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Optical Engineering

Collimation and beam alignment: testing and estimation using liquid-crystal televisions
Author(s): Narasimha S. Prasad; Sean M. Doyle; Michael K. Giles
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Paper Abstract

We report a novel method to test and estimate collimation and beam alignment using a liquid-crystal TV (LCTV). In this technique, a lenslet array pattern generated using a computer program is ‘‘written’’ (transferred) as a video signal to the LCTV using an image-processing system. The image formed by this array at a suitable distance is grabbed using a CCD camera and processed using a centroid-finding algorithm. Experimentally, deviations from collimation and beam alignment as small as 10 µm have been detected. Using a LCTV, it is possible to obtain near-perfect collimation and beam alignment. This technique will be used to achieve initial system collimation and/or alignment and as an aid in automating optical systems that are required to maintain constant collimation and beam alignment.

Paper Details

Date Published: 1 July 1996
PDF: 5 pages
Opt. Eng. 35(7) doi: 10.1117/1.600771
Published in: Optical Engineering Volume 35, Issue 7
Show Author Affiliations
Narasimha S. Prasad, New Mexico State Univ. (United States)
Sean M. Doyle, New Mexico State Univ. (United States)
Michael K. Giles, New Mexico State Univ. (United States)

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