A dual-mode quantum dot laser operating in the excited state

Frédéric Grillot (1) , Nader A Naderi (2) , J. B Wright (3) , R. Raghunathan (2) , M. T. Crowley (2) , Luke F Lester (2)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 CHTM - Center for High Technology Materials
3 SNL - Sandia National Laboratories [Albuquerque]

A dual-mode laser operating in the excited states (ESs) of a quantum dot is realized by combining asymmetric pumping and external optical feedback stabilization. In generating two single-mode emission peaks, a mode separation ranging from 1.3-THz to 3.6-THz is demonstrated over temperature. This effect is attributed to the unique carrier dynamics of the quantum-dot gain medium via the excited state inhomogeneous linewidth coupled with a proper external control. These results are particularly important towards the development of future THz optoelectronic sources with compact size, low fabrication cost, and high performance.

Mots clés: Quantum dots; Optical feedback; Excited states; Pumping; Quantum wells

Domaines: Sciences de l'ingénieur [physics]

Frédéric Grillot, Nader A Naderi, J. B Wright, R. Raghunathan, M. T. Crowley, et al.. A dual-mode quantum dot laser operating in the excited state. Applied Physics Letters, 2011, 99, pp.231110. ⟨10.1063/1.3667193⟩. ⟨hal-01166265⟩