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

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(a) Interferogram generated by a FTIR when measuring the subthreshold spectrum of a HR-coated comb device. Individual bursts in the interferogram are labelled sequentially. The resolution is 0.11 cm⁻¹. (b) Measurement of the GVD and (c) gain of HR-coated QCL-comb as a function of current.