Control and calibration of laser systems

Details Control and calibration of laser systems Control and calibration of laser systems

2005-07-26

2005-07-26

Wong, Don (Department: 2821)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S038020, C372S038070

Reexamination Certificate

active

06922421

ABSTRACT:
A method for controlling a laser includes determining an average component of a laser drive current and adjusting a modulation component of the drive current based on the average component and a threshold current signal at the present temperature. Determining the average component includes adjusting the drive current until an output power of the laser is approximately equal to a reference signal that varies according to temperature. The method further includes calibrating the threshold current signal, which includes adjusting the drive current until the laser output power is approximately equal to a second reference signal, and storing the drive current signal as the threshold current signal at the present temperature. The method further includes recalibrating the threshold current signal, which includes storing a difference between a new value and a stored value of the threshold current signal as an offset for other stored values of the threshold current signal.

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