Feasibility of Femtosecond Laser Writing Multi-Layered Bit Planes in Fused Silica for Three-Dimensional Optical Data Storage

Autor:	Gong Qi-Huang, Luo Le, Wang Dan-Ling, Yang Hong, LI Cheng-De, Xia Zong-Ju
Rok vydání:	2001
Předmět:	3D optical data storage Materials science business.industry General Physics and Astronomy Laser law.invention Optics law Computer data storage Femtosecond business Absorption (electromagnetic radiation) Refractive index Ultrashort pulse laser Bit plane
Zdroj:	Chinese Physics Letters. 18:541-543
ISSN:	1741-3540 0256-307X
DOI:	10.1088/0256-307x/18/4/325
Popis:	The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is demonstrated. The 800 nm, 120 fs Ti:Sapphire laser beam is focused into cubic samples with a 0.65 NA commercial microscope objective. The size of the recorded bits can be smaller than 0.5×0.5×2.5 µm as the laser pulse energy is lower than 300 nJ and the corresponding bit data storage density is 0.2×1012 Tbits/cm3. Due to the aberration produced by the mismatch of the refractive indices between the recording material and its immersion medium, the longitudinal size of the recorded bit increases and the contrast of the bit to the surrounding uninfected zone decreases as the bit plane gets deeper. Hence, a relatively lower storage density of 0.05×1012 Tbits/cm3 is realized.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f2538e0f6c7071ff270606b5042ba0f https://doi.org/10.1088/0256-307x/18/4/325 Zobrazit plný text záznamu