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Bow-Tie Cavity for Terahertz Radiation

1
CNR–Istituto Nazionale di Ottica and LENS (European Laboratory for Non-linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy
2
NEST, CNR–Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(1), 1; https://doi.org/10.3390/photonics6010001
Received: 23 November 2018 / Revised: 20 December 2018 / Accepted: 24 December 2018 / Published: 25 December 2018
(This article belongs to the Special Issue Terahertz Photonics)
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Abstract

We report on the development, testing, and performance analysis of a bow-tie resonant cavity for terahertz (THz) radiation, injected with a continuous-wave 2.55 THz quantum cascade laser. The bow-tie cavity employs a wire-grid polarizer as input/output coupler and a pair of copper spherical mirrors coated with an unprotected 500 nm thick gold layer. The improvements with respect to previous setups have led to a measured finesse value F = 123, and a quality factor Q = 5.1·105. The resonator performances and the relevant parameters are theoretically predicted and discussed, and a comparison among simulated and experimental spectra is given. View Full-Text
Keywords: resonant cavity; terahertz radiation; quantum cascade laser resonant cavity; terahertz radiation; quantum cascade laser
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Consolino, L.; Campa, A.; Mazzotti, D.; Vitiello, M.S.; De Natale, P.; Bartalini, S. Bow-Tie Cavity for Terahertz Radiation. Photonics 2019, 6, 1.

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