Synchronous trigger detection for pulse laser readout on super resolution erasable optical disks

The laser pulse readout scheme is advantageous in reading thermal super res olution disks, but the light modulation on the RF signal confuses the detec tion channel. A synchronous trigger detection scheme, using the pulse laser trigger signal to pick up the desired signal, is proposed to suppress the adverse effects of the light modulation. A 5-dB increase of the signal on a n magneto-optical super resolution center aperture detection disk by the sy nchronous detection system was demonstrated experimentally.