Continuous-wave operation up to 20 °C of deep-ridge npn-InGaAsP/InP multiple quantum well transistor laser emitting at 15-μm wavelength Qiao, L. J. ; Liang, S. ; Han, L. S. ; Xu, J. J. ; Zhu, H. L. ; Wang, W. Abstract Publication: Optics Express Pub Date: May 2015 DOI: 10.1364/OE.23.011388 Bibcode: 2015OExpr..2311388Q