1 October 1995 Depth-discrimination-based focus error detection scheme for optical storage applications
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Abstract
A novel, differential focus error detection scheme for use in optical recording applications is described. The technique is based on the depth-discrimination property of confocal optical systems. A simple theoretical treatment is used to predict the form of the focus error signal, which is also investigated experimentally using a scanning optical microscope. The focus error response is found to exhibit a more than adequate lock-on range and gain, and is expected to be less sensitive to tracking feedthrough and other forms of cross-talk.
Christopher David Wright, Jing Zhao, Nicholas A.E. Heyes, Warwick W. Clegg, "Depth-discrimination-based focus error detection scheme for optical storage applications," Optical Engineering 34(10), (1 October 1995). https://doi.org/10.1117/12.210753
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