Terahertz wavefronts measured using the Hartmann sensor principle

Journal article (2012)
Department
QN/Quantum Nanoscience (AS) (TU Delft)
Copyright: © 2012 Optical Society of America
DOI: https://doi.org/doi:10.1364/OE.20.014380
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Published Date

13-06-2012

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Source:

Optics Express, 20 (13), 2012

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Abstract

We demonstrate for the first time that the Hartmann wavefront sensor (HWS) principle can be applied for characterizing the wavefronts of terahertz (THz) electromagnetic radiation. The THz Hartmann wavefront sensor consists of a metallic plate with an array of holes and a twodimensional scanable pyro-electric detector. The THz radiation with different wavefronts was generated by a far-infrared gas laser operated at 2.5 THz in combination with a number of objects that result in known wavefronts. To measure the wavefront, a beam passing through an array of holes generates intensity spots, for which the positions of the individual spot centroids are measured and compared with reference positions. The reconstructed wavefronts are in good agreement with the model expectations.

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