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Q: Fachverband Quantenoptik und Photonik
Q 53: Ultrashort Laser Pulses I
Q 53.2: Vortrag
Donnerstag, 26. März 2015, 11:15–11:30, K/HS2
Passively CEP stabilised few-cycle laser pulses in the near-infrared — •Jörg Robin1, Jan Vogelsang1, Christoph Lienau1, and Petra Groß1,2 — 1Carl von Ossietzky Universität, 26129 Oldenburg — 2Universität Osnabrück, 49076 Osnabrück
Understanding fundamental mechanisms on a femtosecond timescale such as charge transfer processes in light harvesting structures [1] or the coherent motion of electrons in the vicinity of metallic nanostructures [2] requires an ultrafast pulsed laser source. Here, we demonstrate a passively carrier-envelope phase (CEP) stabilised source [3] delivering two-cycle laser pulses of up to 220 nJ pulse energy and tunable between 1200-2100 nm [4]. Pulses at up to 5 kHz from a regenerative titanium:sapphire chirped pulse amplifier generate a white light continuum, from which both a broadband spectrum in the visible and a narrowband spectrum in the infrared are parametrically amplified in two non-collinear stages pumped by the second harmonic of the driving pulses. By recombining both stages via difference frequency generation CEP fluctuations cancel to within <800 mrad RMS shot-to-shot and <50 mrad RMS averaged over 100 pulses, both measured over 20 minutes by spectral f-to-2f interferometry. This compares favourably to similar systems [5] and makes our system highly suitable for the experiments mentioned above. [1] Pittalis, S., Delgado, A. et al. Adv. Funct. Mater. (2014), doi:10.1002/adfm.201402316 [2] Piglosiewicz, B. et al. Nat. Photon. 8, 37 (2014) [3] Cerullo, G. et al. Laser Photonics Rev. 5, 323 (2011) [4] Vogelsang, J., Robin J. et al. Opt. Express 22, 25295 (2014) [5] Homann, C. et al. Opt. Lett. 37, 1673 (2012)