Lowest-order axial and ring mode lasing in confocal quasi-stadium laser diodes

Takehiro Fukushima*, Satoshi Sunada, Takahisa Harayama, Koichiro Sakaguchi, Yasunori Tokuda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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 thatbyusing narrow electrode contact patternsof 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.

Original languageEnglish
Pages (from-to)2515-2520
Number of pages6
JournalApplied Optics
Issue number14
Publication statusPublished - 2012 May 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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