A compact spark pre-ionized pulser sustainer TE-CO 2 laser that can produce an output energy of one joule with an overall efficiency of 12•4% is presented. Optical pulses have durations of 7•15 µs FWHM. Here, the laser uses all solid-state excitation (ASSE) circuit and the discharge formed between two uniform field electrodes placed 1•5 cm apart ultimately leads to a discharge volume of 50 cm × 1•5 cm × 1•5 cm.