System for predicting laser end-of life from the power vs. curre

Details System for predicting laser end-of life from the power vs. curre System for predicting laser end-of life from the power vs. curre

1991-09-11

1992-12-15

Berman, Jack I.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

372 46, 324158D, G11B 7125

Patent

active

051723654

ABSTRACT:
Method and apparatus for predicting the approach of semiconductor laser diode end-of-life from the power vs. current characteristic curve of the diode thereby obviating the need for nonvolatile memory. Current measurements are taken for three power levels and the linear slope of the characteristic curve at the high power level is compared to the linear slope at low power levels. When the comparison exceeds predetermined criteria, a flag is raised.

REFERENCES:
patent: 4489477 (1984-12-01), Chik et al.
patent: 4573255 (1986-03-01), Gordon et al.
patent: 4611166 (1986-09-01), Batt

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