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

Vı́llora, Encarnación G.; Shimamura, Kiyoshi; Muramatsu, Keiichiro; Takekawa, Shunji; Kitamura, Kenji; Ichinose, Noboru

doi:10.1016/j.jcrysgro.2005.03.029

Cited by 18 publications

(14 citation statements)

References 8 publications

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“…This space group contains an inversion center and therefore ferroelectric properties in this compound are essentially forbidden. However, in some successful studies of ferroelectric properties of this host [4,5], in agreement with an early work [6] it was suggested that this compound belongs to the I4 space group without an inversion center. For the detailed description of these controversial points of view we refer to the publication [3].…”

Section: Introductionsupporting

confidence: 80%

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

Omelkov

Brik

Kirm

et al. 2011

J. Phys.: Condens. Matter

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Abstract. The present research is focused on the 4f-5d transitions in Ce 3+ centers doped into tetragonal β-SrAlF 5 single crystals belonging to I4 1 /a space group. The presence of 4 non-equivalent Sr 2+ sites in this compound leads to appearance of 3 spectroscopically non-equivalent Ce 3+ luminescence centers, which can be well distinguished using time-resolved laser spectroscopy technique. All 4f-5d transitions have slightly varying excitation and emission energies with the characteristic probabilities resulting in several decay times determined experimentally. One of these centers experiences strong perturbation due to a defect nearby, probably the O 2− impurity ion substituting F − ion and acting as charge compensator as well. Identification of these photoluminescence centers is performed using crystal field calculations. The crystal field parameters are calculated for two identified centers using the structural data for SrAlF 5 ; diagonalization of the crystal field Hamiltonian results in getting the splitting of the Ce 3+ 5d states. This method allowed assigning of "regular" unperturbed Ce 3+ centers with selected Sr 2+ sites.

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Section: Introductionsupporting

confidence: 80%

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

Omelkov

Brik

Kirm

et al. 2011

J. Phys.: Condens. Matter

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“…These authors confirmed the existence of a phase transition by observing anomalies in the dielectric constant and specific heat of polycrystalline samples at about 715 K. Supporting these results, Canouet et al [8] have also observed a phase transition at the same temperature in the crystal optical birefringence. Even though the experimental data supported the existence of a high temperature phase transition in SrAlF 5 , just in a recent work, Shimamura et al [9,10] reported for the first time direct evidence in favor of the ferroelectric character of SrAlF 5 presenting a polarization hysteresis loop in this material. However, these hysteresis loops do not exhibit the usual aspect of the ones of a normal ferroelectric compound since they are rounded shaped, maybe due to the presence of an electrical current component, and strongly dependent of the applied field.…”

Section: Introductionmentioning

confidence: 88%

About the Ferroelectricity of SrAlF₅

Silva¹,

Ayala²,

Moreira³

et al. 2006

Ferroelectrics

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SrAlF5 has been reported as one of the rare fluoride ferroelectric crystals, belonging to the polar I4 group. However, recent x-ray diffraction data suggest that the correct structure is centrosymmetric (I4 1 /a). Since ferroelectricity is forbidden in this structure, the existence of an inversion centre and the high temperature phase transition were investigated by vibrational and impedance spectroscopies. Thus, the optical phonons of SrAlF 5 single crystals were obtained by polarized Raman scattering and infrared reflectance spectroscopy. On the other hand, the high temperature phase transition was determined by frequency and temperature dependent measurements of the complex dielectric constant.

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“…6a, absolute values for ScF3 thermal conductivity within the observed For the crystalline ScF 3 , the refractive index was measured n D = 1.400(1) and its dispersion dependence was obtained in the visible region (see Figure 5b). Dependence n(λ) for some low-refractive fluoride crystals [46][47][48] are also provided in Figure 5b for the comparison purposes.…”

Section: Thermal Conductivity Measurementsmentioning

confidence: 99%

Growth from the Melt and Properties Investigation of ScF3 Single Crystals

et al. 2019

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ScF3 optical quality bulk crystals of the ReO3 structure type (space group P m 3 ¯ m , a = 4.01401(3) Å) have been grown from the melt by Bridgman technique, in fluorinating atmosphere for the first time. Aiming to substantially reduce vaporization losses during the growth process graphite crucibles were designed. The crystal quality, optical, mechanical, thermal and electrophysical properties were studied. Novel ScF3 crystals refer to the low-refractive-index (nD = 1.400(1)) optical materials with high transparency in the visible and IR spectral region up to 8.7 µm. The Vickers hardness of ScF3 (HV ~ 2.6 GPa) is substantially higher than that of CaF2 and LaF3 crystals. ScF3 crystals possess unique high thermal conductivity (k = 9.6 Wm−1К−1 at 300 K) and low ionic conductivity (σ = 4 × 10−8 Scm−1 at 673 К) cause to the structural defects in the fluorine sublattice.

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

Cited by 18 publications

References 8 publications

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

About the Ferroelectricity of SrAlF₅

Growth from the Melt and Properties Investigation of ScF3 Single Crystals

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

Cited by 18 publications

References 8 publications

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce3 +ions in SrAlF5crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce3 +ions in SrAlF5crystals

About the Ferroelectricity of SrAlF5

Growth from the Melt and Properties Investigation of ScF3 Single Crystals

Contact Info

Product

Resources

About

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

About the Ferroelectricity of SrAlF₅