Share Email Print
cover

Proceedings Paper

Near-UV supercontinua generated in photonic crystal fibers for femtosecond spectroscopy
Author(s): J. Léonard; N. Lecong; J.-P. Likforman; O. Crégut; P. Leproux; V. Couderc; S. Haacke
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We demonstrate the use of broad super-continua generated in photonic crystal fibers (PCFs) for a novel femtosecond absorption pump-probe experiment that records time- and wavelength resolved data. While such experiments relied up to now on amplified sources for the supercontinuum generation, the non-linearities in the microstructured fibers can be induced with a Ti:sapphire oscillator only. We test the performances of such a compact femtosecond spectrometer for the study of molecules in the liquid phase. The aim is to cover the 400-1100 nm spectral range with a single pulse shorter than 200 fs. A commercial Ti:Sapphire oscillator (KM Labs) cavity, delivering 40 fs pulses, has been extended so as to lower the repetition rate (27 MHz) and to increase the pulse energy. Up to 6 nJ are focussed into 8-mm long pieces of commercial (NL-710, Blazephotonics) and home-made PCFs using a microscope objective. The fiber output spectra are measured from 300-1100 nm with a Peltier-cooled CCD (Spec10, Roper Scientific). Most recently, using the fibers produced at XLIM, we have been able to generate a supercontinuum spectrum extending down to 380 nm. While a full characterization of the temporal properties of the home-built fibers is still in progress, we find a single pulse output for the commercial fibers, with negligible chirp for λ= 600-750 nm. Obviously in these short fiber lengths, soliton fission does not take place. With this system the photo-induced dynamics of malachite green have been studied with a noise-floor of 10-4 relative absorption change.

Paper Details

Date Published: 18 April 2006
PDF: 7 pages
Proc. SPIE 6182, Photonic Crystal Materials and Devices III (i.e. V), 61822R (18 April 2006); doi: 10.1117/12.683047
Show Author Affiliations
J. Léonard, Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Univ. Louis Pasteur (France)
N. Lecong, Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Univ. Louis Pasteur (France)
J.-P. Likforman, Institut de Physique et Chimie des Matériaux de Strasbourg (France)
O. Crégut, Institut de Physique et Chimie des Matériaux de Strasbourg (France)
P. Leproux, XLIM Photonics Group (France)
V. Couderc, XLIM Photonics Group (France)
S. Haacke, Institut de Physique et Chimie des Matériaux de Strasbourg (France)


Published in SPIE Proceedings Vol. 6182:
Photonic Crystal Materials and Devices III (i.e. V)
Richard M. De La Rue; Pierre Viktorovitch; Ceferino Lopez; Michele Midrio, Editor(s)

© SPIE. Terms of Use
Back to Top