Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 109: Ultra-fast phenomena I

HL 109.5: Talk

Friday, April 4, 2014, 10:30–10:45, POT 006

Passively carrier-envelope phase stabilised few-cycle laser pulses in the near-infrared — •Jörg Robin, Jan Vogelsang, Kristina Strahlendorff, Petra Groß, and Christoph Lienau — Institut für Physik, Carl von Ossietzky Universität, Carl-von-Ossietzky-Straße 9-11, 26129 Oldenburg

The acceleration dynamics of strong-field-emitted electrons from sharp metallic nano-tips sensitively depend on the carrier-envelope phase (CEP) of the incident few-cycle laser pulses [1]. Stabilising the CEP [2] thus is a step towards controlling the coherent electron motion on ultrashort time and length scales. Focussing 120-fs pulses centred at 800 nm from a regenerative titanium:sapphire chirped pulse amplification system operating at a repetition rate of 5 kHz into a sapphire crystal generates a white light continuum, which inherits the CEP of the driving pulses. Out of this spectrum both a broadband proportion in the visible and a narrowband proportion in the infrared are parametrically amplified in a non-collinear setup using the second harmonic of the driving pulses as pumping radiation. By recombining the output of these two stages via type II difference frequency generation shot-to-shot CEP fluctuations cancel out and passively CEP-stabilised pulses tunable in a range from 1400 nm to 1800 nm with a pulse duration of 10 fs and a pulse energy of 200 nJ are produced. Here, we demonstrate the CEP stability of our system and show its importance for the electron motion around metallic nanostructures.

[1] Piglosiewicz, B. et al. Nature Photonics (2013). doi:10.1038/nphoton.2013.288

[2] Manzoni, C. et al. Opt. Lett. 29, 2668 (2004)