Faculty Profiles - BENINO Yasuhiko

Papers - BENINO Yasuhiko

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Comprehensive study of crystallization and phase formation in (La,Gd)BGeO5 glass Reviewed

Y. Takahashi, Y. Benino, T. Fujiwara and T. Komatsu

J. Ceram. Soc. Jpn. 116 ( 10 ) 1108 - 1114 2008.10

Writing of crystal lines and its optical properties of rare-earth ion (Er3+ and SM3+) doped lithium niobate crystal on glass surface formed by laser irradiation Reviewed

Tsuyoshi Honma, Keiko Koshiba, Yasuhiko Benino, Takayuki Komatsu

OPTICAL MATERIALS 31 ( 2 ) 315 - 319 2008.10

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

A glass of Li2O-Nb2O5-SiO2-B2O3 with an addition of CuO or Sm2O3 crystallizing in nonlinear optical lithium niobate LiNbO3 is developed. Crystalline lines of Lithium Niobate have been fabricated by continuous wave laser irradiation of the glass surface. The crystalline laser written lines have been found, by means of micro-Raman and Second Harmonic experiments, to be well oriented with its c-axis pointing along the laser scanning direction. The analysis of the confocal micro luminescence spectra obtained at the crystalline line have confirmed the incorporation of rare-earth ions in the crystalline network. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.optmat.2008.04.015

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Microfabrication of U-shaped grooves on the surface of BaO-TiO2-GeO2 glass by YAG laser irradiation and selective chemical etching

N. Hirokawa, T. Honma, T. Komatsu and *Y. Benino

J. Am. Ceram. Soc. 91 ( 7 ) 2170 - 2175 2008.7

Second-order optical non-linearity initiated in Li2O-Nb2O5-SiO2 and Li2O-ZnO-Nb2O5-SiO2 glasses by formation of polar and centrosymmetric nanostructures Reviewed

V.N. Sigaev, N.V. Golubev, S.Yu. Stefanovich, T. Komatsu, *Y. Benino, P. Pernice, A. Arone, E. Fanelli, B. Champagnon, V. Califano, D. Vouagner, T.E. Konstantinova and V.A. Glazunova

J. Non-Cryst. Solids 354 ( 10-11 ) 873 - 881 2008.4

Patterning of c-axis-oriented Ba2TiX2O8 (X = Si, Ge) crystal lines in glass by laser irradiation and their second-order optical nonlinearities Reviewed

Tsuyoshi Honma, Takayuki Komatsu, Yasuhiko Benino

JOURNAL OF MATERIALS RESEARCH 23 ( 4 ) 885 - 888 2008.4

Language：English Publishing type：Research paper (scientific journal) Publisher：MATERIALS RESEARCH SOC

Crystal lines consisting of nonlinear optical fresnoite-type Ba2TiX2O8 (X = Si, Ge) crystals are patterned on the surface of CuO (1 mol%)-doped 33.3BaO-16.7TiO(2)- 50SiO(2) or -50GeO(2) glasses by continuous-wave (cw) neodymium:yttrium aluminum garnet (Nd:YAG) laser (wavelength 1064 nm) irradiation. It is confirmed from polarized micro-Raman scattering spectra that the c axis of Ba2TiX2O8 crystals in the lines are oriented along the laser-scanning direction (i.e., parallel to the lines). The azimuthal dependences of second-harmonic (SH) intensities for the crystal lines indicate unique fringe patterns, and the c-axis orientation of the crystals is supported from the analyses of fringe patterns. The value of the d(31)/d(33) ratio is found to be similar to 23 for Ba2TiSi2O8 (BTS) crystal lines, and similar to 13 for Ba2TiGe2O8 (BTG) crystal lines, where d(31) and d(33) are the principal d tensors for the second-order optical nonlinearity of fresnoite-type crystals.

DOI： 10.1557/JMR.2008.0135

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Transparent nonlinear optical crystallized glass fibers with highly oriented Ba2TiGeO8 crystals Reviewed

Y. Hane, T. Komatsu, *Y. Benino and T. Fujiwara

J. Appl. Phys. 103 ( 6 ) 063512-1 - 063512-7 2008.3

Writing of crystal line patterns in glass by laser irradiation Reviewed

Tsuyoshi Honma, Rie Ihara, Yasuhiko Benino, Ryuji Sato, Takumi Fujiwara, Takayuki Komatsu

Journal of Non-Crystalline Solids 354 ( 43140 ) 468 - 471 2008.1

Creation of ferroelectric, single-crystal architecture in Sm0.5La0.5BGeO5 glass Reviewed

P. Gupta, H. Jain, D.B. Williams, T. Honma, *Y. Benino and T. Komatsu

J. Am. Ceram. Soc. 91 ( 1 ) 110 - 114 2008.1

一般廃棄物高温焼却炉用クロムフリー耐火物の開発

伊賀棒公一, 崎田真一, 紅野安彦, 難波徳郎, 藤田基成, 山口明良

耐火物 60 ( 3 ) 2008

Patterning of ferroelectric b'-Gd2(MoO4)3 crystal lines on the glass surface by transition metal atom heat processing Reviewed

R. Nakajima, T. Honma, *Y. Benino and T. Komatsu

J. Ceram. Soc. Jpn. 115 ( 10 ) 582 - 587 2007.10

Line patterning of (Sr,Ba)Nb2O6 crystals in borate glasses by transition metal atom heat processing

