1 July 1996 Collimation and beam alignment: testing and estimation using liquid-crystal televisions
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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.
Narasimha S. Prasad, Narasimha S. Prasad, Sean M. Doyle, Sean M. Doyle, Michael K. Giles, Michael K. Giles, } "Collimation and beam alignment: testing and estimation using liquid-crystal televisions," Optical Engineering 35(7), (1 July 1996). https://doi.org/10.1117/1.600771 . Submission:

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