BGS / BGSe Crystal
BaGaS2 (barium gallium sulfide, BGS) and BaGaSe2 (barium gallium selenide, BGSe) are high-performance broadband nonlinear optical crystals. BGS transmits over 0.35–13.7μm with high nonlinear coefficient and damage threshold, and almost no two-photon absorption of 1μm pump light. It suits efficient high-power nonlinear conversion such as OPO/OPA using 1030/1064nm femtosecond or nanosecond lasers. BGSe extends transmission to 0.47–18μm, also combining high nonlinear coefficient and damage threshold. Direct 1μm pumping enables high-power tunable output across the 3–5μm and 8–14μm atmospheric windows, making it a core material for IR remote sensing, spectroscopy and terahertz technology.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Orientation Accuracy | <+-0.1° |
| Surface Finish [per MIL-O-13830A] | 20/10 per MIL-O-13830A |
| Surface Figure [632.8nm；T>=1mm] | λ/8@632.8nm for T>=1mm |
| Clear-Surface Tolerance | +0/-0.1mm |
| Length Tolerance | ±0.1mm |
| Parallelism | 30 ″ |
| Perpendicularity | 10' |
| Chemical Formula [BGS（BaGa4S7）] | BaGa4S7 |
| Chemical Formula [BGSe（BaGa4Se7）] | BaGa4Se7 |
| Lattice Symmetry [BGS（BaGa4S7）] | (Monoclinic) |
| Lattice Symmetry [BGSe（BaGa4Se7）] | (Monoclinic) |
| Space Group [BGS（BaGa4S7）] | PC |
| Space Group [BGSe（BaGa4Se7）] | PC |
| Melting Point [BGS（BaGa4S7）] | 1050℃ |
| Melting Point [BGSe（BaGa4Se7）] | 1029℃ |
| Optical Homogeneity (Refractive-Index Deviation) Δn [BGS（BaGa4S7）] | Δn=1*10-4 |
| Optical Homogeneity (Refractive-Index Deviation) [BGSe（BaGa4Se7）] | 2.355 g/cm³ |
| Absorption Coefficient [BGS（BaGa4S7）] | <0.005 cm-1 |
| Absorption Coefficient [BGSe（BaGa4Se7）；2.09µm] | <0.01 cm-1 @ 2.09 µm |
| Unit-Cell Parameters (Å) [BGS（BaGa4S7）] | a=7.62，b=6.51，c=14.70，β=121，20 |
| Unit-Cell Parameters (Å) [BGSe（BaGa4Se7）] | a＝7.62，b＝6.51，c14.70, β＝121.24，Z＝2 |
| Transmission Spectral Range [BGS（BaGa4S7）] | 0.35-13.7 μm |
| Transmission Spectral Range [BGSe（BaGa4Se7）] | 0.47~18 μm |
| Band Gap [BGS（BaGa4S7）] | 2.64 eV |
| Band Gap [BGSe（BaGa4Se7）] | 2.64 eV |
| Nonlinear Coefficient [BGS（BaGa4S7）] | d11=18.2 pm/V; d13=20.6 pm/V |
| Nonlinear Coefficient [BGSe（BaGa4Se7）] | d11 = 24.3 pm/V |
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