M. Sato, T. Honma, *Y. Benino and T. Komatsu

J. Solid Stat. Chem. 180 (9), 2541-2549 2007.9

Formation of LiNbO3 crystals at the surface of TeO2-based glass by YAG laser-induced crystallization

H. Sugita, T. Honma, *Y. Benino and T. Komatsu

Solid Stat. Commun. 143 (6-7), 280-284 2007.8

Structure and non-linear optical properties of BaO-TiO2-SiO2 glass containing Ba2TiSi2O8 crysta

H. Masai, S. Tsuji, T. Fujiwara, *Y. Benino and T. Komatsu

J. Non-Cryst. Solids 353 (22-23), 2258-2262 2007.7

Patterning and morphology of nonlinear optical GdxBi1-xBO3 crystals in CuO-doped glass by YAG laser irradiation Reviewed

K. Koshiba, T. Honma, *Y. Benino and T. Komatsu

Appl. Phys. A 89 981 - 986 2007.7

Dual layered surface crystallization of 30BaO-15TiO(2)-55GeO(2) glass by stepwise heat treatment Reviewed

Hirokazu Masai, Takumi Fujiwara, Hiroshi Mori, Yasuhiko Benino, Takayuki Komatsu

JOURNAL OF APPLIED PHYSICS 101 ( 12 ) 123505 2007.6

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

In the crystallization process of 30BaO-15TiO(2)-55GeO(2) (BTG55), we demonstrated by an x-ray diffraction analysis that a stepwise heat treatment enables a selective crystallization of fresnoite and benitoite, two crystalline phases obtained from the BTG55 mother glass and that these two phases form a dual surface layer. The result indicates that the stepwise heat treatment generates a compositional heterogeneity inside the glass matrix, which facilitates the nucleation of the fresnoite phase. The mechanism for the generation of the dual surface layer is discussed. Due to a marked difference in optical nonlinearity of the two phases, the selective crystallization may open the possibility of an optimized heat-treatment condition to achieve a large optical nonlinearity in crystallized glass. Also, two types of fresnoite, tetragonal and orthorhombic, were observed in the crystallized phase after a stepwise heat treatment of 690/720 degrees C. (c) 2007 American Institute of Physics.

DOI： 10.1063/1.2743827

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

Enomoto Itaru, Benino Yasuhiko, Fujiwara Takumi, Komatsu Takayuki

115 ( 1342 ) 374 - 378 2007.6

Chemically etched sharpened tip of transparent crystallized glass fibers with Nonlinear optical Ba2TiSi2O8 nanocrystals Reviewed

Itaru Enomoto, Yasuhiko Benino, Takurni Fujiwara, Takayuki Komatsu

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 115 ( 1342 ) 374 - 378 2007.6

Language：English Publishing type：Research paper (scientific journal) Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

Glass fibers with a diameter of similar to 100 mu m are drawn by just pulling up melts of 40BaO center dot 20TiO(2)center dot 40SiO(2) glass, and transparent crystallized glass fibers consisting of nonlinear optical fresnoite Ba2TiSi2O8 nanocrystals (particle size: similar to 100-200 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%-HF/hexane is used. Glass fibers with sharpened tips (e.g., the taper length is similar to L = 200,mu m and the tip angle is similar to theta = 23 degrees) are obtained. It is found that etched nanocrystallized glass fibers also have sharpened tips (L = 50 mu m, theta = 80 degrees). 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.

DOI： 10.2109/jcersj.115.374

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Creation of locally selective mirror surface on 40BaO-40TiO2-20B2O3 glass by XeCl pulse laser irradiation

H. Masai, S. Mizuno, T. Fujiwara, *Y. Benino, T. Komatsu, H. Mori

J. Mater. Res. 22 (5), 1270-1274 2007.5

Glass-ceramics with LiFePO4 crystals and crystal line patterning in glass by YAG laser irradiation

K. Hirose, T. Honma, *Y. Benino and T. Komatsu

Solid. Stat. Ionics 178 (11-12), 801-807 2007.5

Patterning of non-linear optical crystals in glass by laser-induced crystallization Reviewed

T. Komatsu, R. Ihara, T. Honma, Y. Benino, R. Sato, H. G. Kim, T. Fujiwara

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 90 ( 3 ) 699 - 705 2007.3

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

This paper reports recent progress in the patterning of non-linear optical crystals on the glass surface by laser irradiation. Two techniques for the writing of crystal lines have been developed, i.e., rare-earth (samarium) atom heat processing and transition metal atom heat processing, in which a continuous wave Nd:YAG laser (wavelength: lambda=1064 nm) is irradiated to the glasses containing rare-earth (RE: Sm3+, Dy3+) ions or transition metal (TM: Ni2+, Fe2+, V4+) ions. The writing of crystal lines such as beta-BaB2O4, SmxBi1-xBO3, and Ba2TiGe2O8 showing second harmonic generations has been successful. It is clarified from the azimuthal dependence of second harmonic intensity and polarized micro-Raman scattering spectra that crystal lines consist of highly oriented crystals along the crystal line growth direction. It is also possible to write two-dimensional crystal bending or curved lines by just changing the laser scanning direction. The mechanism of the laser-induced crystallization has been proposed.

DOI： 10.1111/j.1551-2916.2006.01441.x

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