コンカレント ROM-RAM 光ディスクに関する一実現方法

抄録

Presently, in magneto optical disk memory field, a lot of efforts are spent for high density recording and its readout. We also have been looking for outstanding features for magneto optical disk memory. As one of new features. CONCURRENT ROM-RAM optical disk memory composed of phase pit information and magneto optical information could be very attractive since the memory capacity is ideally twice as large as a conventional one and both of ROM and RAM are reproduced simultaneously by means of laser feedback method and so called differential detection readout. We have confirmed the feasibility in our basic experiment. However, we also found out the polarization noise generated by the edge of phase pit is quite dominant.