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 suecessive diffraction by an opaque disk followed by a small circular aperture. Cop. 2010 Optical Society of America.
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Alexander Podzorov, Antoine Wojdyla, Guilhem Gallot. Beam waist measurement for terahertz time-domain spectroscopy experiments. Optics Letters, Optical Society of America, 2010, 35 (7), pp.901. ⟨10.1364/OL.35.000901⟩. ⟨hal-00804604⟩

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