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

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(a) EL spectra for the strain-balanced single-core design and the lattice matched dual-core design from ref. 13. The shaded area indicates the supported dual wavelength emissions with the frequency spacings up to 5 THz. (b) P-I-V and wall plug efficiency characterizations of a 4.9-mm long uncoated FP device in pulsed mode and CW operations at 293 K. Inset: lasing spectrum at 1.7 A in CW operation.