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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 23 — Aug. 10, 1999
  • pp: 5058–5065

Optical readout for optical storage with phase jump

Weidong Zhou and Lilong Cai  »View Author Affiliations


Applied Optics, Vol. 38, Issue 23, pp. 5058-5065 (1999)
http://dx.doi.org/10.1364/AO.38.005058


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Abstract

A novel, to our knowledge, optical readout for optical storage with phase jump is presented. In the readout scheme two coherent laser beams are focused on an optical disk with one beam scanning along pits and the other along land. When the probe beam scans across a pit, two phase jumps will take place in the interference resultant of the two beams if the phase difference between two beams is prefixed at π, resulting in a phase pulse of 180 deg. The slopes of rising and falling edges of the phase pulse are infinite, and they are not affected by the intensity variation of the light source, stray light, and the vibration of the disk. Therefore this phase pulse can be used to read out the information on an optical disk. The use of phase jump will improve the signal-to-noise ratio of the readout signal and enhance the density of optical storage. An optical readout with phase jump was constructed. Both the theoretical design and the experimental verification are conducted. Experimental results show that the proposed optical readout is feasible.

© 1999 Optical Society of America

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(210.0210) Optical data storage : Optical data storage
(210.4590) Optical data storage : Optical disks
(230.0250) Optical devices : Optoelectronics
(260.3160) Physical optics : Interference
(260.5430) Physical optics : Polarization

History
Original Manuscript: October 2, 1998
Revised Manuscript: April 29, 1999
Published: August 10, 1999

Citation
Weidong Zhou and Lilong Cai, "Optical readout for optical storage with phase jump," Appl. Opt. 38, 5058-5065 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-23-5058


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