VECSEL optimization using microscopic many-body physics

Jörg Hader, Tsuei Lian Wang, J. Michael Yarborough, Colm A. Dineen, Yushi Kaneda, Jerome V. Moloney, Bernardette Kunert, Wolfgang Stolz, Stephan W. Koch

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Vertical external cavity surface-emitting lasers (VECSELs) are designed and analyzed using an approach based on fully microscopically computed material properties like gain and carrier recombination rates. Very good agreement between theoretical predictions and measured characteristics of the realized devices is demonstrated. The high accuracy of the theoretical models allows one to determine even small deviations between the nominal designs and actual realizations. The models are used to find optimization strategies. It is shown how the external efficiency can be strongly improved using surface coatings that reduce the pump reflection while retaining the gain-enhancing cavity effects at the lasing wavelength. It is shown how incomplete pump absorption can be detrimental to the device performance and how this problem can be reduced using optimized distributed Bragg reflectors and metallization layers. A combination of improved metallization and use of such a coating more than doubles the external efficiency and maximum power for a realized VECSEL operating at 1010 nm and the theory indicates that further significant improvements are possible.

Original languageEnglish (US)
Article number5742673
Pages (from-to)1753-1762
Number of pages10
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume17
Issue number6
DOIs
StatePublished - Apr 7 2011

Keywords

  • Charge carrier lifetime
  • photoluminescence (PL)
  • reflection
  • semiconductor device modeling
  • semiconductor lasers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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