Abstract
Broad emission direction with two lobes is analyzed in a spiral-shaped microcavity laser. By pumping the boundary of the InGaAsP semiconductor laser with dc current injection, whispering-gallery-type modes emitting through a notch are obtained. By classifying the lasing modes into mode groups based on the equidistant mode spacing, it is shown that each mode group has its own emission direction with a narrow divergence angle and that a super position of emission direction of dominant mode groups reproduces a far-field pattern of total intensity with two lobes, which is contrary to theoretical results.
| Original language | English |
|---|---|
| Pages (from-to) | 4503-4505 |
| Number of pages | 3 |
| Journal | Optics Letters |
| Volume | 36 |
| Issue number | 23 |
| DOIs | |
| State | Published - 1 Dec 2011 |