Single crystal growth and characterization of SrAlF5 and Sr1−xEu2+xAlF5

Refractive index of and derived grating period for UV/VUV quasi-phase-matching SHG

“…SrAlF 5 is another fluoride compound, which has been shown to be transparent between 0.16 and 10 mm approximately [3,4]. Initially, Mu¨hll et al [5] suggested by single-crystal diffraction analysis, that to a first approximation the space group is I4, although in fact a small distortion along the c-axis doubles the c parameter, the space group becoming P4, which is also noncentrosymmetric.…”

Advantageous growth characteristics and properties of compared with for UV/VUV nonlinear optical applications

“…Subsequently, high-purity CF 4 gas (99.99%) was slowly flowed into the furnace and the powders were melted. BaMgF 4 and SrAlF 5 melt congruently at 920 and 880 C; respectively [13,19]. After seeding, crystal rotation rate was fixed at 10 rpm, and the pulling rate was varied between 1 and 3 mm/h.…”

“…Initially, Mu¨hll et al suggested by single-crystal diffraction analysis, that to a first approximation the space group is the noncentrosymmetric I4; although in fact a small distortion along the c-axis doubles the c parameter, the space group becoming P4 [14], which is also noncentrosymmetric. On contrast, Meehan and Wilson indicated the centrosymmetric space group I4 1 =a; which excludes any ferroelectric properties [13]. Later, on the basis of the I4 space group, Abrahams et al showed that a structure of opposite polarity can be obtained by atomic displacements no greater than about 0.05 nm along the c-axis, and predicted it by a ferroelectric-paramagnetic phase transition temperature at about 685 K and an estimated spontaneous polarization in the range 9-48 mC=cm 2 [15].…”

“…PP of BaMgF 4 has been already obtained [12], however, to our knowledge no SHG emission could be observed to date. SrAlF 5 is another fluoride compound, which has been shown to be transparent between 0.16 and 10 mm approximately [13]. Among the literature, there is a controversy about the assignment of the crystalline space group.…”

Melting behavior and growth of colquiriite laser crystals

“…Therefore, S2 is not a binary subsystem. SrAlF 5 melts congruently [15] and LiF-SrAlF 5 is a true binary subsystem, but due to the incongruent melting of the counterpart CaAlF 5 the section S1 LiF-CaAlF 5 is not binary [11]. The determination of phase equilibria is difficult for Me III F 3 rich compositions due to the high vapour pressures p of GaF 3 , AlF 3 , and especially of the binary LiAlF 4 .…”