Laser-amplified motion detector and method

Details Laser-amplified motion detector and method Laser-amplified motion detector and method

1989-09-29

1991-07-02

Richardson, Robert L.

Dynamic information storage or retrieval

Systems or subsystems combined with diverse art device

369 53, 369121, 372 9, 356 4, 356237, 356376, 356356, G11B 700

Patent

active

050290231

ABSTRACT:
Method and apparatus for measuring nanometer or picometer surface displacements in a target surface. A laser beam is directed against the target surface, and time-dependent variations in laser output power are measured. These variations, which are due to non-specular reflection of the incident beam by the target and reentry of the retroreflected light into the laser cavity, are used to determine time-dependent displacements at the target surface, based on a linear relationship between the measured power variations and surface displacements. The invention is useful for determining microscopic surface features of a surface, for high-density laser optical disc data storage and retrieval, and as an ultrasensitive transducer for sound or mechanical vibrations.

REFERENCES:
patent: 3643015 (1972-02-01), Davidovits et al.
patent: 3901597 (1975-08-01), White
patent: 4011748 (1977-03-01), Bond et al.
patent: 4130360 (1978-12-01), Courtenay
patent: 4760385 (1988-07-01), Jansson et al.
patent: 4902966 (1990-02-01), Brust et al.

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