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DYNAMIC LASER POWER AND TEMPERATURE CONTROL EMPLOYING A SINGLE PHOTO-DIODE SENSOR

IP.com Disclosure Number: IPCOM000026597D
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06

Publishing Venue

Xerox Disclosure Journal

Abstract

Combining a laser diode with a holographic scanning system presents a major problem associated with the phenomenon of laser diodes to mode hop due to the diode's inherent frequency instability. This operational occurrence with laser diodes is rooted in the very broad gain characteristic of the device and its tendency to shift frequencies with changes in temperature. As a result, laser diodes, even those laser diodes normally operating as single longitude mode lasers, do shift from one longitudinal mode to another as a result of temperature or power level change.