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. 2016 Mar 24;6:23595. doi: 10.1038/srep23595

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(a) P-I-V characterizations of a 4-mm long buried-ridge composite DFB device in pulsed mode and CW operations at 293 K. Inset: CW dual-wavelength operation at λ₁ = 7.46 μm and λ₂ = 8.15 μm with a frequency spacing of 3.4 THz at a current of 1.62 A. (b) THz pulsed and CW powers as functions of current. Inset: CW emitting spectrum at 3.41 THz at a current of 1.62 A.