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Gain and Loss in Active Waveguides Based on Lithographically Defined Quantum Dots

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5 Author(s)
Silverman, K.L. ; Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; Miaja-Avila, L. ; Verma, V.B. ; Coleman, J.J.
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We report on the optical gain and loss of waveguides containing lithographically defined quantum dots. Lasing action has previously been demonstrated in a nominally identical structure. Measurements are made by monitoring the transmission of a resonant pulse while varying the injection current. We measure a maximum modal gain of 1.8 cm-1 at the peak of the ground state emission for a two-layer structure. The peak gain is insufficient for ground state lasing to be achieved in a structure with as-cleaved facets, but the gain per dot is comparable with that demonstrated in self-assembled quantum dots.

Published in:

Photonics Technology Letters, IEEE  (Volume:26 ,  Issue: 13 )

Date of Publication:

July1, 2014

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