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

Published online by Cambridge University Press:  31 January 2011

Tsuyoshi Honma*
Affiliation:
Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka 940-2188, Japan
Takayuki Komatsu
Affiliation:
Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka 940-2188, Japan
Yasuhiko Benino
Affiliation:
Department of Material and Energy Science, Graduate School of Environmental Science, Okayama University, Okayama 700-8530, Japan
*
a)Address all correspondence to this author. e-mail: honma@mst.nagaokaut.ac.jp
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Abstract

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–16.7TiO2–50SiO2 or –50GeO2 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 d31/d33 ratio is found to be ∼23 for Ba2TiSi2O8 (BTS) crystal lines, and ∼13 for Ba2TiGe2O8 (BTG) crystal lines, where d31 and d33 are the principal d tensors for the second-order optical nonlinearity of fresnoite-type crystals.

Type
Rapid Communications
Copyright
Copyright © Materials Research Society 2008

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References

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