism arrays.

The invention discloses a method for realizing a dual-polarization broadband Laplacian differentiator based on a non-local metasurface, and belongs to the application fields of nano photonics, optical calculation and optical field information regulation and control. The non-local metasurface works in a transmission mode and is composed of a square ring unit array made of a single-layer amorphous silicon material. By designing and selecting geometric parameters of the square ring, the non-local metasurface respectively excites bound state modes with different angle dispersion capabilities in a quasi-continuous domain under irradiation of p polarized light and s polarized light, and an optical transfer function required by optical Laplacian differential operation can be realized in a real airspace. And generating a processing file of the corresponding non-local metasurface according to the determined geometric dimension of the square ring unit. And processing the transmission-type non-local metasurface by adopting a micro-nano processing technology of electron beam etching. In a working wave band, when a target image directly enters the non-local metasurface under irradiation of p polarized light and s polarized light, two-dimensional second-order edge contour information of the target image can be directly obtained under the dual-polarization channel.

The disclosure relates to an imaging method and an imaging system for carrying out this method. The disclosure provides an improved multispectral ptychographic imaging method and a corresponding system. For this, the imaging method of the disclosure comprises the following steps: Generation of at least partially coherent electromagnetic radiation (3) which contains spectral components at at least two different wavelengths; spatial separation of the spectral components of the electromagnetic radiation, for example by angular dispersion; generation of structured illumination beams (9) by selecting respectively one of the spectral components by means of a structured aperture (8a, 8b, 8c); moving an object (6) in a direction transverse to the path of the illumination beams (9) into a plurality of positions; detecting an intensity pattern for each of the positions, wherein the intensity patterns are generated by scattering and / or diffraction of the illumination beams (9) at the object (6) in a detection plane; and reconstructing an image of the object (6) from the detected intensity patterns, wherein for each of the at least two wavelengths an image of the object (6) is calculated by means of a ptychographic reconstruction algorithm.

The invention discloses a high-flux three-dimensional super-resolution two-photon laser direct writing system and method, and the system can enable femtosecond laser to be full of pupil at an entrance pupil position of an objective lens by controlling the angular dispersion generated by the reflection of the femtosecond laser after passing through a digital micromirror array and the focal length of a third lens. Therefore, high-flux three-dimensional super-resolution two-photon laser direct writing is realized, the pulse width of the femtosecond laser does not need to be specially regulated and controlled, and the requirement on the femtosecond laser is low, so that the two-photon laser direct writing system provided by the invention can realize low-cost and high-flux super-resolution three-dimensional micro-nano processing.

The invention discloses a laser light path control method and system for micropore machining, and belongs to the technical field of laser precision machining, and the method comprises the steps: obtaining surface light feedback data of a to-be-machined area, judging the surface integrity based on the surface light feedback data, and generating a machining permission instruction when the judgment is passed; in response to the processing permission instruction, negative spatial angular dispersion distribution is preset for a laser beam to counteract positive dispersion distortion generated by subsequent scanning deflection, so that a to-be-processed light field of which the wavefront is subjected to space-time calibration is constructed; executing spiral scanning by using a to-be-processed light field, modulating pulse frequency based on real-time scanning linear velocity, and generating a cut-off signal when entering a track center singular region; plasma radiation characteristics in the scanning process are monitored, and an instruction for switching to a concentric ring pumping track from spiral scanning is generated when slag discharging blockage is recognized. According to the method, the plasma radiation characteristics in the scanning process are monitored, so that the process stability and the yield of deep hole machining are improved.

A wavelength selective switch includes a waveguide array for providing an input light beam, a polarizing collimator for splitting the input light beam into polarized collimated first and second sub-beams propagating along non-overlapping optical paths, and a dispersive element for angularly dispersing the first and second sub-beams into wavelength components. First and second angle-to-offset elements are provided for focusing the wavelength components of the first and second sub-beams. A first deflector array and a second, different deflector array are disposed at focal planes of the first and second angle-to-offset elements respectively for redirecting the wavelength components to propagate back through the optical train for in-coupling into a waveguide of the waveguide array. Such a configuration of the wavelength selective switch allows the use of inexpensive standard deflector arrays.