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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4μm和16μm),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 optical storage experiments were carried out in a PMMA film doped with rare earth ion Ce3 + by using pulses of femtosecond laser (200 fs, 1 kHz, 800 nm), including the absorption spectra of the samples, Electron spin resonance (ESR) spectra were measured and discussed. The results show that poly (methyl methacrylate) doped with rare earth ion Ce3 + has lower write threshold, which is good for high speed and parallel three - dimensional optical storage. The experimental results were read in parallel with a conventional optical microscope. The results of four-layer storage are given (the dot spacing and interlayer spacing are 4μm and 16μm, respectively). The influence of the pulse energy on the size of the cavity is discussed. When high-density storage is performed, The case should be selected as small as possible to write the laser pulse energy. Experimental results show that this material can be applied to three-dimensional optical information storage.