Holographic Generation of Contour Map of Diffusely Reflecting Surface by Using Immersion Method

概要

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This paper describes the double exposure holographic formation of a contour map over a diffusely reflecting or transmitting of arbitrary shape and surface finish by using an immersion method with media of different indices of refraction between successive exposure. A wavelength λ effectively contributing to the fringe contour is given by λ_0/Δn where λ_0 is the wavelength of the laser and Δn is the index variation. Index variations were introduced by pressure difference in Freon to give λ=600 μ and 200 μ, and by the combination of two liquids to give 14 μ and 25 μ, thus extending the change of height corresponding to each fringe contour continuously up to one thousand times greater than with the optical Fizeau fringes. A correcting plate of a Schmidt camera in the grinding process was used as a test object and its figuring error were analyzed.
社団法人応用物理学会の論文
1968-08-05