Aberrant Holographic Focusing Element for Post-Objective Holographic Deflector
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
This article describes a technique for making an aberration-containing holographic lens which, when used with a linear holographic deflector, provides a largely aberration-free, focused deflected beam. The linear holographic deflector to be used during scanning (or a replica) is used in making the aberration-containing holographic lens. A known type of optical scanner includes a rotating holographic disc. A post-objective scanner is one in which the laser beam is focused by a lens before reaching the disc. One disadvantage of conventional post-objective scanners is that the focused beam is distorted or aberrated by the facets of the disc even when the facets are simple plane wave gratings. The type of distortion can be seen in Fig.