期刊
OPTICS EXPRESS
卷 13, 期 15, 页码 5750-5755出版社
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.005750
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We report a simple experiment to directly determine the critical power for self-focusing in air by measuring the focal shift of the focused femtosecond Ti:sapphire laser pulses. The measured critical power is 10 GW for the 42 fs laser pulse; it gradually decreases to 5 GW for (chirped) pulse duration longer than 200 fs. (C) 2005 Optical Society of America.
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