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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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A Load-Adaptive Driving Method for a Quasi-Continuous-Wave Laser Diode.

Yajun Wu^1,2,3, Wenqing Liu^1,2, Xinhui Sun^1,2

¹Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

|March 28, 2024

Summary

This study introduces an improved quasi-continuous-wave (QCW) laser diode (LD) driver that automatically adjusts output voltage for stable high efficiency. The new design maintains over 80% efficiency even with varying loads, overcoming traditional limitations.

Keywords:

laser diode driver load-adaptive driving method pulsed constant-current source quasi-continuous wave

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Area of Science:

Electrical Engineering
Laser Technology
Power Electronics

Background:

Quasi-continuous-wave (QCW) laser diode (LD) drivers are crucial for solid-state lasers in applications like laser processing.
Traditional QCW LD drivers often require manual voltage adjustment and struggle with dynamic load changes, leading to inefficiency or failure.

Purpose of the Study:

To design and realize a novel QCW LD driver with enhanced stability and load adaptability.
To overcome the limitations of traditional QCW LD drivers, particularly their inability to automatically adjust output voltage for optimal efficiency under varying loads.

Main Methods:

Developed a QCW LD driver incorporating a stability compensation circuit for a GS20 diode stack.
Implemented a high-efficiency, load-adaptive driving method utilizing MOSFETs operating in the critical saturation region.
Tested the driver with a maximum repetition rate of 100 Hz, 300 A constant current, 10 V load voltage, and 300 μs pulse width.

Main Results:

The designed QCW LD driver demonstrated stable operation and maintained efficiency above 80% across a load current range of 50 A to 300 A.
The load-adaptive method effectively controlled power loss by operating MOSFETs in the critical saturation region.
Achieved maximum output current for the driver with improved efficiency.

Conclusions:

The developed QCW LD driver offers a significant improvement over traditional designs by providing automatic load adaptation and high efficiency.
This technology enhances the reliability and performance of laser processing devices and instruments utilizing QCW diode stacks.