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1 March 1991Beam position noise and other fundamental noise processes that affect optical storage
The semiconductor diode lasers that are used for optical data storage are known to show large intensity noise. One means of rejecting such noise is to use a differential split detector to read stored data as well as to follow servo tracks etc. Such a strategy is subject to beam position noise a hitherto obscure effect which cannot always be neglected. This paper will discuss the management of diode laser noise which -under ideal conditions - can actually be pushed below the shot noise limit.
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David Levenson, "Beam position noise and other fundamental noise processes that affect optical storage," Proc. SPIE 1376, Laser Noise, (1 March 1991); https://doi.org/10.1117/12.25004