Distortion-free enhancement of terahertz signals measured by electro-optic sampling. II. Experiment

Johnson, Jeremy A.; Brunner, Fabian D.J.; Grübel, Sebastian; Ferrer, Andrés; Johnson, Steven L.; Feurer, Thomas (2014). Distortion-free enhancement of terahertz signals measured by electro-optic sampling. II. Experiment. Journal of the Optical Society of America. B - optical physics, 31(5), pp. 1035-1040. Optical Society of America 10.1364/JOSAB.31.001035

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Three methods for distortion-free enhancement of electro-optic sampling measurements of terahertz signals are tested. In the first part of this two-paper series [J. Opt. Soc. Am B 31, 904–910 (2014)], the theoretical framework for describing the signal enhancement was presented and discussed. As the applied optical bias is decreased, individual signal traces become enhanced but distorted. Here we experimentally show that nonlinear signal components that distort the terahertz electric field measurement can be removed by subtracting traces recorded with opposite optical bias values. In all three methods tested, we observe up to an order of magnitude increase in distortion-free signal enhancement, in agreement with the theory, making possible measurements of small terahertz-induced transient birefringence signals with increased signal-to-noise ratio.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Brunner, Fabian Dominik Jürg and Feurer, Thomas

Subjects:

600 Technology > 620 Engineering

ISSN:

0740-3224

Publisher:

Optical Society of America

Language:

English

Submitter:

Martin Frenz-Lips

Date Deposited:

05 Feb 2015 10:11

Last Modified:

05 Oct 2015 09:06

Publisher DOI:

10.1364/JOSAB.31.001035

BORIS DOI:

10.7892/boris.62376

URI:

https://boris.unibe.ch/id/eprint/62376

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