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A: Fachverband Atomphysik

A 22: Poster: Interaction with strong or short laser pulses

A 22.11: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

Structure of XUV frequency combs generated by trains of few-cycle pulses — •Maria Tudorovskaya and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany

The spectrum of a high-repetition train of laser pulses consists of many equally spaced lines, known as an optical frequency comb and useful in high-precision spectroscopy. By exposing atoms to a strong pulse train, it is possible to produce an XUV frequency comb by means of high-harmonic generation. In these experiments, the driving laser field does not usually have zero offset frequency, leading to order-dependent harmonic offset frequencies. We study theoretically the generation of XUV frequency combs by trains of few-cycle pulses, which generate overlapping harmonics. The structure of such combs and in particular the spacing between the "teeth" is investigated.