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Ion-exchanged Tm3+:glass channel waveguide laser.

Amol Choudhary1, Pradeesh Kannan, Jacob I Mackenzie

  • 1Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, UK. ac12g10@orc.soton.ac.uk

Optics Letters
|April 3, 2013
PubMed
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Researchers developed a new thulium-doped germanate glass waveguide laser using ion-exchange. This novel device operates continuously at 1.9 μm with a low threshold and high efficiency.

Area of Science:

  • Materials Science
  • Optics and Photonics
  • Laser Physics

Background:

  • Thulium (Tm3+)-doped glass lasers are crucial for applications requiring specific infrared wavelengths.
  • Developing efficient and compact waveguide lasers is essential for integrated photonics.
  • Ion-exchange is a promising technique for fabricating optical waveguides in glass.

Purpose of the Study:

  • To demonstrate continuous wave (CW) laser action in a Tm3+-doped germanate glass channel waveguide.
  • To investigate the performance characteristics, including threshold and slope efficiency, of the fabricated waveguide laser.
  • To establish the feasibility of using ion-exchange for creating Tm3+-doped glass waveguide lasers.

Main Methods:

  • Fabrication of a Tm3+-doped germanate glass channel waveguide using the ion-exchange method.

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  • Characterization of the waveguide laser performance under continuous wave optical pumping.
  • Measurement of key laser parameters such as absorbed power threshold, slope efficiency, and propagation loss.

    • Main Results:

    • Successful demonstration of CW laser operation around 1.9 μm in the ion-exchanged Tm3+-doped germanate glass waveguide.
    • Achieved a low absorbed power threshold of 44 mW.
    • Obtained a maximum slope efficiency of 6.8% with a propagation loss of 0.3 dB/cm at the lasing wavelength.

    Conclusions:

    • This work represents the first demonstration of an ion-exchanged Tm3+-doped glass waveguide laser.
    • The results highlight the potential of ion-exchange fabrication for creating efficient Tm3+-doped glass waveguide lasers for 1.9 μm applications.
    • The low threshold and reasonable efficiency suggest suitability for various integrated photonic applications.