Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Ultrashort laser pulses III

Q 53.1: Talk

Thursday, March 20, 2014, 16:30–16:45, DO26 207

Carrier-envelope phase stability of differentially-pumped hollow-fibres used for few-cycle pulse generation — William Okell¹, Davide Fabris¹, Dane Austin¹, Maiman Bocoum², Aurelien Ricci², Aurelie Jullien², Daniel Walke¹, Jon P. Marangos¹, Rodrigo Lopez-Martens², •Tobias Witting¹, and John W.G. Tisch¹ — ¹Blackett Laboratory, Imperial College London SW7 2AZ, UK — ²Laboratoire d’Optique Appliquée, Ecole Nationale Supérieure de Techniques Avancées-ParisTech, Ecole Polytechnique-CNRS, 91761 Palaiseau Cedex, France

We have examined the energy scaling of a hollow-fibre pulse compression system using a 260µm inner-diameter, 1m long hollow fiber filled with neon. Three common configurations have been investigated: static-fill with linear polarisation (SFLP), differentially-pumped with linear polarisation (DPLP), and static-fill with circular polarisation (SFCP). Using either DPLP or SFCP boosts the maximum output energy from 0.6mJ to 0.8mJ. Ionisation decreases the CEP stability, but this effect is saturated at 1.25mJ by ionisation-induced energy losses inside the fibre. For our experimental parameters, DPLP has similar CEP stability to SFLP. We have generated 0.4mJ, 3.5fs pulses with a CEP stability of 200mrad over >2h using a differentially pumped fibre. Our experimental findings are backed up by a coupled-mode, split-step model, incorporating modal dispersion and loss, the Kerr effect including self-steepening, and ionization.