大功率半导体激光器驱动电路

Power driving circuit of Laser Diode

摘要:

为实现30 W连续掺Yb光纤激光器，设计一种大功率(10 A)半导体激光器(LD)的驱动电路，该恒流源电路采用功率场效应管作电流控制元件，运用负反馈原理稳定输出电流，正向电流0 A~10 A连续可调，纹波峰值为10 mV，输出电流的短期稳定度达到1×10-5，具有过流保护、防浪涌冲击的功能。实际应用在30 W连续掺Yb光纤激光器中，结果表明该驱动电路工作安全可靠。

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.