Ultrasonic measurement of the elastic properties of benzoyl glycine single crystals
- 52 Downloads
Certain organic crystals are found to possess high non-linear optical coefficients, often one to two orders of magnitude higher than those of the well-known inorganic non-linear optical materials. Benzoyl glycine is one such crystal whose optical second-harmonic generation efficiency is much higher than that of potassium dihydrogen phosphate. Single crystals of benzoyl glycine are grown by solvent evaporation technique usingN, N-dimethyl formamide as the solvent. All the nine second-order elastic stiffness constants of this orthorhombic crystal are determined from ultrasonic wave velocity measurements employing the pulse echo overlap technique. The anisotropy of elastic wave propagation in this crystal is demonstrated by plotting the phase velocity, slowness, Young’s modulus and linear compressibility surfaces along symmetry planes. The volume compressibility, bulk modulus and relevant Poisson’s ratios are also determined. Variation of the diagonal elastic stiffness constants with temperature over a limited range are measured and reported.
KeywordsBenzoyl glycine non-linear optical crystals elastic constants ultrasonic measurements phase velocity surfaces
PACS Nos62.20.Dc 43.35.+d
Unable to display preview. Download preview PDF.
- V G Dmitriev, G G Gurzadyan and D N Nikogosyan,Handbook of nonlinear optical crystals (Springer-Verlag, New York, 1997)Google Scholar
- J Badan, R Hierle, A Perigaud and J Zyss,Nonlinear optical properties of organic molecules and polymeric materials (Am. Chem. Soc. Symp. Ser. 233; Ed. D J Williams, Am. Chem. Soc., Washington DC, 1993)Google Scholar
- D S Chemla and J Zyss (eds),Nonlinear optical properties of organic molecules and crystals (Academic Press, New York, 1987) vols 1 and 2Google Scholar
- R A Hann and D Bloor (eds),Organic materials for nonlinear optics (Royal Society of Chemistry, 1989)Google Scholar
- H Ringertz,Acta Crystallogr. B27, 285 (1971)Google Scholar
- J E May Jr,IRE Natl. Conv. Rec. 6 (Pt. 2), 134 (1958)Google Scholar
- E P Papadakis, inPhysical acoustics edited by W P Mason, R N Thurston (Academic Press, New York, 1976) vol. XIIGoogle Scholar
- H J McSkimin, inPhysical acoustics edited by W P Mason (Academic Press, New York, 1964) vol. I. Pt. AGoogle Scholar
- B A Auld,Acoustic fields and waves in solids (John Wiley and Sons, NY, 1973) vol. 1Google Scholar