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

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...

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Bibliographic Details
Published in:Photonics 2020-03, Vol.7 (1), p.9
Main Authors: Forrer, Andres, Bosco, Lorenzo, Beck, Mattias, Faist, Jérôme, Scalari, Giacomo
Format: Article
Language:English
Subjects:
Bandwidths
broadband
Emission measurements
frequency comb
Frequency locking
Injection
Lasers
Optical transition
Quantum cascade lasers
rf injection
Spectral emittance
Spectrum allocation
Spectrum analysis
thz qcl
Waveguides
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Summary: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.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics7010009