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Microstructured KY(WO(4))(2):Gd(3+), Lu(3+), Yb(3+) channel waveguide laser.

D Geskus1, S Aravazhi, C Grivas

  • 1Integrated Optical Microsystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. d.geskus@ewi.utwente.nl

Optics Express
|July 1, 2010
PubMed
Summary

Researchers developed novel microstructured waveguides using potassium yttrium tungstate (KY(WO(4))(2)) doped with rare-earth ions. These waveguides demonstrate efficient laser operation with low threshold and high output power.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Laser Physics

Background:

  • Potassium yttrium tungstate (KY(WO(4))(2)) is a promising host material for solid-state lasers.
  • Rare-earth ion doping (Gd3+, Lu3+, Yb3+) enables tunable laser properties.
  • High refractive index contrast is crucial for efficient waveguide fabrication.

Purpose of the Study:

  • To microstructured epitaxially grown KY(WO(4))(2):Gd3+, Lu3+, Yb3+ layers into channel waveguides.
  • To investigate the laser performance of these microstructured waveguides.
  • To achieve low-threshold and high-efficiency waveguide laser operation.

Main Methods:

  • Epitaxial growth of doped KY(WO(4))(2) layers.
  • Microstructuring using Argon (Ar) beam milling to create ridge channel waveguides.

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  • Overgrowth with an undoped KY(WO(4))(2) layer.
  • Characterization of waveguide structure and laser performance.

    • Main Results:

    • Fabrication of 1.4-microm-deep ridge channel waveguides (2-7 microm width) with high refractive index contrast.
    • Achieved channel waveguide laser operation with a low launched pump power threshold of 5 mW.
    • Obtained a slope efficiency of 62% and an output power of 76 mW.

    Conclusions:

    • Microstructured KY(WO(4))(2):Gd3+, Lu3+, Yb3+ waveguides are highly effective for laser applications.
    • The developed fabrication method enables efficient waveguide laser devices.
    • These results highlight the potential for integrated optics and compact laser sources.