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Open AccessArticle

RF Injection of THz QCL Combs at 80 K Emitting over 700 GHz Spectral Bandwidth

Institute for Quantum Electronics, Department of Physics, ETH Zürich, 8093 Zürich, Switzerland
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Photonics 2020, 7(1), 9; https://doi.org/10.3390/photonics7010009
Received: 3 December 2019 / Revised: 6 January 2020 / Accepted: 14 January 2020 / Published: 16 January 2020
We report about RF injection locking of an homogeneous THz quantum cascade laser operating at 3 THz central frequency. The extremely diagonal nature of the optical transition, combined with low-loss copper-based double-metal waveguides, allow CW operation up to 105 K and CW power in excess of 5.6 mW measured at 80 K. Terahertz emission spanning up to 600 GHz, together with a narrow beatnote, indicate comb operation at 80 K, and strong RF injection clearly modifies the laser spectrum up to 700 GHz spectral bandwidth making these devices ideal candidates for an on-chip dual comb spectrometer. View Full-Text
Keywords: THz QCL; frequency comb; RF injection; broadband THz QCL; frequency comb; RF injection; broadband
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MDPI and ACS Style

Forrer, A.; Bosco, L.; Beck, M.; Faist, J.; Scalari, G. RF Injection of THz QCL Combs at 80 K Emitting over 700 GHz Spectral Bandwidth. Photonics 2020, 7, 9.

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