Optical beatnote detection of a portable THz QCL comb by direct microwave mixing onto an Hot-electron bolometer

Sara Cibella; Guido Torrioli; Paolo Micheletti; Urban Senica; Maria Gambelli; Pasquale Carelli; Ennio Giovine; Mattias Beck; Jerome Faist; Giacomo Scalari

doi:10.1117/12.3002664

12 March 2024 Optical beatnote detection of a portable THz QCL comb by direct microwave mixing onto an Hot-electron bolometer

Sara Cibella, Guido Torrioli, Paolo Micheletti, Urban Senica, Maria Gambelli, Pasquale Carelli, Ennio Giovine, Mattias Beck, Jerome Faist, Giacomo Scalari

Author Affiliations +

Proceedings Volume PC12885, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII; PC1288508 (2024) https://doi.org/10.1117/12.3002664
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

We present optical beatnote detection from a THz QCL comb operating at 80 K in a small nitrogen-cooled dewar. The 21.7 GHz comb beatnote is detected by downconversion, directly mixing free-space signals from the QCL and a microwave synthesizer onto an NbN HEB optimized for RF frequencies. The setup constitutes a very convenient platform for the study of QCL-based optical frequency combs and a building block for compact, portable frequency comb fast spectrometers.

Conference Presentation

Citation Download Citation

Sara Cibella, Guido Torrioli, Paolo Micheletti, Urban Senica, Maria Gambelli, Pasquale Carelli, Ennio Giovine, Mattias Beck, Jerome Faist, and Giacomo Scalari "Optical beatnote detection of a portable THz QCL comb by direct microwave mixing onto an Hot-electron bolometer", Proc. SPIE PC12885, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII, PC1288508 (12 March 2024); https://doi.org/10.1117/12.3002664

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