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. 2017 Sep 1;3(9):e1603317. doi: 10.1126/sciadv.1603317

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Frequency of the beat note f_b, plotted as a function of the THz frequency comb repetition rate, while keeping the QCL driving current at 540 mA and the T_H fixed at 75 K. This measurement is used for the determination of N. (B) Frequency tuning of the 2.58-THz emission line of the DFG-QCL as a function of the QCL T_H, measured while keeping the QCL driving current fixed at 540 mA. The 2.49-THz emission line shows a similar dependence. (C) QCL frequency tuning of the 2.58-THz emission line as a function of the driving current at different T_H. The 2.49-THz emission line shows a similar dependence.