Abstract
The structure and the maximal nonlinear optical (NLO) susceptibility χ(2) are tabulated for more 700 acentric binary oxides, 220 crystals of simple, binary and complex borates and for the same set of 110 carbonates, tartrates, formates, oxalates, acetates and fluoride-carbonates used in ultraviolet and deep ultraviolet optoelectronics. According to the chemical formula, the structural symbols of these crystals have been plotted on the plane of two minimal oxide bond lengths (OBL). It is shown that acentric crystals are positioned on such plane inside the vertical, horizontal and slope intersected ellipses of “acentricity”. The oxide and borate crystals with moderate NLO susceptibility are found in the central parts of these ellipses intersection and, with low susceptibility, on top, at the bottom and border of the ellipses rosette. The nonpolar fluoride-carbonate crystals with high NLO susceptibility are found in the curve-side rhombic parts of the slope ellipse of “acentricity”. The unmonotonous fuzzy dependence “χ(2)” on the OBL of these crystals is observed, and their clear-cut taxonomy on compounds with π– or σ–oxide bonds is also established. It is shown that the correlations of χ(2) with other acentric properties are nonlinear for the whole set of the oxide crystals having their clear maximum at a certain value of the piezoelectric or electro-optic coefficient. The correlation “hardness–thermoconductivity-fusibility” is plotted for oxide crystals, part of which is used at the creation of self-frequency-doubling solid state lasers.
Highlights
Modern fundamental material science is the main basis for the search and growth of new perspective crystals used at the creation of various solid state dielectric devices, for laser physics, acoustoelectronics or nonlinear optics (NLO) [1,2,3,4,5,6]
The set of data on the composition, structure, oxide bond lengths, nonlinear optical (NLO) susceptibility of carbon oxide crystals are compiled in table III (Supplementary Materials)
The prediction, crystal growth, investigation of many properties and the application of new piezoelectric borate crystals in optoelectronics are the outstanding events in the development of solid state physics and solid state chemistry
Summary
Modern fundamental material science is the main basis for the search and growth of new perspective crystals used at the creation of various solid state dielectric devices, for laser physics, acoustoelectronics or nonlinear optics (NLO) [1,2,3,4,5,6]. A general table of the relation “structure-set of acentric properties” for piezoelectric crystals and the key empiric interrelationship “oxide bond length-structure-nonlinear optical susceptibility”, due to increasing lengths of anionic and cationic oxide bonds [11,37,38,39,40,41,42,43,44,45,49,50,51,53,54,55,56,57,58], are presented in this paper. The weak-known systematization of empiric interrelationship “property 1-property 2” between the NLO-, PE-, EO-properties was revised and plotted for the set of oxide crystals [57] It is only, in this paper that we mention the interrelationship between the hardness and melting temperature of oxide crystals, which is very interesting at the creation of solid state lasers, abrasive and other crystals for optoelectronics [58]. Laser and NLO-elements are more stable if they are created from hard and refractory materials [2,58]
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