Journal
OPTICS EXPRESS
Volume 23, Issue 3, Pages 3751-3761Publisher
Optica Publishing Group
DOI: 10.1364/OE.23.003751
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Funding
- Italian Ministry of Education, University, and Research (MIUR) through program FIRB-Futuro in Ricerca [RBFR10LULP]
- Laserlab-Europe, EU [284464]
- ESFRI Roadmap, Extreme Light Infrastructure (ELI) project
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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
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