Abstract

The generation of frequency upshifted, pressure-tunable third-harmonic pulses during ultrafast ionization of subatmospheric noble gases at peak intensity 10<sup>16</sup> W/cm<sup>2</sup> is reported. Pressure tuning of the power spectrum centroid over the range 10<sup>−5</sup> ≲ Δω/ω ≲ 10<sup>−1</sup>, 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

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