A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Ti:sapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1*10^(12) b/cm3. Some advantages of the employment of SIL have been discussed.
© 2005 Chinese Optics Letters
(140.3390) Lasers and laser optics : Laser materials processing
(210.4770) Optical data storage : Optical recording
(220.3630) Optical design and fabrication : Lenses
(320.2250) Ultrafast optics : Femtosecond phenomena
Fengtao He, Guanghua Cheng, Xiaoqiang Feng, Dongling Zhang, Zhao Cheng, Qing Liu, Wei Zhao, Guofu Chen, and Xun Hou, "Three-dimensional optical data storage using a solid immersion lens to focus a femtosecond laser pulse," Chin. Opt. Lett. 2, 423-425 (2004)