Gradient enhanced third harmonic generation in a femtosecond filament

The third harmonic generated during femtosecond filamentation in air is studied. By establishing a gradient from atmospheric pressure to vacuum conditions, we truncate the filament abruptly at defined positions. The introduction of the pressure gradient leads to an enhancement of the generated third...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Optics letters 2011-11, Vol.36 (22), p.4389-4391
Hauptverfasser:	SCHULZ, Emilia, STEINGRUBE, Daniel S, VOCKERODT, Tobias, BINHAMMER, Thomas, MORGNER, Uwe, KOVACEV, Milutin
Format:	Artikel
Sprache:	eng
Schlagworte:	Exact sciences and technology Frequency conversion harmonic generation, including high-order harmonic generation Fundamental areas of phenomenology (including applications) Nonlinear optics Optics Physics Ultrafast processes optical pulse generation and pulse compression
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The third harmonic generated during femtosecond filamentation in air is studied. By establishing a gradient from atmospheric pressure to vacuum conditions, we truncate the filament abruptly at defined positions. The introduction of the pressure gradient leads to an enhancement of the generated third harmonic radiation by 3 orders of magnitude. This effect is attributed to an improved on-axis phase-matching condition. We investigate the spectral shape and the conversion efficiency of the third harmonic during the propagation in the filament.
ISSN:	0146-9592 1539-4794
DOI:	10.1364/OL.36.004389