Focus detector as an aid for focusing a laser on a target.
作者信息
Büchl K
出版信息
Appl Opt. 1970 Jan 1;9(1):113-4. doi: 10.1364/AO.9.000113.
PMID:20076147
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 illumiated 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.
摘要
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