Plotting errors measurement of CGH using an improved interferometric method

Abstract

An improved interferometric method is described for measuring plotting errors of desk-top computer plotters used to make computer-generated holograms. The plotting errors are measured using moiré fringes formed using Young’s fringes and straight lines drawn by the plotters. The Young’s fringes are produced by laser beams originating from two single-mode optical fibers. Using this method, plotting errors of Hewlett-Packard 7225A and 7470A plotters are measured.