REFLECTIVE DIFFRACTION GRATING

PROBLEM TO BE SOLVED: To eliminate need of adding a special optical element for the purpose of reducing polarizing characteristic in an optical system using a diffraction optical element, by decreasing polarization dependency of a reflective diffraction grating. SOLUTION: The reflective diffraction...

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Bibliographic Details
Main Authors SEKIGUCHI YUKINARI, HIKICHI NAOKO, NAKAMA KENICHI, SHINMO KATSUHIDE
Format Patent
LanguageEnglish
Published 22.07.2004
Edition7
Subjects
MEASURING
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Summary:PROBLEM TO BE SOLVED: To eliminate need of adding a special optical element for the purpose of reducing polarizing characteristic in an optical system using a diffraction optical element, by decreasing polarization dependency of a reflective diffraction grating. SOLUTION: The reflective diffraction grating is one in which a plurality of parallel linear grooves are formed on the surface of a tabular substrate at regular periods. The protrusions between the grooves are designed to have two alternately different kinds of heights, with the protrusions of each height arrayed with a period in the range of 0.1-10 times average wavelength in a spectral wavelength region. It is desirable that the first height of this inter-groove projections is in the range of 1/5-1/2 of the average wavelength in the spectral wavelength region of the diffraction grating and that the second height is in the range of 1/100-1/10 of the same average wavelength. COPYRIGHT: (C)2004,JPO&NCIPI
Bibliography:Application Number: JP20020375994