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  • 1
    Electronic Resource
    Electronic Resource
    Signal and noise with a magnetic circular dichroism detection system in optical data storage (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2322-2324 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356249
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical data storage based on magnetic circular dichroism (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2751-2753 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109250
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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