InGaAsP/InGaAs Quantum Well Lasers using Hollow Square Microcavities

Abstract

We investigated semiconductor lasers using hollow square microcavities with various corner shapes. For hollow square cavities with 45deg-tilted or convex-shaped corners, the ring-type WGMs originating total reflection of light at 4 corners were lased. While the lasing modes from a hollow cavity with concave-shaped asymmetric corners were 12 bounce guided modes originating total reflection at both (inner and outer) flat boundaries. We confirmed the lasing of guided modes by analyzing reduced mode spacing. The quality factor was smaller than that of ring-type WGMs due to the enhanced reflection loss