Short coherent-length optical tomograph for high density volume

Details Short coherent-length optical tomograph for high density volume Short coherent-length optical tomograph for high density volume

1997-09-02

1999-03-16

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 94, 369112, 3692752, G11B 700

Patent

active

058838759

ABSTRACT:
A device for reading data from a multi-layered optical disk includes a short coherence-length light source, a beam splitter, an adjustable mirror and an optical detector. The beam splitter is used to form first and second light beams from the short coherence-length light beam. The first light beam is then directed to the optical disk and is reflected by a data mark stored on the optical disk. The second light beam is directed along a reference beam path. The mirror is disposed along the reference beam path and reflects the second light beam back to the beam splitter. The beam splitter recombines the reflected first light beam and the second light beam after the second light beam traverses the reference beam path. The optical detector detects the data mark by constructive interference of the combined reflected first light beam and the second light beam. The position of the mirror is adjustable so that the optical path length of the reference beam path is made equal to the optical path length of the first light beam to each layer of the multi-layered optical disk. A device for recording data onto a multi-layered optical disk uses similar components and techniques for recording data.

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T.L. Wong et al., PHOEbE, a prototype scanning laser-feedback microscope for imaging biological cells in aqueous media, Journal of Microscopy, vol. 177, Pt 2, pp. 162-170, Feb. 1995.
A. Bearden et al., Imaging and vibrational analysis with laser-feedback interferometry, Optics Letters, vol. 18 No. 3, pp. 238-240, Feb. 1, 1993.
L. Wang et al., Kerr-Fourier imaging of hidden objects in thick turbid media, Optics Letters, vol. 18, No. 3, pp. 241-243, Feb. 1, 1993.

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