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Low-threshold two-dimensional annular Bragg lasers.

Jacob Scheuer1, William M J Green, Guy DeRose

  • 1Department of Applied Physics, Mail Stop 128-95, California Institute of Technology, Pasadena, California 91125, USA. koby@caltech.edu

Optics Letters
|November 24, 2004
PubMed
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Researchers demonstrate room-temperature lasing at telecommunication wavelengths using annular resonators with radial Bragg reflectors. Low submilliwatt pump thresholds were achieved, showing potential for efficient optical devices.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Annular resonators with radial Bragg reflectors offer unique optical properties.
  • Achieving efficient lasing at telecommunication wavelengths is crucial for optical communications.

Purpose of the Study:

  • To demonstrate room-temperature lasing in annular resonators with radial Bragg reflectors.
  • To investigate the performance characteristics, including pump thresholds and quality factors.

Main Methods:

  • Fabrication and characterization of annular resonators with specific defect widths and radii.
  • Pulsed optical pumping at room temperature.
  • Spectroscopic analysis to measure lasing spectra and quality factors.

Main Results:

Related Experiment Videos

  • Successful demonstration of lasing at telecommunication wavelengths.
  • Observed submilliwatt pump threshold levels for resonators with 0.5-1.5-wavelength-wide defects.
  • Estimated quality factors of the resonator modal fields to be in the order of a few thousand.
  • Demonstrated electromagnetic field guidance by the defect.

    • Conclusions:

    • Annular resonators with radial Bragg reflectors are effective for room-temperature lasing at telecommunication wavelengths.
    • The demonstrated low pump thresholds indicate potential for efficient and compact optical sources.
    • The results show good agreement between experimental measurements and theoretical calculations.