Ultralow-threshold-current-density quantum dot lasers using the dots-in-a-well (DWELL) structure

Guangtian T. Liu; Andreas Stintz; Hua Li; Luke F. Lester; Kevin J. Malloy

doi:10.1117/12.391490

14 July 2000 Ultralow-threshold-current-density quantum dot lasers using the dots-in-a-well (DWELL) structure

Guangtian T. Liu, Andreas Stintz, Hua Li, Luke F. Lester, Kevin J. Malloy

Proceedings Volume 3944, Physics and Simulation of Optoelectronic Devices VIII; (2000) https://doi.org/10.1117/12.391490
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

Quantum dots laser diodes using the dots-in-a-well (DWELL) structure (InAs dots in an InGaAs quantum wells) have exhibited significant recent progress. With a single InAs dot layer in In_0.15Ga_0.85As quantum well, threshold current densities are as low as 26 A cm^-2 at 1.25 micrometer. Quantum dot laser threshold current densities are now lower than any other reported semiconductor laser. In this work, the threshold current density is reduced to 16 A cm^-2 by HR coatings on the same device. Further investigation of performance reveals that use of multiple DWELL stacks improves the modal gain and internal quantum efficiency. It is suggested that carrier heating out of the quantum dots limits the T_O value of these DWELL lasers.

Citation Download Citation

Guangtian T. Liu, Andreas Stintz, Hua Li, Luke F. Lester, and Kevin J. Malloy "Ultralow-threshold-current-density quantum dot lasers using the dots-in-a-well (DWELL) structure", Proc. SPIE 3944, Physics and Simulation of Optoelectronic Devices VIII, (14 July 2000); https://doi.org/10.1117/12.391490

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