Strickler J H, Webb W W
Opt Lett. 1991 Nov 15;16(22):1780-2. doi: 10.1364/ol.16.001780.
What is to our knowledge the first high-density (>10(12) bits/cm(3)) optical recording of digital information in a multilayered, three-dimensional format is reported. Information is written as submicrometer volume elements of increased refractive index in a photopolymer by two-photon excitation of a photoinitiator at the waist of a highly focused beam from a colliding-pulse mode-locked laser. Quadratic dependence of two-photon excitation on intensity confines polymerization to the focal volume. Information is read with sufficient axial resolution by differential interference contrast microscopy. This write-once, read-many technique should increase the capacity of the spinning disk format by 100-fold.
据我们所知，首次报道了以多层三维格式进行的数字信息高密度（>10¹² 比特/厘米³）光学记录。信息通过碰撞脉冲锁模激光器产生的高度聚焦光束腰部的光引发剂的双光子激发，以光聚合物中折射率增加的亚微米体积元素形式写入。双光子激发对强度的二次依赖性将聚合限制在焦体积内。通过微分干涉对比显微镜以足够的轴向分辨率读取信息。这种一次写入、多次读取技术应能使旋转盘格式的容量提高100倍。
