Observation of a laserlike transition in a microcavity exciton polariton system

Stanley Pau, Hui Cao, Joseph Jacobson, Gunnar Björk, Yoshihisa Yamamoto, Atac Imamoğlu

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


We present experimental evidence of spontaneous buildup of coherent exciton polariton population in a microcavity, i.e., an exciton polariton laser. The laser phase transition was confirmed by the increased differential quantum efficiency and decreased linewidth of the lasing polariton mode due to onset of final-state stimulations and the decreased differential quantum efficiency of a nonlasing polariton due to onset of gain clamping at threshold. The exciton polariton laser is distinctly different from an optical laser because of its density-dependent scattering mechanism. The rate equations, taking into account phonon-assisted polariton emission and the polariton-reservoir exciton scattering rate, explain the measurement results well.

Original languageEnglish (US)
Pages (from-to)R1789-R1792
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
StatePublished - 1996

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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