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Vertical cavity surface emitting terahertz laser.

A V Kavokin1, I A Shelykh, T Taylor

  • 1Spin Optics Laboratory, St. Petersburg State University, 1, Ulianovskaya, 198504, Russia.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

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Researchers demonstrate terahertz lasers using semiconductor microcavities and quantum wells. Optical pumping at specific frequencies enables stimulated terahertz emission, producing dual optical and terahertz laser output.

Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Semiconductor microcavities offer a platform for novel light-matter interactions.
  • Quantum wells are crucial for achieving strong coupling regimes in optical devices.
  • Terahertz (THz) lasers are valuable for spectroscopy and imaging.

Purpose of the Study:

  • To investigate the realization of vertical cavity surface emitting terahertz lasers.
  • To explore the strong coupling regime in semiconductor microcavities for THz emission.
  • To analyze the influence of pumping light statistics on lasing thresholds.

Main Methods:

  • Fabrication of semiconductor microcavities with embedded quantum wells.
  • Optical pumping of the microcavity at half the frequency of the 2p exciton state.

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  • Observation and analysis of stimulated terahertz transitions and dual-range laser emission.

    • Main Results:

    • Successful realization of vertical cavity surface emitting terahertz lasers.
    • Achieved strong coupling between cavity photons and 2p excitons.
    • Demonstrated stimulated terahertz emission populating the lower exciton-polariton branch.
    • Observed laser emission in both optical and terahertz ranges.
    • Identified sensitivity of the lasing threshold to pumping light photon statistics.

    Conclusions:

    • Vertical cavity semiconductor microcavities are viable for generating terahertz lasers.
    • The strong coupling regime and specific optical pumping are key to achieving THz emission.
    • Photon statistics of the pump light significantly impact the lasing threshold, offering a control mechanism.