Author:
Morrison C. B.,Zinkiewicz L. M.,Burghard A.,Botez D.
Abstract
The twin-channel laser (TCL)(1) consists of two (substrate) channels separated by a shallow mesa, with current confinement provided by back-biased pn junctions on both sides of the structure. Due to enhanced gain above the mesa, the symmetric mode is favored to lase(1~4). Thus stable fundamentalmode operation to powers around 100 mW has been achieved(5). However, above ~100 mW the beam shifts and broadens as a result of spatial hole burning. Here we present a modified TCL device, which, while preserving symmetric-mode lasing, operates in a significantly stabler and narrower beam than the TCL device.