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Dynamic absorption coefficient of water for high-density Er:YAG laser radiation

Transmission experiments of Er:YAG laser light under water were performed by a laser delivery system comprising a hollow fiber and an end sealing cap. The experiments were based on a high energy fluence which produces vapor bubbles in water. Transmission properties of Er:YAG laser light were evaluated with various laser energy and pulse-repetition rates. The results show that, at high laser fluence, the attenuation coefficient of water is very small because water on light axis is fully vaporized.