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Optical Engineering • Open Access

Alignment method for adjusting the center of a sphere to its spin axis
Author(s): Xiao-guo Feng; Lianchun Sun

Paper Abstract

For fabricating the metallic mesh on a spherical substrate, a method that can adjust the center of a sphere to its spin axis is presented. A grating is used for the light splitting and uniting, and fixed on the center of spherical substrate. First, a laser beam is diffracted by the grating and splits several beams, and a ±1-order beam of diffracted beams arrives the substrate and returns to the grating. They are diffracted by the grating again, and an interference pattern is obtained in the overlapped region of two diffracted beams. A polarization prism and a 1/4 wave plate deflect the coherent beam from former incidence direction, and the interference pattern is displayed on a screen by the transform of a CCD detector. While the curvature center of the spherical substrate aligns with its spin axis, the interference pattern is still when the substrate is revolving about its spin axis, or else the interference pattern will alter with the revolving of substrate. The change scale of interference fringes also corresponds with the error of alignment.

Paper Details

Date Published: 1 March 2006
PDF: 3 pages
Opt. Eng. 45(3) 030503 doi: 10.1117/1.2181089
Published in: Optical Engineering Volume 45, Issue 3
Show Author Affiliations
Xiao-guo Feng, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Lianchun Sun, Changchun Institute of Optics, Fine Mechanics and Physics (China)


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