Details

Autor(en) / Beteiligte

• Nomura, Yutaka
• Shirai, Hideto
• Ishii, Kenta
• Tsurumachi, Noriaki
• Voronin, Alexander A
• Zheltikov, Aleksei M
• Fuji, Takao

Titel

Phase-stable sub-cycle mid-infrared conical emission from filamentation in gases

Ist Teil von

• Optics express, 2012-10, Vol.20 (22), p.24741-24747

Ort / Verlag

United States

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 Ti:sapphire 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.