Journal
OPTICAL MATERIALS
Volume 69, Issue -, Pages 420-431Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2017.04.012
Keywords
Guanidinium phosphates; GuH(2)PO(4); Gu(2)HPO(4)center dot H2O; Gu(3)PO(4)center dot 3/2 H2O; Refractive indices; Nonlinear optical properties; Vibrational spectra
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Funding
- Czech Science Foundation [14-05506S]
- CUCAM [CZ.02.1.01/0.0/0.0/15_003/0000417]
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Of the three guanidinium phosphates GuH(2)PO(4) (space group P2(1)/c), Gu(2)HPO(4) center dot H2O (space group P (4) over bar2(1) c) and Gu(3)PO(4)center dot H2O (space group Cc) crystal structures and a vibrational spectroscopy study are presented. Large single crystals of GuH(2)PO(4) and Gu(2)HPO(4)center dot H2O are grown. Refractive indices and their dispersion in the wavelength range 365 nm - 1083 nm are determined and used for the analysis of phase matching conditions for collinear SHG in the case of the non-centrosymmetric crystals of Gu(2)HPO(4)center dot H2O. The crystals are not phase-matchable within their transmission range. Both independent components of the SHG tensor of Gu(2)HPO(4) center dot H2O, determined by the Maker fringe method, are given, with d(14) = 0.23 pm/V and d(36) = 0.22 pm/V. In addition, the thermal stability and the anisotropy of thermal expansion of GuH(2)PO(4) and Gu(2)HPO(4) center dot H2O is reported. (C) 2017 Elsevier B.V. All rights reserved.
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