Abstract
The generation of frequency upshifted, pressure-tunable third-harmonic pulses during ultrafast ionization of subatmospheric noble gases at peak intensity 1016 W/cm2 is reported. Pressure tuning of the power spectrum centroid over the range 10−5 ≲ Δω/ω ≲ 10−1, corresponding to a pressure range of 0.1 ≲ p ≲ 700 Torr, is demonstrated. We also demonstrate that the blue-shifted portions of both the 3ω and the ω pulses are preferentially self-guided in a limited pressure range (10 ≲ p ≲ 500 Torr), which is key to separating the pressure-tunable component of the harmonic from nontunable harmonic generated by means of atomic nonlinearities.
© 1996 Optical Society of America
Full Article | PDF ArticleMore Like This
S. Augst, D. D. Meyerhofer, D. Strickland, and S. L. Chin
J. Opt. Soc. Am. B 8(4) 858-867 (1991)
S. P. Le Blanc and R. Sauerbrey
J. Opt. Soc. Am. B 13(1) 72-88 (1996)
M. Ciarrocca, J. P. Marangos, D. D. Burgess, and K. Burnett
J. Opt. Soc. Am. B 13(5) 794-804 (1996)