Bonn 2025 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 5: Laser-Beam Matter Interaction – Light and Radiation Sources II
K 5.4: Vortrag
Dienstag, 11. März 2025, 12:00–12:15, HS XI ITW
Ultra-Narrowband Coherent THz Source for Quantum Control and Advanced Spectroscopy Applications — Peng Han1, Steven. L. Johnson1,2, and •Biaolong Liu1 — 1Pump laser group, laboratory of nonlinear optics, center of photon science, Paul Scherrer Institute — 2Institute of quantum electronics, Department of physics, ETH Zürich
The development of compact terahertz (THz) sources capable of generating high field strengths (>100 kV/cm) with narrow bandwidth (<10%) has become crucial for manipulating functional properties in quantum materials by selectively activating specific low-energy excitations. In fact, many collective modes have linewidths below 100 GHz. Moreover, the spacing between first neighboring modes can be in the same order of the linewidths. Thus, there is a high demand on THz pulses with even narrower bandwidth (<3%). However, this remains challenging, especially within the 3-15 THz range, commonly referred to as the "THz gap". Here, we present a tabletop, ultra-narrowband (<3% bandwidth) THz source, capable of delivering sub-microjoule, carrier-envelope-phase stable, transform-limited transients tunable between 3 and 4 THz, utilizing a chirped-pulse DFG approach. This source will be ideal to create entangling gates in nanostructured semiconductors by optically manipulating the quantum states of Rydberg atoms for quantum information processing. This novel, coherent THz source holds promise not only for quantum device integration but also as a valuable resource for large-scale solid-state research and, potentially, time-resolved studies in chemistry and biology.
Keywords: tabletop THz sources; Difference Frequency Generation (DFG); chirping; spectral bandwidth control; ultra-narrowband