We present a compact confocal readout system for three-dimensional optical memories that uses the thresholding property of a semiconductor laser for feedback light. The system has higher axial resolution than a conventional confocal system with a pinhole. We demonstrate readout results for data recorded in two recording layers with the developed system.
© 2003 Optical Society of America
(140.5960) Lasers and laser optics : Semiconductor lasers
(180.1790) Microscopy : Confocal microscopy
(180.6900) Microscopy : Three-dimensional microscopy
(210.0210) Optical data storage : Optical data storage
Masaharu Nakano and Yoshimasa Kawata, "Compact confocal readout system for three-dimensional memories using a laser-feedback semiconductor laser," Opt. Lett. 28, 1356-1358 (2003)