Abstract:
Un spectromètre hétérodyne spatial comprend un interféromètre (25) dispersif à deux faisceaux ayant en tant que diviseur/combineur de faisceau une grille de diffraction (45). Un faisceau entrant est collimaté et transmis à la grille (45) dans l'interféromètre (25) qui le divise en deux faisceaux (47, 50) qui sont recombinés de sorte que l'angle entre les fronts d'ondes dans le faisceau recombiné à une longueur d'onde particulière est en rapport direct avec la déviation de ladite longueur d'onde par rapport à une longueur d'onde nulle à laquelle les fronts d'ondes sont parallèles. Le faisceau recombiné de sortie est focalisé et mis en image afin de produire des franges de Fizeau sur l'ouverture de sortie (31), ces franges étant enregistrées par un détecteur (34) de formation d'images. La sortie d'intensité variable dans l'espace du détecteur (34) de formation est soumise à une transformation de Fourier de façon à donner une sortie représentative de la fréquence spectrale de l'image en rapport avec la longueur d'onde du faisceau entrant émis par la source.
Abstract:
Method and systems are presented for analyzing a wavefront using a spectral wavefront analyzer to extract optical phase and spectral information at a two dimensional array of sampling points across the wavefront, wherein the relative phase information between the sampling points is maintained. Methods and systems are also presented for measuring an eye by reflecting a wavefront of an eye and measuring the wavefront at a plurality of angles to provide a map of the off-axis relative wavefront curvature and aberration of the eye. The phase accuracy between wavelengths and sample points over a beam aperture offered by these methods and systems have a number of ocular applications including corneal and anterior eye tomography, high resolution retinal imaging, and wavefront analysis as a function of probe beam incident angle for determining myopia progression and for designing and testing lenses for correcting myopia.
Abstract:
A wavefront measurement system includes a source of electromagnetic radiation. An imaging system directs the electromagnetic radiation at an object plane that it uniformly illuminates. A first grating is positioned in the object plane (reticle/source module plane) to condition the radiation entering the input of a projection optic (104). A projection optical system projects an image of the first grating onto the focal plane (wafer plane). A second grating is positioned at the focal plane that receives a diffracted image of the object plane to form a shearing interferometer. A CCD detector receives the image of the pupil of the projection optical system through the projection optical system and the second grating that forms a fringe pattern if there are aberrations in the projection optical system. Phaseshift readout of fringe pattern can be accomplished by stepping the first grating in a lateral direction and reading each frame with the CCD detector.
Abstract:
PROBLEM TO BE SOLVED: To provide a wavelength shift measuring apparatus capable of measuring fluctuation of an optical source wavelength with accuracy and resolution of not greater than pm by being equipped with a construction in which an optical path difference of two light beams stably becomes constant. SOLUTION: A wavelength shift measuring apparatus is a wavelength shift detector WLCD1 which measures a shift of a wavelength of a light beam emitted from a light source, and includes a beam splitter BS2 splitting the light beam emitted from the light source into a plurality of light beams and to synthesize two light beams among the plurality of light beams to generate an interference light, a spacer member SP provided so that an optical path length difference of the two light beams split by the beam splitter PBS2 is constant, and a plurality of photoelectric sensors PDA+, PDB+ detecting the interference light generated by the beam splitter BS2. The plurality of photoelectric sensors PDA+, PDB+ output a plurality of interference signals having phases shifted from one another based on the interference light to measure a wavelength shift using the plurality of interference signals. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
파면 측정 시스템은 전자기파의 소스를 포함한다. 이미징 시스템은 오브젝트 면에 전자기파(electromagnetic radiation: 전자기 복사)를 보내어 균일하게 조명한다. 제1 격자는 오브젝트 면에 위치되어 투영 광학계의 입력으로 입사하는 전자기파를 한정한다. 투영 광학 시스템은 제1 격자의 이미지를 초점면 상에 투영한다. 제2 격자는 오브젝트 면의 회절된 이미지를 수신하는 초점면에 위치되어 층밀림 간섭계를 형성한다. CCD 디텍터는 투영 광학 시스템의 동공의 이미지를, 투영 광학 시스템과, 만일 투영 광학 시스템에 수차가 있다면 프린지 패턴을 형성하는, 제2 격자를 통해 수신한다. 프린지 패턴의 위상 변이 판독은 제1 격자를 측방향으로 스텝핑하고 CCD 디텍터로 각 프레임을 판독함에 의해 달성될 수 있다. 파면 측정 시스템, 격자, 프린지 패턴, 층밀림 간섭계, CCD 디텍터
Abstract:
The present invention relates to a method for simply manufacturing a flexible grating sheet for X-ray phase contrast image without complicated facilities or processes by improving an existing lithography method and by manufacturing the grating sheet in a method of coating a material which can forms a curved surface. [Reference numerals] (AA,BB) Substrate; (CC) Cutting; (DD) Grating sheet; (EE) Enlarging; (FF) X-ray; (S10) Coating/Drying; (S20) Repeating; (S30) Removing the substrate/Cutting/Mirror finishing
Abstract:
PURPOSE: A transmission shear grating in a checkerboard configuration for an EUV(Extreme Ultra Violet) wavefront sensor is provided to measure a quality of wavefront in a photolithography tool during a wafer manufacturing and a light exposure. CONSTITUTION: A wavefront measurement system includes a source of electromagnetic radiation, an irradiation system, a first grating(103), a projection optical system(104), a second grating(201), and a detector(202). The irradiation system uniformly irradiates an electromagnetic radiation on an object plane. The first grating is positioned in the object plane defining the electromagnetic radiation. The projection optical system projects an image of the first grating onto a focal plane. The second grating is positioned at the focal plane. The detector is positioned behind the second grating receiving a fringe pattern generated by the second grating. The second grating is a two-dimensional grating, which is a checkerboard grating in the wavefront measurement system.