Laser power control with defocusing offset during data recording

Details Laser power control with defocusing offset during data recording Laser power control with defocusing offset during data recording

1992-12-17

1995-01-17

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369107, G11B 700

Patent

active

053831756

ABSTRACT:
A laser control system for use with an erasable optical disk device to minimize laser feedback during a recording operation. Focus control circuits are utilized to establish a slightly defocused condition prior to a recording operation and maintaining that slightly defocused condition throughout the recording operation. Defocusing the write beam significantly reduces feedback and thereby significantly increases pulse-to-pulse repeatability of the write pulse amplitude at the optical disk.

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