环形分区物镜的双光子光存储记录模式的数值模拟

Numerical Simulation of Single-Lens Two-Beam Two-Photon Optical Data Storage Using an Annular-Divided Scheme

为了提高传统的单光束双光子逐点记录模式的层间分辨力,提出一种基于单个环状分区透镜的双光束双光子记录方案;采用计算机数值仿真的实验手段对方案中双光子记录的轴向分布强度进行计算分析.仿真结果表明:通过适当调节两记录光束的功率比例及环形分区透镜的内外环分割比例,可以取得最佳的轴向记录分布.

Optical data storage based on a twophoton process is one among the most promising approaches for realizing highdensity threedimensional data storage. In order to improve the conventional singlebeam twophoton bitbybit writing methods, a novel method viz.that of singlelens, twobeam, twophoton bitbybit writing is proposed. The key point of the method is an annulardivided objective lens used in the laser beam focusing system. In order to illustrate the efficiency of this new method, a series of numerical simulation experiments for calculating the intensity distribution of twophoton recorded signal in longitudinal direction have been carried out. The simulated results showed that, by properly regulating the intensity ratios of the two input lasers, a desirable twophoton recorded signal resolution can be achieved in the longitudinal direction. The new method may be used in highdensity threedimensional optical data storage.