The paper considers the computation and fabrication of computer-generated phase holograms (CGH) that can produce specific light patterns in the near field of diffraction. It is shown that: 1) near-field elements do not have periodic phase structures and have to be recalculated each time the geometrical parameters and wavelength change; 2) short-focus elements require a lot of calculations because the step of the sampling grid used in computation should be less than the smallest feature of the phase structure. Performance simulation of multifocus CGHs is done both symmetric and asymmetric 1D/2D output intensity distributions. The fabrication technology is described. Comparison between experiment and simulation is made.

Date Published: 4 June 2001
PDF: 9 pages
Proc. SPIE 4296, Practical Holography XV and Holographic Materials VII, (4 June 2001); doi: 10.1117/12.429458

Published in SPIE Proceedings Vol. 4296:
Practical Holography XV and Holographic Materials VII
Stephen A. Benton; Sylvia H. Stevenson; T. John Trout; Sylvia H. Stevenson; T. John Trout, Editor(s)