Abstract
Two designs of active region for an interband cascade laser, based on double or triple GaInSb/InAs type II quantum wells (QWs), were compared with respect to passive mode-locked operation in the mid-infrared range around 4 µm. The layer structure and electron and hole wavefunctions under external electric field were engineered to allow controlling the optical transition oscillator strength and the resulting lifetimes. As a result, the investigated structures can mimic absorber-like and gain-like sections of a mode-locked device when properly polarized with opposite bias. A significantly larger oscillator strength tuning range for triple QWs was experimentally verified by Fourier-transform photoreflectance.
| Original language | English |
|---|---|
| Article number | 110301 |
| Number of pages | 4 |
| Journal | Japanese Journal of Applied Physics |
| Volume | 56 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 29 Sept 2017 |