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Opt Express. 2005 Jul 25;13(15):5750-5.

Direct measurement of the critical power of femtosecond Ti:sapphire laser pulse in air.

Abstract

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.

PMID:
19498577
[PubMed]
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