Journal
OPTICS LETTERS
Volume 32, Issue 22, Pages 3330-3332Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.003330
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Generation of sub-two-cycle, microjoule pulses in the mid-infrared region is demonstrated. Fundamental and second-harmonic pulses of 25 fs Ti:sapphire amplifier output were focused into the air to produce extremely broadband mid-infrared pulses by four-wave difference-frequency generation through the filamentation. The full width at half-maximum of the spectral bandwidth reaches one octave (2.5 - 5.5 mu m), which is sufficiently broad for sub-single-cycle pulse generation. The pulse width was estimated to be 13 fs, without any compressors, by cross-correlation frequency resolved optical gating. The output energy of more than a few microjoule is sufficient for spectroscopy. (c) 2007 Optical Society of America.
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