Optical and Quantum Electronics

, Volume 24, Issue 2, pp S245–S272 | Cite as

Controlling spontaneous emission and threshold-less laser oscillation with optical microcavities

  • H. Yokoyama
  • K. Nishi
  • T. Anan
  • Y. Nambu
  • S. D. Brorson
  • E. P. Ippen
  • M. Suzuki
Papers

Abstract

We describe the alteration of spontaneous emission of materials in optical microcavities having dimensions on the order of the emitted wavelength. Particular attention is paid to one-dimensional optical confinement structures with pairs of planar reflectors (planar microcavities). The presence of the cavity causes great modifications in the emission spectrum and spatial emission intensity distribution accompanied by changes in the spontaneous emission lifetime. Experimental results are shown for planar microcavities containing GaAs quantum wells or organic dye-embedded Langmuir-Brodgett films as light emitting layers. Also discussed are the laser oscillation properties of microcavities. A remarkable increase in the spontaneous emission coupling into the laser oscillation mode is expected in microcavity lasers. A rate equation analysis shows that increasing the coupling of spontaneous emission into the cavity mode causes the disappearance of the lasing threshold in the input-output curve. Experimentally verification is presented using planar optical microcavities confining an organic dye solution. The coupling ratio of spontaneous emission into a laser mode increases to be as large as 0.2 for a cavity having a half wavelength distance between a pair of mirrors. At this point, the threshold becomes quite fuzzy. Differences between the spontaneous emission dominant regime and the stimulated emission dominant regime are examined with emission spectra and emission lifetime analyses.

Keywords

GaAs Spontaneous Emission Laser Oscillation Coupling Ratio Emission Lifetime 

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • H. Yokoyama
    • 1
  • K. Nishi
    • 1
  • T. Anan
    • 1
  • Y. Nambu
    • 1
  • S. D. Brorson
    • 2
  • E. P. Ippen
    • 2
  • M. Suzuki
    • 3
  1. 1.Opto-Electronics Research LaboratoriesNEC CorporationTsukubaJapan
  2. 2.Department of Electrical Engineering and Computer Science and Research Laboratory of ElectronicsMassachusetts Institute of TechnologyCambridgeUSA
  3. 3.Functional Devices Research LaboratoriesNEC Corporation 4-1-1 MiyazakiKawasakiJapan

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