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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 13 — Jun. 18, 2012
  • pp: 14380–14391

Terahertz wavefronts measured using the Hartmann sensor principle

M. Cui, J. N. Hovenier, Y. Ren, A. Polo, and J. R. Gao  »View Author Affiliations


Optics Express, Vol. 20, Issue 13, pp. 14380-14391 (2012)
http://dx.doi.org/10.1364/OE.20.014380


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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 two-dimensional 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.

© 2012 OSA

OCIS Codes
(100.5070) Image processing : Phase retrieval
(040.2235) Detectors : Far infrared or terahertz

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 27, 2012
Revised Manuscript: May 27, 2012
Manuscript Accepted: May 29, 2012
Published: June 13, 2012

Citation
M. Cui, J. N. Hovenier, Y. Ren, A. Polo, and J. R. Gao, "Terahertz wavefronts measured using the Hartmann sensor principle," Opt. Express 20, 14380-14391 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-13-14380


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