title: Effective reflectivity from self-imaging in a Talbot cavity and its effect on the threshold of a finite 2-D surface emitting laser array.
abstract: Using a self-imaged diffraction coupled model in a Talbot cavity for vertical cavity surface emitting laser arrays, the effect of self-imaged reflections on the lasing threshold of a finite 2-D array was investigated. Array size and the ratio defined by the element diameter/element spacing were found to affect the effective reflectivity as seen from the laser cavities and, ultimately, the device threshold. A general curve showing the dependence of the 2-D coupling coefficient on the array fill factor and array size has been found. Minimum levels of laser facet reflectivities have been obtained as a function of the array fill factor for practical devices with low threshold current densities.
  
  
  BACKGROUND
  2-D coherent arrays, self-imaging, Talbot effect, laser arrays.
authors.forename: E
authors.initials: E
authors.lastname: Ho
authors.forename: F
authors.initials: F
authors.lastname: Koyama
authors.forename: K
authors.initials: K
authors.lastname: Iga