公开(公告)号：US5297076A

公开(公告)日：1994-03-22

申请号：US902621

申请日：1992-06-23

申请人： Carl M. Jefferson ,  Alfred J. Meixner

发明人： Carl M. Jefferson ,  Alfred J. Meixner

IPC分类号： G11C13/04

CPC分类号： G11C13/04

摘要： Phase modulation is used to record data in a spectral hole burning material. A laser and a phase modulator are used to generate both a reference pulse and a phase modulated data pulse to the material. The data is recorded as spectral holes in the absorption spectrum of the material. In order to read the data, a second reference pulse is generated which creates an echo pulse from the material. This echo pulse is combined with a frequency shifted comparator pulse in order to generate a heterodyne signal. A phase sensitive demodulator detects the phase transitions in the heterodyne signal and generates a digital signal representative of the data recorded.

摘要翻译： 相位调制用于在光谱孔燃烧材料中记录数据。 使用激光器和相位调制器来产生对材料的参考脉冲和相位调制数据脉冲。 数据被记录为材料的吸收光谱中的光谱孔。 为了读取数据，产生第二个参考脉冲，从而产生来自材料的回波脉冲。 该回波脉冲与频移比较器脉冲组合以产生外差信号。 相位敏感解调器检测外差信号中的相位变化，并产生代表所记录数据的数字信号。