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Nd:LiTaO(3) waveguide laser.

N A Sanford, J A Aust, K J Malone

    Optics Letters
    |October 3, 2009
    PubMed
    Summary
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    Researchers developed waveguide lasers in lithium tantalate, achieving low threshold powers. These devices operate near 1092 and 1076 nm, showing potential for integrated optics applications.

    Area of Science:

    • Materials Science
    • Optoelectronics
    • Laser Physics

    Background:

    • Lithium tantalate (LiTaO3) is a promising material for integrated optics.
    • Neodymium (Nd) and Titanium (Ti) codiffusion enables waveguide fabrication in LiTaO3.
    • Developing efficient waveguide lasers is crucial for miniaturized optical systems.

    Purpose of the Study:

    • To fabricate and characterize waveguide lasers operating near 1092 and 1076 nm in Z-cut Nd-Ti codiffused LiTaO3.
    • To investigate the influence of fabrication parameters on laser performance.
    • To determine the threshold power and slope efficiency of the fabricated devices.

    Main Methods:

    • Z-cut LiTaO3 substrates were codiffused with Nd and Ti.
    • Two wafers with varying Nd film thickness (7 nm and 15 nm) were prepared.

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  • Ti stripes of different widths and thicknesses were diffused at high temperatures (1500°C).
  • Waveguide lasers were pumped at 750 nm and their optical output characterized.

    • Main Results:

    • Waveguide lasers operating at approximately 1092 nm and 1076 nm were successfully fabricated.
    • Lower threshold pump power (100 mW) was achieved in waveguides from wafer 2 (15 nm Nd film).
    • The best waveguides from wafer 2 exhibited a slope efficiency of 0.07%.

    Conclusions:

    • Nd-Ti codiffusion in Z-cut LiTaO3 is an effective method for fabricating waveguide lasers.
    • Optimized diffusion parameters, particularly Nd film thickness, significantly impact laser threshold.
    • These results demonstrate the potential of LiTaO3-based waveguide lasers for integrated photonic applications.