Abstract
A Nd:YAG crystal sample was irradiated by 200 pulses of ArF excimer laser at 35mJ/cm^2 laser fluence and 1Hz repetition rate. The optical absorption of the Nd:YAG crystal was decreased in the whole spectral range of the ultraviolet visible near-infrared region after ArF laser irradiation and some oxygen vacancies of the Nd:YAG crystal were removed according to its additional absorption spectrum. A laser-induced damage threshold (LIDT) measurement of the ArF laser treated crystal was performed by linearly polarized 30ns, 1064nm single longitudinal mode, TEM00 laser pulses. The LIDT of the ArF-laser-irradiated crystal was found to be 302±35 J/cm^2, about three times higher than the LIDT of the unirradiated crystal. Thus, the laser-treated Nd:YAG crystal is preferred to apply as the laser amplifier medium, due to the possibility of further laser amplification caused by the higher damage threshold of the amplifier medium.
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