Abstract

An apparatus is described which assesses the focus of a laser on a surface. An image of the focus is scanned by fiber optics. A rotating slit together with a photodetector behind the fibers detects whether a fiber is illuminated or not. When the focus coincides with the surface of the target, the number of illuminated fibers is a minimum. The apparatus is especially advantageous for adjustment when the radiation is not visible, for example, with neodymium lasers or with frequency doubled radiation from ruby lasers.

© 1970 Optical Society of America

Techniques for Pulsed Laser Holography of People

D. A. Ansley
Appl. Opt. 9(4) 815-821 (1970)

The Effects of Particle Size on Contrast Improvement by Polarization Discrimination for Underwater Targets

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Lasers with Random Stack Mirrors

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