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Digitale Medien

Signal and noise with a magnetic circular dichroism detection system in optical data storage (1994)

Schlichting, W. ; Milster, T. D. ; Wang, M. S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 2322-2324

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A magneto-optical head with circular polarized light incident on a Co/Pt superlattice medium is studied. Differential absorption due to magnetic-circular-dichroism (MCD) is used for erasable data detection. This MCD detection system utilizes an optical isolator to minimize the feedback to the laser. The tradeoff for its reduced complexity is the loss of the common mode noise reduction capability. A disk is tested dynamically with the MCD detection system. With a linear medium velocity of 7.56 m/s and a frequency of 5 MHz a carrier-to-noise ratio of 40 dB is demonstrated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.356249

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Digitale Medien

Optical data storage based on magnetic circular dichroism (1993)

Schlichting, W. ; Milster, T. D. ; Campillo, C. J.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 62 (1993), S. 2751-2753

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: An alternative to differential detection in optical data storage is magnetic circular dichroism (MCD) detection. The MCD system has increased light efficiency when compared to the commonly used differential detection method. Also, the signal amplitude for MCD detection can be twice as large as for differential detection when an s-p phase difference of 90° is introduced in the medium. Modeling results show that a thin-film device can introduce the necessary s−p phase difference. Our signal-to-noise analysis indicates that the MCD system rejects polarization noise. Experimental results on coupon samples verify that the signal from MCD detection can be twice as large as from differential detection.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.109250

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