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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4256–4266

The effect of the Gouy phase in optical-pump-THz-probe spectroscopy

Saima Ahmed, Janne Savolainen, and Peter Hamm  »View Author Affiliations


Optics Express, Vol. 22, Issue 4, pp. 4256-4266 (2014)
http://dx.doi.org/10.1364/OE.22.004256


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Abstract

We show theoretically as well as experimentally that the Gouy-phase shift, which depends on the exact positioning of a sample in relation to the focus of a probe beam in a pump-probe experiment, may have a pronounced effect on the shape of the pump-probe signal. The effect occurs only when single-cycle probe pulses are used, i.e. when the slowly varying envelope approximation breaks down, while it disappears for multi-cycle pulses. The effect is thus most relevant in THz time-resolved spectroscopy, where such single cycle pulses are most commonly used, but it should not be overlooked also in other spectral regimes when correspondingly short pulses are involved.

© 2014 Optical Society of America

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(300.6270) Spectroscopy : Spectroscopy, far infrared
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(350.5030) Other areas of optics : Phase

ToC Category:
Terahertz Optics

History
Original Manuscript: November 19, 2013
Revised Manuscript: February 10, 2014
Manuscript Accepted: February 11, 2014
Published: February 18, 2014

Citation
Saima Ahmed, Janne Savolainen, and Peter Hamm, "The effect of the Gouy phase in optical-pump-THz-probe spectroscopy," Opt. Express 22, 4256-4266 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-4-4256


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