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Refined Sellmeier equations for BaGa4S7.

Kiyoshi Kato, Valeriy V Badikov, Kentaro Miyata

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    This study presents improved Sellmeier equations for the BaGa4S7 crystal, accurately predicting phase-matching for nonlinear optical processes like SHG and SFG across a wide mid-IR spectrum.

    Area of Science:

    • Nonlinear Optics
    • Crystallography
    • Laser Physics

    Background:

    • Accurate optical property data is crucial for designing nonlinear optical devices.
    • Barium Gallium Sulfide (BaGa4S7) is a promising biaxial crystal for mid-infrared applications.
    • Existing Sellmeier equations may not fully capture the refractive properties of BaGa4S7 for all wavelengths.

    Purpose of the Study:

    • To refine and validate Sellmeier equations for the biaxial nonlinear crystal BaGa4S7.
    • To accurately model phase-matching conditions for second-harmonic generation (SHG) and sum-frequency generation (SFG).
    • To cover a broad spectral range relevant to common laser sources.

    Main Methods:

    • Development of refined Sellmeier equations based on experimental phase-matching data.

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  • Comparison of theoretical predictions with experimental results for optical parametric processes.
  • Utilizing data from Nd:YAG and Ho:YLF laser-pumped optical parametric oscillators (OPOs).
  • Inclusion of data from frequency-doubled CO2 lasers.

    • Main Results:

    • The refined Sellmeier equations provide excellent reproduction of phase-matching angles for SHG and SFG.
    • The equations are validated for a wide spectral range (0.7584–8.018 µm).
    • Agreement with experimental data for 1-µm-pumped optical parametric processes beyond 8 µm is demonstrated.

    Conclusions:

    • The refined Sellmeier equations are highly reliable for predicting the optical properties of BaGa4S7.
    • These equations will facilitate the design and optimization of nonlinear optical devices utilizing BaGa4S7.
    • The study extends the applicability of BaGa4S7 for mid-IR frequency conversion technologies.