Open AccessDirect measurement of the critical power of femtosecond Ti:sapphire laser pulse in air
Author(s) -
Weiwei Liu,
S. L. Chin
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.005750
Subject(s) - femtosecond , optics , materials science , ti:sapphire laser , laser , femtosecond pulse shaping , sapphire , pulse duration , pulse (music) , self phase modulation , femtosecond pulse , optoelectronics , nonlinear optics , physics , detector
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.
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