Scientific Results

High-Q resonant cavities for terahertz quantum cascade lasers

Year: 2015

Authors: Campa A., Consolino L., Ravaro M., Mazzotti D., Vitiello M. S., Bartalini S., De Natale P.

Autors Affiliation: INO, Istituto Nazionale di Ottica, CNR, Largo Fermi 6, Firenze, 50125, Italy; LENS, European Laboratory for Non-Linear Spectroscopy, Via Carrara 1, Sesto Fiorentino FI, 50019, Italy; NEST, Istituto Nanoscienze – CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy

Abstract: We report on the realization and characterization of two different designs for resonant THz cavities, based on wire-grid polarizers as input/output couplers, and injected by a continuous-wave quantum cascade laser (QCL) emitting at 2.55 THz. A comparison between the measured resonators parameters and the expected theoretical values is reported. With achieved quality factor Q approximate to 2.5 x 10(5), these cavities show resonant peaks as narrow as few MHz, comparable with the typical Doppler linewidth of THz molecular transitions and slightly broader than the free-running QCL emission spectrum. The effects of the optical feedback from one cavity to the QCL are examined by using the other cavity as a frequency reference. (C) 2015 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 23 (3)      Pages from: 3751  to: 3761

More Information: This work was partly supported by the Italian Ministry of Education, University, and Research (MIUR) through the program FIRB-Futuro in Ricerca 2010, RBFR10LULP; Laserlab-Europe, grant agreement no. 284464, EU 7th Framework Program; ESFRI Roadmap, Extreme Light Infrastructure (ELI) project.
KeyWords: Emission spectroscopy; Feedback; Quantum cascade lasers; Semiconductor lasers, Continuous Wave; Emission spectrums; Frequency reference; Molecular transitions; Quality factor Q; Terahertz quantum-cascade lasers; Theoretical values; Wire grid polarizers, Terahertz waves
DOI: 10.1364/OE.23.003751

Citations: 6
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