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Carrier-to-noise ratio improvement with pulsed-laser readout on magnetically induced superresolution by center aperture detection disks

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5 Author(s)
Chen, Bing-Mau ; Inst. of Opt.-Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Bor-Wen Yang ; Wein-Kuen Kwang ; Tsung-Eong Shieh
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Magnetically induced superresolution by center aperture detection (MSR-CAD) using pulsed and conventional dc schemes were applied to magneto-optical disks to quantitatively evaluate readout performances. By simulation and experiments, it was found that carrier-to-noise ratio (CNR) in the pulsed-laser readout was about 2.5 dB higher than that in the dc readout scheme at mark size of 0.35 μm or shorter. Therefore, pulsed readout is feasible to improve CNR and recording density in MSR-CAD disks

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )