Analysis of the internal optical losses of the 89X nm-range intracavity-contacted vertical-cavity surface-emitting lasers

The paper presents a study of static characteristics of the 89X nm-range vertical-cavity surface-emitting lasers in the geometry of a vertical-microcavity with intracavity contacts and diamond-shaped oxide-confined current aperture. The proposed microcavity design could simultaneously provide a single-mode lasing regime and narrow laser-emission line. The internal optical losses were evaluated for devices with different-size oxide-confined current apertures. It was shown that the proposed design could provide a current injection efficiency of more than $\sim$80% and internal optical loss less than 12 cm$^{-1}$ (for the effective cavity length of 3.4 $\mu$m) in the current aperture size range of 1.5–3 $\mu$m, which is extremely important for minimizing threshold currents in single-mode lasers with small apertures.