Strong laser action on the 342-nm band of I2 has been obtained by transverse pumping I2/SF6 mixtures at 193 nm with an ArF laser. The highest output energy obtained was 230 mJ at an intrinsic energy conversion efficiency of approximately 30% equivalent to a photon efficiency of greater than 50%.

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A discharge-excited XeCl excimer laser equipped with unstable resonator optics was injection locked to a low-power picosecond pulse train resulting in an efficient high-power output consisting of a train of -150-ps pulses separated by -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 -5 X 1013 W cm -' on metal targets produced keV x rays with a conversion efficiency of ~2.5%.

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