Method and device for determining the output power of a...

Details Method and device for determining the output power of a... Method and device for determining the output power of a...

2005-02-08

2005-02-08

Leung, Quyen (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S033000

Reexamination Certificate

active

06853657

ABSTRACT:
The invention relates to a method and device for determining the output power of a semiconductor laser diode being operated with a diode current. A defined measuring current, which is less than the threshold current of the semiconductor laser diode, is conducted in a conducting direction through the semiconductor laser diode. The forward voltage drop across the semiconductor laser diode is measured, and the temperature of the laser-active region of the semiconductor laser diode is determined from the measured forward voltage by using at least one calibration curve. The invention makes a simple and precise determination of the output power possible without requiring an additional measuring device, for example, a monitor diode.

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patent: 5736769 (1998-04-01), Nishiura et al.
patent: 6356774 (2002-03-01), Bernstein et al.
patent: 36 03 548 (1986-10-01), None
patent: 195 02 252 (1995-07-01), None
patent: 198 39 088 (2000-03-01), None
patent: 1 039 597 (2000-09-01), None
patent: 2 224 374 (1990-05-01), None

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