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Tunable third-harmonic generation in a solid-core tellurite glass fiber.

Aoxiang Lin1, Aleksandr Ryasnyanskiy, Jean Toulouse

  • 1Center for Optical Technologies and Physics Department, Lehigh University, Bethlehem, Pennsylvania 18015, USA. aoxiang@opt.ac.cn

Optics Letters
|September 3, 2011
PubMed
Summary

Researchers developed a low-loss tellurite glass fiber for efficient frequency conversion. This fiber enables tunable visible third-harmonic generation from near-infrared wavelengths, with enhanced efficiency for mid-infrared to near-infrared conversion.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nonlinear Optics

Background:

  • Tellurite glass fibers offer unique nonlinear optical properties.
  • Efficient frequency conversion is crucial for various photonic applications.
  • Low-loss optical fibers are essential for high-power nonlinear processes.

Purpose of the Study:

  • To fabricate a solid-core tellurite glass fiber with low optical loss.
  • To investigate third-harmonic generation (THG) in the fabricated fiber.
  • To explore frequency conversion efficiency from near-infrared and mid-infrared regions.

Main Methods:

  • Fabrication of a solid-core tellurite glass fiber using built-in casting preform and rod-in-tube drawing.
  • Pumping a 10 cm fiber piece with picosecond pulses at high peak power densities (3-5 × 10^12 W/cm^2).

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  • Characterization of third-harmonic power conversion and coherence lengths.

    • Main Results:

    • Achieved a tellurite glass fiber with a low loss of 1.8 dB/m at 1.55 μm.
    • Demonstrated tunable visible third-harmonic generation (1500–1680 nm) with 0.1% conversion efficiency.
    • Observed enhanced frequency conversion efficiency from mid-IR (2200–2500 nm) to near-IR due to longer coherence lengths (12–20 μm).

    Conclusions:

    • The developed tellurite glass fiber is suitable for efficient nonlinear optical processes.
    • Picosecond pulse pumping enables tunable third-harmonic generation in the visible spectrum.
    • The fiber's properties facilitate efficient mid-IR to near-IR frequency conversion.