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Epitaxial Nd:YLF linear waveguide laser.

P Rogin1, J Hulliger

  • 1Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, Berne CH-3012, Switzerland.

Optics Letters
|January 12, 2008
PubMed
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Researchers achieved low-threshold laser operation in neodymium-doped yttrium lithium fluoride (Nd:YLF) waveguide structures using liquid-phase epitaxy. Ridge-type waveguides significantly reduced pump power requirements, paving the way for efficient upconversion lasers.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • Neodymium-doped yttrium lithium fluoride (Nd:YLF) is a key material for solid-state lasers.
  • Waveguide lasers offer advantages in miniaturization and efficiency.
  • Liquid-phase epitaxy (LPE) is a versatile crystal growth technique.

Purpose of the Study:

  • To demonstrate laser operation in Nd:YLF waveguide structures fabricated by LPE.
  • To investigate methods for reducing the threshold pump power in these waveguides.
  • To explore the potential of LPE for developing low-threshold upconversion lasers.

Main Methods:

  • Fabrication of planar and linear Nd:YLF waveguide structures using liquid-phase epitaxy (LPE).
  • Development of ridge-type structures through mechanical polishing and subsequent cladding layer growth.

Related Experiment Videos

  • Characterization of laser performance, including threshold pump power.

    • Main Results:

    • Achieved laser operation in both planar and linear Nd:YLF waveguides.
    • Reduced the threshold pump power from 115 mW in planar waveguides to 8 mW in ridge-type structures.
    • Identified scattering and end-face reflection losses as areas for improvement.

    Conclusions:

    • Ridge-type waveguide structures significantly lower the threshold pump power for Nd:YLF lasers.
    • Further optimization of fabrication and reduction of optical losses can lead to even lower thresholds.
    • LPE is a promising technique for developing efficient, low-threshold upconversion lasers using various activator ions.