Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading (phase-contrast) and a serial reading (confocal-type) methods. The method for modulating laser pulses can also be used in all of pulsed laser systems which operate in cavity-dumping configuration.
© 2005 Chinese Optics Letters
Qing Liu, Guanghua Cheng, Yishan Wang, Zhao Cheng, Wei Zhao, and Guofu Chen, "Three-dimensional optical storage in fused silica using modulated femtosecond pulses," Chin. Opt. Lett. 2, 292-294 (2004)