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Room temperature, continuous wave lasing in microcylinder and microring quantum dot laser diodes

Munsch, Mathieu; Claudon, Julien; Malik, N. S.; Gilbert, K.; Grosse, P.; Gérard, Jean-Michel; Albert, F.; Langer, Fabian; Schlereth, T.; Pieczarka, Maciej M.; Höfling, Sven; Kamp, Martin; Forchel, Alfred; Reitzenstein, Stephan

We demonstrate room temperature, continuous wave lasing of laser diodes based on AlGaAs whispering gallery mode (WGM) resonators (microcylinder and microring) embedding a quantum dot (QD) active layer. Using InGaAlAs QDs, high-Q (>60 000) lasing modes are observed around 910 nm, up to 50 °C. Lasing with similar performance is obtained around 1230 nm, using InAs QDs. Furthermore, we show that the current injection in the active part of the device is improved in ring resonators, leading to threshold currents of approximately 4 mA for a device with 80 μm diameter. This geometry also suppresses WGMs with a high radial order, thus simplifying the lasing spectra. In these conditions, stable single-mode and two-color lasing can be obtained.
Published in: Applied Physics Letters (APL), 10.1063/1.3678031, American Institute of Physics (AIP)
  • This content may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This material originally appeared in Appl. Phys. Lett. 100, 031111 (2012) and may be found at