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. 2017 Mar 6;7:43806. doi: 10.1038/srep43806

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(a) P-I-V characterization of a 4-mm long HR coated QCL comb device in CW operation at 293 K. (b) Lasing spectra at different currents changing from 0.75 to 1.1 A. The resolution is 0.125 cm⁻¹.