Abstract
The experimental results on unstable ring resonator with 90 degree beam rotation for kilowatts class Chemical Oxygen Iodine Lasers (COIL) are reported. The distribution of near field phase and far field intensity were measured. The beam quality of 1.6 plus or minus 0.2 were achieved while COIL average output power was about 5 kw, and most of these results were compared with that using a conventional unstable resonator.
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