4 results about "Full width at half maximum" patented technology

Method for manufacturing a three-dimensional object layer by layer (102), comprising the following steps: Step a) a new layer (105) of grains (201) of a metallic material (109) is applied to a substrate (104), wherein the grains (201) have a mean particle size d50=DM, where the mean particle size is determined as a volume-equivalent sphere diameter, with 50 µm ≥ DM ≥ 1 µm, and a mean layer thickness SD of the newly applied layer (105) is at most 1.5*DM, in particular wherein the new layer (105) of grains (201) is applied to a previously produced layer of grains (200) of the substrate (104); Step b) the topography of the substrate (104) is measured, including the position and shape of the individual grains (201) of the new layer (105); In step c) a lighting plan for the new layer (105) is determined from the topography measured in step b) and the desired shape of the three-dimensional object (102); Step d) according to the illumination plan, at least a part of the new layer (105) of grains (201) is locally illuminated with an electron beam (115), wherein the electron beam (115) has a beam diameter ED on the surface of the substrate (104) with ED≤0.3*DM, where the beam diameter is determined via FWHM (=full width at half maximum); wherein the electron beam (115) selectively illuminates one or more parts (202) of an edge (401) of a respective grain (201), thereby fixing the grain (201) on the substrate (104), in particular on grains (200) of a previously produced layer and / or on other grains (201) of the new layer (105), and wherein the respective illuminated grain (201) remains at a temperature below the melting point of the metallic material (109); wherein the preceding steps a) to d) are repeated several times until the three-dimensional object (102) is complete.

Provided is a wire rod having excellent drawability. In a circular cross section perpendicular to the axial direction of the wire rod, when the average value of the real interlayer spacing at a depth of 0.5 mm from the surface of the wire rod is set as LaveS (nm) and the maximum value of the real interlayer spacing is set as LmaxS (nm), LmaxS / LaveS is 1.70 or less, and in the circular cross section, the average value of the real interlayer spacing at a depth of 0.5 mm from the surface of the wire rod is set as LaveS (nm) and the maximum value of the real interlayer spacing at a depth of 0.5 mm from the surface of the wire rod is set as LmaxS (nm). FWHMc / FWHMs is 1.10-2.00, where FWHMs (nm) is the full width at half maximum of the real interlayer spacing at a depth of 0.5 mm from the surface of the wire rod, and FWHMc (nm) is the full width at half maximum of the real interlayer spacing at the center of the wire rod.

The application discloses a kind of based on TiO2 / SiO2 Composite Cross Structure Dual Polarization Broadband Achromatic Superlens and design method.The superlens includes SiO2 substrate and array arrangement subwavelength composite unit structure.The center of the unit structure is the cross-shaped cylinder of TiO2 material, the four concave corners (i.e. the intersection inner angle area) of the cross-shaped cylinder are filled with SiO2 triangular prism.The longitudinal axis and transverse axis size of the cross-shaped cylinder can be independently valued, global customization is carried out by particle swarm optimization (PSO) algorithm, while releasing maximum parameter freedom degree, excellent orthogonal dual polarization performance consistency is given to the whole lens.The matching error of actual structure and ideal achromatic phase is minimized, and the simulation results show that the superlens realizes stable achromatic focusing in the wide frequency band of 640nm-740nm, the performance is highly consistent in orthogonal polarization state (X polarization and Y polarization), the average focusing efficiency is stable at more than 51%, the maximum focal length relative deviation is only 2.88%, and the full width at half maximum (FWHM) approaches theoretical diffraction limit.The application has wide application prospect in full-color optical imaging, AR / VR micro display and other fields.

The present invention aims to provide a mode conversion device and a design method thereof, which can design arbitrary coupling efficiency and full width at half maximum. The present invention is a mode conversion device having a long-period grating in a core of an optical fiber capable of propagating light in at least two propagation modes, characterized in that the long-period grating satisfies a relationship of mathematical formula C1. Wherein, the full width at half maximum FWHM is a wavelength band in which the coupling efficiency is half compared to the coupling efficiency of the mode conversion of the center wavelength, C is the coupling efficiency, L c is the full coupling length, L g is the grating length, Λ is the grating pitch, and Δβ is the difference in propagation constant of the two propagation modes of the center wavelength as a target of mode conversion; [Mathematical formula C1]