Abstract

An electro-optical $Q$-switched RF-excited Z-fold ${\mathrm{CO}}_2$ waveguide laser was designed, which can output a $Q$-switched laser and a cavity-dumped laser synchronously. The build-up time method is presented to stabilize the laser frequency. A closed-loop control system was designed to keep the laser oscillating at the peak of the gain curve by measuring the pulse build-up time continuously and controlling the cavity length. In the experiment, the variations for the pulse build-up time and cavity-dumped laser output power with time were recorded in a period of time. The frequency fluctuation is less than $\pm 16\mathrm{MHz}$

© 2013 Optical Society of America

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