title: Lowest-order axial and ring mode lasing in confocal quasi-stadium laser diodes.
abstract: We investigated the lasing modes of quasi-stadium laser diodes that have confocal cavity geometries, with stripe electrode contacts formed either along the cavity axis or a diamond-shaped trajectory. It was clearly demonstrated that by using narrow electrode contact patterns of 2 μm width, the lowest-order axial and ring modes were excited selectively. On the other hand, the second-lowest-order axial and ring modes were excited by using broad electrode patterns of 14 μm width. Experimentally obtained far-field patterns for lasers with broad and narrow electrode contact patterns agree very well with the simulation results obtained using an extended Fox-Li mode calculation method.
authors.affiliation: Department of Information and Communication Engineering, Okayama Prefectural University, Soja, Okayama, Japan. fuku@c.oka‐pu.ac.jp
authors.forename: Takehiro
authors.initials: T
authors.lastname: Fukushima
authors.forename: Satoshi
authors.initials: S
authors.lastname: Sunada
authors.forename: Takahisa
authors.initials: T
authors.lastname: Harayama
authors.forename: Koichiro
authors.initials: K
authors.lastname: Sakaguchi
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Tokuda