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<p>to early research on <a href="page.php?w=optical_disc">optical disc</a> systems. During this period he developed a theory together with <a href="page.php?w=Harold_Hopkins_%28physicist%29">Harold Hopkins</a> and Gijs Bouwhuis on the read-out of optical discs through <a href="page.php?w=Diffraction">diffraction of light</a> by the information carrying disc structure. He also contributed to the design of light paths for optical disc systems. At Philips Research Laboratories Braat contributed to <a href="page.php?w=lens">lens</a> and <a href="page.php?w=Systems_design">system design</a></p><p>
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