The Design Of High Power Laser Diode Driver

In recent years, with the rapid development of high power laser diodetechnology, the high power laser diode is widely used in material processing, laserlight, laser medical care and other civil fields, and laser guidance, laser nightvision, laser weapon in the military. This will not only promote the developmentof high power laser diode drive technology, but also make the drive technologythe core in each application field of high power laser diode.For the requirement of high power laser diodes, this article designed the highpower laser diode driver, integrating analog circuit technology, digital controltechnology and programming technology. According to the constant currentworking characteristics of laser diode, the constant current circuit has beendesigned using current negative feedback method, which realizes the stablecurrent output; According to the temperature characteristics of laser diode, thetemperature protection circuit has been designed using temperature sensor ofnegative temperature coefficient; According to the damage mechanism of laserdiode, the over-current and over-voltage protection circuit has been designed, andalso take the esd protection and reverse voltage protection measures. Using singlechip microcomputer control technology, realizes the automation control of highpower laser diode driver.By test, the technical index of high power laser diode driver for: The outputcurrent for0~26A; Current stability better than the0.31‰; CW and QCWworking modes; In QCW working mode, working frequency for500~5000Hz,duty cycle for0~100%. The last will the driver used in laser diode pumped fiberlaser, long time running shows a good working performance.