Hannover 2020 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Poster
K 4.5: Poster
Dienstag, 10. März 2020, 16:30–18:30, f428
Terahertz radiation in tailored two-color laser fields with nanostructure semiconductor — •Han Rao1,2, Ihar Babushkin1,2, Christian Markus Dietrich1,2, Jose Ricardo Cardoso de Andrade1,2, and Uwe Morgner1,2 — 1Leibniz University Hannover, Institute for Quantum Optics, Hannover, Germany — 2Cluster of Excellence PhoenixD, Hannover, Germany
Terahertz (THz) technology has attracted much attention due to its potential in various applications such as: remote sensing, biology and medicine, security scanning, information and wireless communication technology. THz sources based on two-color ionizing femtosecond (fs) pulses in gases stand out because of absence of damage threshold, absence of phonon absorption and zero interface reflection. Such approach, based on ionization, was up to now not realized in solids. In our case, we use the semiconductor nanodots for THz generation which can be fabricated with tunable band gap. Here, we present a concept of THz pulse generation in semiconductor nanodots with two color pulses, which, as we believe, can generate THz radiation with much higher efficiency than in gases. The two-color driver will be delivered with 40 MHz a doubly resonant optical parametric oscillator (DROPO) which can generate 2060 nm light in the fs region. The DROPO pump source is a home-built Kerr-lens mode-locked Yb:YAG thin disk laser, emitting pulses at a wavelength of 1030 nm with a pulse duration of 250 fs, and 40 W output power and 40 MHz repetition rate.