Figure 3
From: Transient Second Harmonic Generation Induced by Single Cycle THz pulses in Ba0.8Sr0.2TiO3/MgO

THz modulation of second harmonic generation by relativistic inhomogeneity for the case of counter-propagating near-infrared (probe) and THz (pump) pulses. Ω, ω and 2ω are schematically represent THz, infrared optical and optical second harmonic pulses, correspondently.