用飞秒激光(200 fs,1 kHz,800 nm)脉冲在掺杂稀土离子Ce3＋的聚甲基丙烯酸甲酯(PMMA)膜中进行了光存储实验研究,包括对样品的吸收光谱、激光照射前后的电子旋转共振(Electron spin resonance,ESR)光谱的测量和讨论。结果表明掺杂稀土离子Ce3＋的聚甲基丙烯酸甲酯膜具有较低的写入阈值,有利于高速、并行的三维光存储。实验结果采用传统光学显微镜并行读出。给出了四层存储结果(点间距和层间距分别是4 μm和16 μm),并讨论了脉冲能量的大小对空腔尺寸的影响,进行高密度存储时,在保证读出信号灰度值足够大的情况下,应选择尽量小的激光脉冲写入能量。实验结果表明这种材料可以应用于三维光信息存储。

The writing of multi-layered data bits inside a PMMA block doped with rare-earth ions Ce3+ excited by a 800 nm femtosecond (200 fs,1 kHz, 800 nm) pulsed laser, and the measurement and discussion of absorption spectra and electron spin resonance spectra before and after femtosecond laser irradiation are reported. The results indicate that the block has a low writing energy threshold, and it's propitious to high speed and parallel three-dimensional data storage. Experimental results of three-dimensional recording and reading with 4 μm in-plane pit spacing and 16 μm inter-plane spacing in four layers are presented using a conventional microscope. The relation between the size of the microexplosion pit and the laser pulse energy is discussed. For high storage density, smaller pulse energy is preferable while keeping enough grey value. It's proved that this material can be used in three-dimensional data storage.