Nonlinear THz spectroscopy and ultrafast materials science
We have a new paper just published in Optics Express. It describes how we generated 144 mW of average THz power in LiNbO3 at 100 kHz. This is part of the THz &D work for LCLS-II. We used a spectrally broadened and recompressed Yb:YAG laser system with <100 fs pulse duration. The challenges here are […]
Here is a short movie showing data from our Nature Physics paper. Here strontium titanate (STO) is excited by a strong single cycle THz pulse and we observe the lattice motion with femtosecond x-ray pulses. You can see how the oxygen atoms (red) follow the THz field more or less linearly while the titanium atoms […]
Or new paper on THz driven dynamics is now out M. E. Kozina et al, Terahertz-driven phonon upconversion in SrTiO3, Nature Physics 15, 387 (2019) Here we excite the soft mode SrTiO3 with an intense THz pulse and probe the structural response of the lattice with hard x-rays at the XPP endstation at LCLS. We […]