Phase-stable sub-cycle mid-infrared conical emission from filamentation in gases.
Opt Express
; 20(22): 24741-7, 2012 Oct 22.
Article
em En
| MEDLINE
| ID: mdl-23187238
ABSTRACT
Sub-single-cycle pulses in the mid-infrared (MIR) region were generated through a conical emission from a laser-induced filament. Fundamental and second-harmonic pulses of 25-fs Tisapphire amplifier output were focused into argon to produce phase-stable broadband MIR pulses in a well-focusable ring-shaped beam. The beam profile and spectrum of the MIR field are accurately reproduced with a simple calculation based on a four-wave mixing process. The ring-shaped pattern of the MIR beam originates from a dramatic confocal-parameter mismatch between the MIR field and the laser beams.
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MEDLINE
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En
Ano de publicação:
2012
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Article