@article{Mezzapesa:2020:10.1021/acsphotonics.0c01523,
author = {Mezzapesa, FP and Garrasi, K and Schmidt, J and Salemi, L and Pistore, V and Li, L and Davies, GA and Linfield, EH and Riesch, M and Jirauschek, C and Carey, T and Torrisi, F and Ferrari, AC and Vitiello, MS},
doi = {10.1021/acsphotonics.0c01523},
journal = {ACS Photonics},
pages = {3489--3498},
title = {Terahertz frequency combs exploiting an on-chip, solution-processed, graphene-quantum cascade laser coupled-cavity},
url = {http://dx.doi.org/10.1021/acsphotonics.0c01523},
volume = {7},
year = {2020}
}

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TY  - JOUR
AB  - The ability to engineer quantum-cascade-lasers (QCLs) with ultrabroad gain spectra, and with a full compensation of the group velocity dispersion, at terahertz (THz) frequencies, is key for devising monolithic and miniaturized optical frequency-comb-synthesizers (FCSs) in the far-infrared. In THz QCLs four-wave mixing, driven by intrinsic third-order susceptibility of the intersubband gain medium, self-locks the optical modes in phase, allowing stable comb operation, albeit over a restricted dynamic range (∼20% of the laser operational range). Here, we engineer miniaturized THz FCSs, comprising a heterogeneous THz QCL, integrated with a tightly coupled, on-chip, solution-processed, graphene saturable-absorber reflector that preserves phase-coherence between lasing modes, even when four-wave mixing no longer provides dispersion compensation. This enables a high-power (8 mW) FCS with over 90 optical modes, through 55% of the laser operational range. We also achieve stable injection-locking, paving the way to a number of key applications, including high-precision tunable broadband-spectroscopy and quantum-metrology.
AU  - Mezzapesa,FP
AU  - Garrasi,K
AU  - Schmidt,J
AU  - Salemi,L
AU  - Pistore,V
AU  - Li,L
AU  - Davies,GA
AU  - Linfield,EH
AU  - Riesch,M
AU  - Jirauschek,C
AU  - Carey,T
AU  - Torrisi,F
AU  - Ferrari,AC
AU  - Vitiello,MS
DO  - 10.1021/acsphotonics.0c01523
EP  - 3498
PY  - 2020///
SN  - 2330-4022
SP  - 3489
TI  - Terahertz frequency combs exploiting an on-chip, solution-processed, graphene-quantum cascade laser coupled-cavity
T2  - ACS Photonics
UR  - http://dx.doi.org/10.1021/acsphotonics.0c01523
UR  - http://hdl.handle.net/10044/1/86049
VL  - 7
ER  - 

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