Proceedings PaperBeam position noise and other fundamental noise processes that affect optical storage
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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.