Applications of Random Nonlinear Photonic Crystals Based on Strontium Tetraborate

Aleksandrovsky, A.S.; Vyunishev, A. M.; Зайцев, А. И.

doi:10.3390/cryst2041393

Cited by 14 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Twinned structures of SBO crystals were reported by Aleksandrovsky et al, for the first time. 20,21 They succeeded in growing partially twinned SBO crystals by the Czochralski method (CZ method). To control the formation of twin boundaries, the incorporation of defects is further required, which can be achieved by the periodic application of an electric field during the growth under a high-temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method

Inaba

Ishibashi

Asakawa

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

SrB 4 O 7 (SBO) has received much attention as a solid-state ultraviolet laser crystal for a wide variety of applications such as micromachining and spectroscopy. Here we demonstrate the effects of electric fields E on the growth of SBO crystals along the b axis by the μ-pulling-down method to fabricate SBO with periodic twins, which increases the conversion light intensity. During the growth, the direction of electric fields was alternated for 30 min periods. The crystal fibers were evaluated by polarized optical microscopy, X-ray diffraction, and transmission electron microscopy. Without an external voltage, single SBO crystals grew. In contrast, at E ≥ 400 V/cm needles of SrB 2 O 4 appeared inside SBO fibers. At E ≥ 1000 V/cm, new domains of SBO grew from the seed crystals, and interestingly, growth twins were formed perpendicular to growth fronts. Thus, we found that the growth of SBO by the μ-PD method via alternating the application of opposing electric fields exhibits two mechanisms. In contrast, when the electrodes in melt and growth fronts switched to + and −, respectively, growth fronts changed from concave into convex shapes, irrespective of E. We could explain the relation between the two mechanisms and the inversion of surface shapes, using the convection.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method

Inaba

Ishibashi

Asakawa

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

show abstract

“…Among the most attractive features of borate crystals such key characteristics as their transparency in deep UV range, high optical damage threshold combined with appropriate nonlinearity, and suitable chemical stability of optical surface should be pointed, and they define wide applications of borate materials in modern laser optics and nanophotonics [1][2][3][4][5][6][7][8][9][10][11]. Within borate matrices, boron ions can be either three-or four-fold coordinated, and the combination of BO4 and BO3 units produces large variety of crystal structures with differing properties [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic properties of new noncentrosymmetric self-activated borate Rb3EuB6O12 with B5O10 units

et al. 2018

View full text Add to dashboard Cite

New noncentrosymmetric double borate Rb3EuB6O12 was synthesized by solid state reaction method, and their crystallographic parameters were obtained by Rietveld analysis. This borate crystallizes in the trigonal space group R32 with cell parameters of a = 13.4604(2) Å, c = 30.7981(5) Å, Z = 15. Their structure features a three-dimensional framework composed of [B5O10] 5groups that are bridged by Eu-O polyhedra. The existence of B5O10 group in the structure was confirmed by vibrational spectroscopy. Rb3EuB6O12 melts incongruently at 1101 K. The second harmonic generation effect of Rb3EuB6O12 is 16 times higher than that of α-quartz standard. In the luminescence spectrum, the domination of a single prominent narrow line from hypersensitive 5 D0-7 F2 manifold of Eu 3+ ions is observed, while 5 D0-7 F1 manifold and ultranarrow 5 D0-7 F0 line are of comparable peak intensity. These features are explained by specific local symmetry of Eu ion within the crystal structure of Rb3EuB6O12..

show abstract

“…However, since borates are non-ferroelectric crystals, with the utilization of the poling method and the hot-pressing method it is difficult to control twin boundary orientation. Aleksandrovsky et al, for the first time, reported twinned structures of SBO crystals [17,18]. They succeeded in growing partially twinned SBO crystals by the Czochralski method (CZ).…”

Section: Introductionmentioning

confidence: 99%

Growth of SrB4O7 Crystal Fibers along the c-Axis by Micro-Pulling-Down Method

2021

View full text Add to dashboard Cite

SrB4O7 (SBO) receives much attention as solid-state ultraviolet lasers for micro-machining, photochemical synthesis, and laser spectroscopy. For the application of SBO, the SBO crystals require the control of twinning to amplify the conversion light. We also expected that the inhibitation of the SrB2O4 appearance was essential. Here, we show the growth of SBO crystals along the c-axis through the micro-pulling-down method while alternating the application of electric fields (E). Without the application, single crystals were grown. At E ≧ 400 V/cm no needle domains of SrB2O4 inside SBO crystals existed; however, composition planes were formed and twin boundaries did not appear. In contrast, the inversion of surface morphology emerged, and the convex size was especially large at 1000 V/cm. These results demonstrate that convection is generated perpendicular to the growth front by alternating the application of electric fields. This surface morphological change contradicts the conventional concept of growth through the micro-pulling-down method. The distance from seed crystals vs. grain density plot also showed that the density did not decrease with a sufficient slope. Consequently, we concluded that the selection of the c-axis as growth faces is not fruitful to fabricate twins, and the selection of the growth condition, under which geometrical selection strongly affects, is the key.

show abstract

Applications of Random Nonlinear Photonic Crystals Based on Strontium Tetraborate

Cited by 14 publications

References 24 publications

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method

Structural and spectroscopic properties of new noncentrosymmetric self-activated borate Rb3EuB6O12 with B5O10 units

Growth of SrB4O7 Crystal Fibers along the c-Axis by Micro-Pulling-Down Method

Contact Info

Product

Resources

About

Applications of Random Nonlinear Photonic Crystals Based on Strontium Tetraborate

Cited by 14 publications

References 24 publications

Effects of the Application of Electric Fields on the Growth of SrB4O7 Crystals by the Micro-Pulling-Down Method

Effects of the Application of Electric Fields on the Growth of SrB4O7 Crystals by the Micro-Pulling-Down Method

Structural and spectroscopic properties of new noncentrosymmetric self-activated borate Rb3EuB6O12 with B5O10 units

Growth of SrB4O7 Crystal Fibers along the c-Axis by Micro-Pulling-Down Method

Contact Info

Product

Resources

About

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method

Effects of the Application of Electric Fields on the Growth of SrB₄O₇ Crystals by the Micro-Pulling-Down Method