title: Ring and axis mode lasing in quasi-stadium laser diodes with concentric end mirrors.
abstract: We fabricated quasi-stadium laser diodes whose resonators consist of two concentric curved end mirrors and two straight sidewall mirrors. We observed two lasing modes that correspond to different beam propagations along the cavity axis and along a ring trajectory, and different far-field patterns with wide angular separation. The modes can be selected by control of an electrode pattern. We also show that the far-field patterns numerically obtained by the extended Fox-Li mode calculation method are in good agreement with the experimental results.
authors.forename: Takehiro
authors.initials: T
authors.lastname: Fukushima
authors.forename: Takahisa
authors.initials: T
authors.lastname: Harayama
authors.forename: Peter
authors.initials: P
authors.lastname: Davis
authors.forename: Pablo O
authors.initials: PO
authors.lastname: Vaccaro
authors.forename: Takehiro
authors.initials: T
authors.lastname: Nishimura
authors.forename: Tahito
authors.initials: T
authors.lastname: Aida