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Fig. 2

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Performance of the terahertz QCL. (a) Light-current-voltage characteristic of the 6-mm-long and 150-μm-wide laser in continuous wave mode measured at 20 K. (b) Normalized emission spectrum of the laser measured at 1100 mA at 20 K. (c) Inter-mode beat note mapping of the laser measured in the current range from 680 to 1200 mA.

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