An electrooptically cavity dumped and Q switched RF waveguide CO 2 laser is reported. The cavity dumped and Q switched pulse laser output can be simultaneously obtained. The peak powers can be controlled by adjusting the voltage on the electro optical crystal. The pulse interruption can be changed by adjusting the pulse width of the voltage on the electro optical crystal. In this way programmable laser output can be achieved. In addition, a theoretical analysis is made on the cavity dumped process.