Refractive index database

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Optical constants of BaGa4Se7 (Barium gallium selenide, BGSe)
Badikov et al 2010: n(γ) 0.480–10.4 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



nγ; room temperature.


V. Badikov, D. Badikov, G. Shevyrdyaeva, A. Tyazhev, G. Marchev, V. Panyutin, V. Petrov, A. Kwasniewski. Phase-matching properties of BaGa4S7 and BaGa4Se7: Wide-bandgap nonlinear crystals for the mid-infrared, Phys. Status Solidi RRL, 5, 31–33 (2010)


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BaGa4Se7 (BGSe)

BaGa4Se7, commonly abbreviated as BGSe, is a chalcogenide-based nonlinear optical crystal known for its phase-matching capabilities and broad transparency window. This material is particularly suited for frequency conversion applications in the mid-infrared region, including second-harmonic generation (SHG), sum-frequency generation (SFG), and optical parametric oscillation (OPO). BGSe exhibits high nonlinear optical coefficients, as well as a high laser damage threshold, making it well-suited for high-power applications. The crystal is generally grown using techniques like the Bridgman-Stockbarger method, and can be cut and polished into high-quality facets for optimal performance. One important consideration for this material is its sensitivity to moisture and other environmental factors; thus, careful handling and storage are required to maintain its optical properties. Overall, BGSe offers a compelling combination of properties that make it a valuable material for nonlinear optics, especially for applications requiring high efficiency and broad tunability in the mid-infrared range.

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