Regensburg 2025 – scientific programme
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DS: Fachverband Dünne Schichten
DS 13: Poster
DS 13.42: Poster
Thursday, March 20, 2025, 18:00–20:00, P1
A high-field, high power instrument for (nonlinear) Terahertz Emission Spectroscopy — •Jonas Woeste1,2, Nikola Stojanovic2, Sergey Pavlov2, Sergey Kovalev3, and Michael Gensch1,2 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany — 2DLR - Institute of Optical Sensor Systems, Berlin, Germany — 3Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
The quest to understand nonlinear terahertz phenomena has driven the development of advanced instruments towards the capability to detect faint terahertz transients with sub-cycle time resolution. The instrument presented here is optimized for a mJ-level laser amplifier operating at kHz repetition rates. It generates high-field THz pulses with peak fields of a few 100 kV/cm spanning frequencies from 0.3-1 THz. Using ultrashort NIR pulses for tilted-pulse-front pumping of a lithium-niobate crystal, pulse energies of up to 5 µJ are achieved. Demonstration experiments include studies on various doped semiconductors, graphene, and chip-integrated Dirac materials giving insights into different nonlinear and non-perturbative quantum phenomena.
Keywords: Graphene; Terahertz; High Harmonic Generation; nonlinear optics