In the paper,a high-stability laser driving circuit is designed.The hardware of the laser driving circuit mainly includes temperature control module,constant current module and current tuning module.STM32 is used as the main control chip,ADN8443 is used as the temperature control device,combined with the PWM control scheme to achieve temperature control,and the constant current drive circuit and the current tuning circuit are designed to achieve stable output of the semiconductor laser.After testing,the power stability is 0.16%,and the wavelength stability is 0.23 ppm.The circuit has the advantages of tunable,small volume,high efficiency and strong driving ability,which can realize stable control of the laser.
Key words
semiconductor laser /
ADN8834 /
TEC /
constant current drive /
PID
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