Linear and nonlinear optical properties, pyroelectricity and vibrational spectroscopy of polar guanidinium hydrogen phosphite, GuH.sub.2./sub.PO.sub.3./sub., and hydrogen selenite, GuHSeO.sub.3./sub

0553767 - FZÚ 2022 RIV NL eng J - Journal Article
Němec, I. - Matulková, I. - Krumbe, W. - Andersen, L. - Císařová, I. - Kroupa, Jan - Němec, P. - Bohatý, L. - Becker, P.
Linear and nonlinear optical properties, pyroelectricity and vibrational spectroscopy of polar guanidinium hydrogen phosphite, GuH₂PO₃, and hydrogen selenite, GuHSeO₃
Optical Materials. Roč. 111, Jan. (2021), č. článku 110722. ISSN 0925-3467. E-ISSN 1873-1252
Institutional support: RVO:68378271
Keywords : guanidinium hydrogen phosphite * selenite * crystal structure * refractive indices * nonlinear optical properties * pyroelectricity * vibrational spectra
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.754, year: 2021
Method of publishing: Limited access
www.doi.org/10.1016/j.optmat.2020.110722

For the non-centrosymmetric guanidinium compounds GuH2PO3, GuHSeO3 with polar symmetry P21 a fundamental characterization as optical materials is given, including X-ray crystal structure analysis and a vibrational spectroscopy (Raman and IR) study. In addition, for both polar crystals the pyroelectric coefficients and their temperature dependence are evaluated. Using large single crystals grown from aqueous solution, refractive indices and their dispersion in the wavelength range 435–1083 nm are determined by the prism method. From the data phase matching conditions for collinear second harmonic generation (SHG) are analysed. Both crystals allow the realization of phase matching for SHG of both, typeI and typeII processes. Quantification of SHG properties was performed for both powdered salts and GuH2PO3 single crystals. The measurements of the pyroelectric coefficients in the temperature range 100–340 K show pronounced pyroelectricity but no indication for ferroelectric behaviour.
Permanent Link: http://hdl.handle.net/11104/0328493