Terahertz beam spot size measurements by a CCD camera

O. V. Chefonov; A. V. Ovchinnikov; M. B. Agranat; A. N. Stepanov

doi:10.1364/OL.44.004099

Optics Letters
Vol. 44,
Issue 17,
pp. 4099-4102
(2019)
•https://doi.org/10.1364/OL.44.004099

Terahertz beam spot size measurements by a CCD camera

O. V. Chefonov, A. V. Ovchinnikov, M. B. Agranat, and A. N. Stepanov

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O. V. Chefonov, A. V. Ovchinnikov, M. B. Agranat, and A. N. Stepanov, "Terahertz beam spot size measurements by a CCD camera," Opt. Lett. 44, 4099-4102 (2019)

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Abstract

We present the experimental data on the direct measurements of spatial distribution of the terahertz (THz) pulse intensity profile using a commercial silicon-based charge-coupled device (CCD) camera in the spectral range from 1–3 THz. A method to measure the dimensions of a high-intensity THz radiation beam in the focal plane using the CCD camera is proposed and experimentally verified.

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RFL, mm	$r_{DL}$ , μm	$r_{0}$ , μm	$F_{th}$ , ${mJ / cm}^{2}$
50.8	89	$88 \pm 5$	$29 \pm 5$
76.2	134	$131 \pm 12$
101.6	179	$181 \pm 18$

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