The new nonlinear optical crystal Y
x
La
y
Sc
z
(BO3)4 (x + y + z = 4) has been discovered. Phase boundaries
have been established in the determination of the x, y, z composition parameters that define the existence
region of the trigonal huntite-type structure. From single-crystal X-ray diffraction measurements, the
member Y0.57La0.72Sc2.71(BO3)4 has been found to crystallize in space group R32 with cell dimensions a
= 9.774(1) and c = 7.944(3) Å. Large single crystals have been grown by a high-temperature solution
method. The high-energy optical absorption edge for polished pieces was found to be at a wavelength
shorter than 200 nm. Sellmeier equations for the dispersion in the refractive indices were determined on
the basis of curve fitting of data obtained by the method of minimum deviation. From modeling and
optical measurements on powders, the nonlinear optical coefficient d
11 has been determined to be 1.4
pm/V.
Zinc tellurite glasses appear to be excellent candidates for hosting rare earth ions since they provide a low phonon energy environment to minimize non-radiative losses as well as possess good chemical durability and optical properties. The optical behavior of the rare earth ion can be manipulated by modifying its local environment in the glass host. We report measurements of the emission lifetime, optical absorption, and vibrational density of states of the glass system (ZnO),(ZnF2),(Te02),~x~y doped (0.1 mol%) with a series of rare earths. Phonon sideband spectroscopy has been successfully employed to probe vibrational structure in the immediate vicinity of the rare earth ion. We observe a significant increase in the emission lifetime (from approximately 150 ps to 250 ps) of Nd3+ with increasing fluorine substitution.
= 4). -Large single crystals of approximate composition Y0.57La0.72Sc2.71(BO3)4 are prepared from mixtures of Y2O3, La2O3, Sc2O3, B2O3, and Li2O using 3Li2O·2B2O3 as flux (1050°C, 2 d). The compound crystallizes in the trigonal space group R32 with Z = 3. Measurements of the optical properties indicate a wide transparency range extending into the deep UV, a moderate birefringence, and a high second-order susceptibility coefficient. These features make the compound a promising nonlinear optical material for practical applications. -(YE, N.; STONE-SUNDBERG, J. L.; HRUSCHKA, M. A.; AKA, G.; KONG, W.; KESZLER*, D. A.; Chem. Mater. 17 (2005) 10, 2687-2692; Dep. Chem., Oreg. State Univ., Corvallis, OR 97331, USA; Eng.) -W. Pewestorf 30-014
We have investigated the structural and optical properties of rare earth-doped zinc tellurite glasses modified by the substitution of ZnF2. Raman and phonon sideband spectroscopies were employed to characterize changes in the glass structure as well as to probe vibrational behavior in the immediate vicinity of the rare earth ion. These measurements are combined with photoluminescence and optical absorption to monitor the effect of halide substitution upon the optical behavior of the rare earth dopant. A substantial increase in the intrinsic radiative lifetime of Nd3+ is observed with increasing halide concentration.
As part of an ongoing investigation to characterize the properties and structure of zinc halide-tellurium oxide glasses, we report preliminary measurements of the optical properties of several Nd- and Er-doped tellurites. Measurements include florescence lifetimes and estimates of the theoretical radiative lifetimes (as obtained by traditional Judd-Ofelt analysis of optical absorption spectra) as well as phonon sideband studies sensitive to vibrational characteristics near the rare earth ion. The response of these optical features to the substitution of alternative halides is examined.
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