用飞秒激光脉冲在PMMA内页面式写入三维光存储的研究

用微透镜阵列聚焦放大的钛宝石飞秒激光脉冲到PMMA内部，在每个微透镜的焦点处造成光学损伤，通过改变焦点的位置，实现了三维数据的写入，用800 μJ 1 kHz重复率的飞秒激光记录速度达到20Mbit/s.阐述了数据信息的调制、写入和读出，分析了微透镜阵列参数对存储密度、数据记录速度和能量阈值的影响，建议了提高存储密度的两种有效途径.关键词：三维光存储微透镜阵列飞秒激光PMMA

Study of three-dimensional storage by parallel writing in PMMA with femtosecond laser pulses

Using a microlens array to focus an amplified femtosecond laser pulse inside a bulk PMMA(polymethyl methacrylate), optical breakdown occurs at each focus of the microlenses. By changing the positions of the foci,we realize the three-dimensional optical recording of high contrast bits at a speed of 20Mbit/s (with a 1kHz fs pulse laser ) in PMMA. Accordingly, modulation and readout of binary data have been presented. The diameter, focus length,and lens aberration in the microlenses are key factors which affect the recording speed and optical capacity based on this mechanism. Two kinds of effective ways to increase the capacity are discussed in this paper.