Fig. 3: X-ray diffraction.
From: Perspective: an X-ray view of the coherent driving of materials
Time-dependent X-ray diffraction intensities of the (2−23) reflection of a SrTiO3 epitaxial film driven by phase stable THz excitation for various peak electric field strengths. Higher peak field strengths show evidence of additional frequencies caused by phonon upconversion. Reproduced from M. Kozina et al., Nature Phys. 15, 390 (2019)35.
