Laser diode monitoring apparatus for determining the decay of la

Details Laser diode monitoring apparatus for determining the decay of la Laser diode monitoring apparatus for determining the decay of la

1996-10-08

1998-08-25

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 372 38, G11B 700

Patent

active

057989923

ABSTRACT:
A laser diode monitoring apparatus activates the laser diode in a manner of impulse, measures the sag of light output level, and judges the light emitting performance to be deteriorated if the sag is greater than the reference value. The value of sag comprehends the inequality of light output characteristics of individual laser diodes and the variation of ambient temperature, enabling the accurate decay determination.

REFERENCES:
patent: 4796250 (1989-01-01), Kobayashi et al.
patent: 4855988 (1989-08-01), Shinbayashi et al.
patent: 5040163 (1991-08-01), Sasaki et al.
patent: 5477557 (1995-12-01), Inaba et al.
patent: 5602814 (1997-02-01), Jaquette et al.

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