使用波长800nm、脉冲宽度150fs的近红外激光脉冲紧聚焦到PMMA(聚甲基丙烯酸甲酯)和熔融石英中实现了三维逐位式光数据存储,分别记录下了5、10、15和20层数据位点.利用相位对比光学显微原理对各层数据并行读出,实验分析了各层数据位点的读出对比度的变化.结果表明各层数据位点的折射率对比度由内至外依次增加,记录层数越多,其内部层的对比度下降越明显.由于飞秒激光脉冲与透明介质相互作用中,熔融石英内部产生的残余应力比PMMA内大,因此数据位点参数相同的情况下,利用PMMA材料记录的层数更多. Near-infrared laser pulses with a wavelength of 800 nm and a pulse width of 150 fs were focused on PMMA (polymethylmethacrylate) and fused silica to achieve three-dimensional, bit-by-bit optical data storage, recording 5, 10, 15 and 20 layers Data sites.Using phase contrast optical microscopy to read out the data of each layer in parallel, the changes of readout contrast of data points in each layer were analyzed experimentally.The results showed that the contrast of refractive index of data points in different layers was in turn from the inside to the outside Increase, the more recording layers, the more obvious the decline of the contrast of the inner layer.As the femtosecond laser pulse and the transparent medium interaction, the residual stress generated within the fused silica larger than PMMA, the data site parameters are the same , The use of PMMA material recorded more layers.