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A laser diode driver is a DC current source designed to provide a forward electrical bias across the P-N junction of a semiconductor laser. This causes the respective holes and electrons from opposite sides of the junction to combine, releasing a photon in the process.TECH-NOTE: Laser Diode Basics & Circuit Design Fundamentals »

Laser diode drivers and current sources are specifically designed to provide stable, transient-free power to semiconductor lasers. To get a better understanding of the basic technical fundamentals and how to design a basic laser driver, please visit our article on driver design basics »