Development of Intense Terahertz Light Source for Forming Periodic Structures on Material Surface

Abstract

We have developed an intense terahertz wave source aiming at in-situ measurement of periodic surface structures induced by terahertz waves on solid materials with high-spatiotemporal resolution. An intense terahertz wave of 119 µJ was generated from a Lithium Niobate crystal induced with an intense laser with fluence of 25 mJ/cm² by tilted pulse front method. By applying a negative chirp to the laser pulse, the pulse width spread inside the crystal was compensated, and the output of the terahertz wave was maximized.