A dischargehyphen;excited XeCl excimer laser equipped with unstable resonator optics was injection locked to a lowhyphen;power picosecond pulse train resulting in an efficient highhyphen;power output consisting of a train of sim;150hyphen;ps pulses separated by sim;2 ns and lasting for the duration of the excimer gain. The laser had a total energy of approximately 250 mJ and when focused to an irradiance of sim;5times;1013Wthinsp;cmminus;2on metal targets produced keV x rays with a conversion efficiency of ape;2.5percnt;. thinsp;
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