Hexagonal Cs2S2O6 crystals - A new high-gain SRS-active material

High-gain stimulated Raman scattering in hexagonal Cs2S2O6 single crystals has been observed for the first time. All measured multiple Stokes and anti-Stokes generation wavelengths are identified and attributed to the χ(3) active vibration mode (ωSRS1 ≈ 1091 cm−1) of this cesium dithionate. We classify the Cs2S2O6 compound as promising medium for Raman laser converters in the visible and near-IR.