The time resolved measurement of ultrashort terahertz-band electric fields without an ultrashort probe

Walsh, D.A. and Snedden, E.W. and Jamison, S.P. (2015) The time resolved measurement of ultrashort terahertz-band electric fields without an ultrashort probe. Applied Physics Letters, 106 (18): 181109. ISSN 0003-6951

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The time-resolved detection of ultrashort pulsed THz-band electric field temporal profiles without an ultrashort laser probe is demonstrated. A non-linear interaction between a narrow-bandwidth optical probe and the THz pulse transposes the THz spectral intensity and phase information to the optical region, thereby generating an optical pulse whose temporal electric field envelope replicates the temporal profile of the real THz electric field. This optical envelope is characterised via an autocorrelation based FROG (frequency resolved optical gating) measurement, hence revealing the THz temporal profile. The combination of a narrow-bandwidth, long duration, optical probe, and self-referenced FROG makes the technique inherently immune to timing jitter between the optical probe and THz pulse and may find particular application where the THz field is not initially generated via ultrashort laser methods, such as the measurement of longitudinal electron bunch profiles in particle accelerators.

Item Type:
Journal Article
Journal or Publication Title:
Applied Physics Letters
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Copyright 2015 American Institute of Physics. The following article appeared in Applied Physics Letters, 106 (18), 2015 and may be found at This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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18 Jun 2018 11:12
Last Modified:
15 Jul 2024 17:57