Monday, 9 July 2018

Experimental Gouy phase shift compensation in Terahertz time-domain spectroscopy

Koleják, Pierre, Kamil Postava, Martin Micica, Petr Kuzel, Filip Kadlec, and Jaromír Pištora. "Experimental Gouy phase shift compensation in Terahertz time-domain spectroscopy." Photonics and Nanostructures-Fundamentals and Applications(2018).

Terahertz time-domain spectroscopy experiments are usually carried out with focused beams. In this case the Gouy phase shift modifies the retrieved dielectric spectra of thick samples [Opt. Express 18, 15338 (2010)]. We show that a significant influence of the Gouy shift occurs also in commercial THz spectrometers where the focusing conditions may be a priori unknown. A method of experimental compensation of the Gouy shift influence is described and demonstrated.

… In this work we use the time domain spectrometer TeraviewTPS Spectra 3000, which uses 90 fs pulses at 780 nm delivered by the second harmonic of Er:doped fiber laser …Scheme of the measuring system (TPS spectra 3000 from Teraview company) with the … 

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