The Study Of Wavelength Locked And Driven Technology On Tunable Diode Laser

The Center wavelength changing of laser when detecting gas with TDLAS method, will lead to great deviation or even disappearance on the final measurement results. In this paper, after analyzing how the laser works in testing system, it was clear that working temperature and current stability of laser were keys for its emission wavelength. The current driven and temperature controlled modules of laser had been researched, after using constant current source driven and PID temperature controlled, it was realized that the laser driver current driven accuracy less than 2%, and temperature controlled accuracy less than 0.2℃. And after measuring the emission wavelength of laser, the conclusion was verified.