Beam waist measurement for terahertz time-domain spectroscopy experiments.
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.
Podzorov
Alexander
A
Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
Wojdyla
Antoine
A
Gallot
Guilhem
G
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*