INJECTION LOCKING OF A MODIFIED-UNSTABLE-RESONATOR XECL LASER BY USING A LINE-NARROWED HEMICONFOCAL OSCILLATOR

An injection-locked XeCl excimer laser with a modified positive-branch confocal unstable resonator was developed and the output characterist ics were investigated. We utilized the hemieonfocal scheme in the line -narrowed oscillator in order to obtain a seed beam with high energy a s well as narrow linewidth. In this case we obtained 0.05 cm(-1) linew idth with 10 mu J output energy. The maximum output energy of the inje ction-locked oscillator was 110 mJ, which is 15% greater than that wit h free-running oscillation. We also presented a new method which can s imply measure the power gain of the amplifier, by which the small sign al gain coefficient of the amplifier was measured to be 10%/cm.