Characteristics of lasing modes in a spiral-shaped microcavity

Abstract

We have numerically investigated the characteristics of the lasing modes in a spiralshaped microcavity laser by solving the Schrödinger-Bloch equation with the nonlinear interaction between the light field and the lasing medium. For overall uniform pumpings, we have found whispering gallery type modes with no directional emission. In case of local pumpings, however, whispering gallery type, quasi-scarred type, and complex type patterns appear in the course of time. Especially, we have also found the evidence of directional emissions from the notch part of the cavity.