Estimation of the spontaneous emission factor for microdisk lasers via the approximation of whispering gallery modes

Mee Koy Chin*, Daniel Y. Chu, Seng Tiong Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

Microdisk structures have been used to achieve low-threshold lasing. For these microcavity lasers, the spontaneous emission coupling factor β is an important parameter since it determines the threshold current of the laser. Theoretical calculation of β based on the exact solution of the modes in a microdisk is complicated. A simple, approximate method for solving the waveguide modes and the density of states is developed here, using conformal transformation and the Wentzel-Kramers-Brillouin approximation and taking into account the effect of the disk thickness. We find that the β value for a microdisk laser is smaller than that of an ideal laser that has a cylindrical waveguide structure with a strong index guiding. A considerably high value of β can still be achieved, however, in a microdisk laser.

Original languageEnglish (US)
Pages (from-to)3302-3307
Number of pages6
JournalJournal of Applied Physics
Volume75
Issue number7
DOIs
StatePublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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