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Bow-Tie Cavity for Terahertz Radiation

CNR–Istituto Nazionale di Ottica and LENS (European Laboratory for Non-linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy
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;
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)
PDF [2103 KB, uploaded 25 December 2018]


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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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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