Beam shaping for optical data storage

Edwin P. Walker, Thomas D Milster

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Citations (Scopus)

Abstract

The basic instrument used for optical data storage is a scanning laser microscope. Each device contains a beam from a laser diode that is collimated, shaped and focused with an objective lens to produce a microscopic spot on the recording media. The reflected light is collected by the objective lens and directed to data and servo detectors with a beam splitter. Data density on the storage medium is primarily defined by the size and shape of the focused laser beam used to scan the data. Several interesting techniques have been used to shape the focused spot in a way that decreases the primary feature of the spot, thus increasing density. For example, both amplitude and phase filters have been used to decrease the central lobe, at the expense of increased sidelobe levels. Effects of the sidelobes can be minimized with special electronic circuits. The configuration of the readout optics also can influence density. That is, optical filters can be placed in the collection pupil to improve the system transfer function. When combined with electronic shaping circuits, the optical filters significantly improve device performance. This paper reviews the techniques used for beam shaping in optical data storage with an explanation of each technique and its success or failure.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsF.M. Dickey, S.C. Holswade, D.L. Shealy
Pages73-92
Number of pages20
Volume4443
DOIs
StatePublished - 2001
EventLaser Beam Shaping II - San Diego,CA, United States
Duration: Aug 2 2001Aug 3 2001

Other

OtherLaser Beam Shaping II
CountryUnited States
CitySan Diego,CA
Period8/2/018/3/01

Fingerprint

Optical data storage
Optical filters
data storage
Lenses
sidelobes
optical filters
Networks (circuits)
lenses
Laser beams
Transfer functions
Semiconductor lasers
Optics
Microscopes
beam splitters
pupils
Detectors
Scanning
electronics
lobes
transfer functions

Keywords

  • Beam shaping
  • Electronic filtering
  • Optical data storage
  • Optical filtering
  • Superresolution

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Walker, E. P., & Milster, T. D. (2001). Beam shaping for optical data storage. In F. M. Dickey, S. C. Holswade, & D. L. Shealy (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4443, pp. 73-92) https://doi.org/10.1117/12.446739

Beam shaping for optical data storage. / Walker, Edwin P.; Milster, Thomas D.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / F.M. Dickey; S.C. Holswade; D.L. Shealy. Vol. 4443 2001. p. 73-92.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Walker, EP & Milster, TD 2001, Beam shaping for optical data storage. in FM Dickey, SC Holswade & DL Shealy (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4443, pp. 73-92, Laser Beam Shaping II, San Diego,CA, United States, 8/2/01. https://doi.org/10.1117/12.446739
Walker EP, Milster TD. Beam shaping for optical data storage. In Dickey FM, Holswade SC, Shealy DL, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4443. 2001. p. 73-92 https://doi.org/10.1117/12.446739
Walker, Edwin P. ; Milster, Thomas D. / Beam shaping for optical data storage. Proceedings of SPIE - The International Society for Optical Engineering. editor / F.M. Dickey ; S.C. Holswade ; D.L. Shealy. Vol. 4443 2001. pp. 73-92
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