Observation of stimulated Raman scattering in polar tetragonal crystals of barium antimony tartrate trihydrate, Ba[Sb2((+)C4H2O6)2]·3H2O

The non-centrosymmetric polar tetragonal (P41) barium antimony tartrate trihydrate, Ba[Sb2((+)C4H2O6)2]·3H2O, was found to be an attractive novel semi-organic crystal manifesting numerous χ(2)- and χ(3)-nonlinear optical interactions. In particular, with picosecond single- and dual-wavelength pumping SHG and THG via cascaded parametric four-wave processes were observed. High-order Stokes and anti-Stokes lasing related to two SRS-promoting vibration modes of the crystal, with ωSRS1 ≈ 575 cm−1 and ωSRS2 ≈ 2940 cm−1, takes place. Basing on a spontaneous Raman investigation an assignment of the two SRS-active vibration modes is discussed.