Abstract
A gaussian reflectivity resonator of magnification M=5.2 has been used in a high-gain, short-pulse excimer laser. A good optical quality, 20 mm diameter laser beam, of 60 mJ, 18.6 ns long and with a brightness of 2.4x10 13 W cm -2 sr -1 has been obtained. By decreasing the active mode volume cross section, higher optical quality laser beams have been obtained.
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