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Proceedings Paper

Speckle-free laser probe beam
Author(s): Ming Lai
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Paper Abstract

A speckle free laser probe beam is desirable for applications where a laser probe beam is preferred but laser speckles are troublesome. For example, it is an ideal replacement of laser or SLD probe beam for ophthalmic wavefront instrument that employs a Hartmann-Shack wavefront sensor. The speckle free laser probe beam employs a rotating disk of holographic phase plate in a laser probe beam path to modify the relative phase across the beam and to randomize the modified relative phase rapidly in a time sequence. The holographic phase plate is designed to produce a small but well-defined diffused angle such that the beam quality of the modified probe beam can remain close to diffraction limit. Our experiment shows that spot image with such a modified laser pobe beam is substantially free of speckles. Design considerations and parameters, as well as potential applications, of the speckle free laser probe beam are presented.

Paper Details

Date Published: 3 July 2003
PDF: 6 pages
Proc. SPIE 4996, Light-Emitting Diodes: Research, Manufacturing, and Applications VII, (3 July 2003); doi: 10.1117/12.475723
Show Author Affiliations
Ming Lai, MD Lasers & Instruments, Inc. (United States)

Published in SPIE Proceedings Vol. 4996:
Light-Emitting Diodes: Research, Manufacturing, and Applications VII
E. Fred Schubert; Kurt J. Linden; H. Walter Yao; Daniel J. McGraw, Editor(s)

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