Chemically Etched Sharpened Tip of Transparent Crystallized Glass Fibers with Nonlinear Optical Ba2TiSi2O8 Nanocrystals

Abstract

Glass fibers with a diameter of Ĭ100 mm are drawn by just pulling up melts of 40BaOெ20TiO 2 ெ40SiO 2 glass, and transparent crystallized glass fibers consisting of nonlinear optical fresnoite Ba 2 TiSi 2 O 8 nanocrystals particle size: Ĭ100-200 nm are fabricated by crystallization of glass fibers. Precursor glass fibers and nanocrystallized glass fibers are etched chemically using a meniscus method, in which an etching solution of 0.1 wt!-HFhexane is used. Glass fibers with sharpened tips e.g., the taper length is ĬL 200 mm and the tip angle is Ĭu 23? are obtained. It is found that etched nanocrystallized glass fibers also have sharpened tips L 50 mm, u 80? . Compared with precursor glass fibers, nanocrystallized glass fibers show a high resistance against chemical etching in a 0.1 wt!HF solution. Although sharpened tips in nanocrystallized glass fibers do not have nanoscaled apertures, the present study suggests that nanocrystallized glass fibers showing second harmonic generations would have a potential for fiber-type light control optical devices.

Nucleation and Crystal Growth in Laser-Patterned Lines in Glasses

“…The results shown in Figures 1 and 2 propose that at least, at the laser irradiation condition of P = 0.8 W and S = 4 μm/s, only the crystal growth of β-BBO is taking place during the laser scanning in 8Sm2O3-42BaO-50B2O3 glass without causing any nucleation, and this would be one of the key points for the laser patterning of β-BBO crystals with high orientation. It should be pointed out that highly oriented Ba2TiSi2O8 crystal lines have been patterned by laser irradiation in 40BaO-20TiO2-40SiO2 glass, although Ba2TiSi2O8 nanocrystals are formed by heat treatment in an electric furnace (Enomoto et al, 2007;Honma et al, 2008a,b;Maruyama et al, 2008). Similar behaviors have been observed in the laser patterning and nano-scaled crystallization of the formation of nonlinear optical BaAlBO3F2 crystals in 50BaF2-25Al2O3-25B2O3 glass (Shinozaki et al, 2012).…”

Morphology and dispersion state of Ba2TiSi2O8 nanocrystals in transparent glass-ceramics and their nanoindentation behavior

“…The glass plates with polished surfaces were heat-treated at temperatures of 750, 760, 770, 780, and 790°C for 1 h in air and cooled to room temperature at a cooling rate of 1 K/min in an electric furnace. As demonstrated in the previous papers [8][9][10][11][12][13][14], the glass of 40BaO-20TiO 2 -40SiO 2 (mol%) shows the crystallization of fresnoite Ba 2 TiSi 2 O 8 nanocrystals (i.e., BTS nanocrystals) with diameters of 100 nm through a homogeneous nucleation. The XRD patterns at room temperature for some heat-treated samples prepared in this study are shown in Fig.…”

“…Although there have been many reports on the glass-ceramics containing BTS nanocrystals [5][6][7][8][9][10][11][12][13][14], information on the morphology and dispersion state of BTS nanocrystals is limited [20] heat-treated at 760°C for 1 h indicate the early stage of crystallization of fresnoite Ba 2 TiSi 2 O 8 in the glass of 40BaO-20TiO 2 -40SiO 2 . That is, even in the glass with the composition corresponding to the fresnoite Ba 2 TiSi 2 O 8 crystalline phase, not only bulk crystallization but also surface crystallization is taking place at the same time.…”

“…Glass-ceramics based on the BaO-TiO 2 -SiO 2 system have been extensively studied so far [5][6][7][8][9][10][11][12][13][14], because fresnoite Ba 2 TiSi 2 O 8 (designated here as BTS) crystals exhibit good dielectric and nonlinear optical properties. For instance, Enomoto et al [11] succeeded in fabricating transparent glass-ceramic fibers with BTS nanocrystals showing second harmonic generations (SHGs).…”

“…For instance, Enomoto et al [11] succeeded in fabricating transparent glass-ceramic fibers with BTS nanocrystals showing second harmonic generations (SHGs). Maruyama et al [13] reported the enhanced quantum yield of yellow luminescence of Dy 3+ ions incorporated into BTS nanocrystals formed in glasses.…”