Stimulated Raman scattering in monoclinic non-centrosymmetric guanylurea(1+) hydrogen phosphite (GUHP)

Monoclinic non-centrosymmetric guanylurea(1+) hydrogen phosphite (GUHP), (NH2)(2)CNHCO(NH2)H2PO3, was found to be an attractive SRS-active crystal manifesting numerous ((3))- and ((2))-nonlinear optical interactions. In particular, with picosecond single- and dual-wavelength pumping SHG, THG (via cascaded parametric four-wave processes), high-order Stokes and anti-Stokes lasing related to the ten SRS-active phonon modes of the crystal, octave spanning ((3))-lasing combs and cross-cascaded ((3)(3)) effects with different pairs of SRS-phonons were observed. The comparative estimation of the first Stokes steady-state Raman gain coefficients in the near-IR region allows the tentative conclusion, that their values can satisfy the practical requirements for the development of Raman laser converters. All recorded Raman-induced lasing lines were identified and attributed to the ((3))-active vibration modes of the crystal. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim