Experimental investigation of thermally induced power saturation in vertical-cavity surface-emitting lasers

H. D. Summers, J. Wu, J. S. Roberts

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The physical processes responsible for power saturation and roll-over in vertical-cavity, surface-emitting laser diodes (VCSELs) have been investigated experimentally. Material gain spectra for 810 nm wavelength, AllnGaAs/GaAs VCSELs have been collected over a range of injection currents and temperatures. These data, together with knowledge of the threshold gain, allow the reconstruction of the output power characteristics. By using gain data taken at a temperature of 300 K, the structure-determined influence of mode detuning is studied in isolation from intrinsic material-related effects, such as thermally excited carrier leakage and gain reduction due to thermal broadening of the carrier distributions. The results show that, for these devices, the power roll-over is predominantly due to the thermally induced changes in the carrier distributions, rather than the movement of the lasing mode relative to the gain spectrum.

Original languageEnglish (US)
Pages (from-to)261-265
Number of pages5
JournalIEE Proceedings: Optoelectronics
Volume148
Issue number5-6
DOIs
StatePublished - Oct 1 2001

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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