A high rep-rate TEA CO2 laser with two sets of electrodes in the optical cavity is described. Each set of electrodes has an active gain volume of 2.5 cm×2.5 cm×55 cm. The device produces high intensity pulse pairs with varied time separations and varied rep-rates. When the two sets of electrodes discharge synchronously, the device generates an average output power of 1.1 kW with rep-rate 200 Hz. When the two sets of electrodes discharge sequentially, the device generates an average output power of 550 W with rep-rate 400 Hz and maximum pulse-pair interval of 2.5 ms. With the same rep-rate, the average output power from the device decreases with the increase of the pulse-pair time interval. In addition, the pulse-pair profiles with various time intervals are given.