A high-field, high power instrument for (nonlinear) Terahertz Emission Spectroscopy

Kurzfassung

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.