title: Dynamically phase-matched terahertz generation.
abstract: We present the generation of intense terahertz pulses by optical rectification of 780 nm pulses in a large area gallium phosphide crystal. The velocity mismatch between optical and terahertz pulses thereby limits the bandwidth of the terahertz pulses. We show that this limitation can be overcome by a dynamic modification of the refractive index of the gallium phosphide crystal through generation of hot phonons. This is confirmed by excellent agreement between experimental results and model calculations.
authors.affiliation: Photonics Institute, Vienna University of Technology, Vienna, Austria. daniel.dietze@tuwien.ac.at
authors.forename: Daniel
authors.initials: D
authors.lastname: Dietze
authors.forename: Karl
authors.initials: K
authors.lastname: Unterrainer
authors.forename: Juraj
authors.initials: J
authors.lastname: Darmo