, Volume 80, Issue 2, pp 221-225

Ultrabroadband continuum generated in air (down to 230 nm) using ultrashort and intense laser pulses

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Abstract

We present results on supercontinuum generation extended up to 230 nm in air during the propagation of a powerful femtosecond laser pulse. The broad supercontinuum generated in air is contributed by self-phase modulation and self-steepening of the fundamental laser pulse, the third-harmonic pulse and their interaction. In particular, the strong interaction between the fundamental and the third-harmonic pulses leads to broad and efficient continuum generation of the third-harmonic pulse itself. The spectrum of the third-harmonic generated in air extends over several tens of nm and overlaps with the shorter wavelength extent of the fundamental continuum.

PACS

42.65.Ky; 42.65.Jx; 52.35.Mw