Abstract
We previously presented the differential phase detection method using a monolithic confocal laser coupler with a confocal knife edge structure (the CKE device), which we call the CKE Pit-Edge method and which is applied to an optical disk system in which the disk has a pit depth of λ/4n. In this paper, the experimental results using this new method are reported. The experimental results agree well with the calculated results. Thus, tracking-error signals, which are very stable in the face of radial lens displacement, can be obtained for an optical disk with any pit depth using the CKE Push-Pull method and the CKE Pit-Edge method.
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References
T. Mizuno, M. Doi, Y. Higuchi, T. Taniguchi, N. Okano, T, Nakao, H. Narui and O. Matsuda: ISOM ‘98, Tech. Dig. (1998) 180.
T. Mizuno, H. Narui and O. Matsuda: Jpn. J. Appl. Phys. 38 (1999) 1994.
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Mizuno, T., Narui, H. A Differential Phase Detection Method for Tracking-Error Signals Using a Monolithic Confocal Laser Coupler. OPT REV 6, 308–313 (1999). https://doi.org/10.1007/s10043-999-0308-9
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DOI: https://doi.org/10.1007/s10043-999-0308-9