Power driving circuit of Laser Diode

Abstract:

This paper introduces a power driving circuit for Laser Diode(LD). It adopts power Metal- Oxide Semiconductor Field Effect Transistor(MOSFET) as adjust device，and apply current negative feedback to ensure constant current output. The output current is a forward current adjustable in 0 A–10 A range with ripple less than 10 mV，whose short-term stability has reached 1×10-5. This circuit also bears functions including maximum current，surge current limitation and slow start. It has been applied as pump source for a Yb doped optic fiber laser，and the experimental results has proved its reliability and safety.