28 April 2016 Reading a CD-ROM without a photodiode
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Abstract
We use a laser diode from a commercial CD/DVD-ROM drive to detect changes in the surface of a diffraction grating without a photodiode. Specifically, we exploit the changing terminal voltage in the laser-diode due to changing feedback strength as the laser is rastered across the grating's surface.
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Michael J. Wishon, G. Mourozeau, K. Ng, A. A. Sahai, Alexandre Locquet, D. S. Citrin, "Reading a CD-ROM without a photodiode", Proc. SPIE 9892, Semiconductor Lasers and Laser Dynamics VII, 98921Z (28 April 2016); doi: 10.1117/12.2227815; https://doi.org/10.1117/12.2227815
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