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


Ahmed, Saima; Savolainen, Janne; Hamm, Peter (2014). The effect of the Gouy phase in optical-pump-THz-probe spectroscopy. Optics Express, 22(4):4256.

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.

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:February 2014
Deposited On:18 Jul 2014 09:17
Last Modified:05 Apr 2016 17:58
Publisher:Optical Society of America
ISSN:1094-4087
Funders:Swiss National Science Foundation (SNF) through the National Center of Competence and Research (NCCR) MUST
Additional Information:This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-4-4256. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1364/OE.22.004256
PubMed ID:24663749

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