The effect of wetting-layer states on the gain-current characteristics of quantum dot lasers was discussed. It was demonstrated that the saturation results from occupancy of high lying energy states rather than complete population inversion of the available dot states. The gain data indicated that at 100 K the dots are decoupled from the wetting layer and in this case total population inversion can be achieved.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)