Light wavelength measurement method and light wavelength measurement apparatus
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United States of America Patent
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Dec 19, 2017
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Mar 10, 2014
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Mar 12, 2013
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Abstract
A light wavelength measurement method of measuring a wavelength of target light includes: receiving target light on a second dispersion device that disperses the target light into a plurality of second beams which reach a plurality of positions corresponding to the wavelength of the target light (S106, S202); and measuring the wavelength of the target light, by using the plurality of the second beams as a vernier scale for measuring the wavelength of the target light within a wavelength range specified by a main scale (S108, S204).
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