title: Beam waist measurement for terahertz time-domain spectroscopy experiments.
abstract: Classical masking aperture methods are found to be mostly inaccurate to determine the terahertz beam size in terahertz time-domain spectroscopy (TDS) experiments, owing to complex diffraction effects. Here, we present a simple and reliable method for measuring beam waists in terahertz TDS. It is based on the successive diffraction by an opaque disk followed by a small circular aperture.
authors.affiliation: Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
authors.forename: Alexander
authors.initials: A
authors.lastname: Podzorov
authors.forename: Antoine
authors.initials: A
authors.lastname: Wojdyla
authors.forename: Guilhem
authors.initials: G
authors.lastname: Gallot
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D010783:Photometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055069:Terahertz Imaging; D055068:Terahertz Spectroscopy / Q000295:instrumentation*