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Detailed Program
Paper Number : GL-O03
Time Frame : 11:34~11:46
Presentation Date : Thurse day, 27, November
Session Name : Glass & Optp-Electonic Materials
Session Chair 1# : Yong Gyu Choi
Session Chair 2# : Atsunobu Masuno
Recent Progress in Laser Patterning of Functional Crystals with High Orientation in Glasses
Takayuki KOMATSU
Nagaoka University of Technology
Laser irradiation to glass has been regarded as a process for spatially selected structural modification and/or crystallization in glass, and the laser-induced crystallization method, especially driven by thermal mechanisms, has been applied to pattern optical active crystals [1-3]. In the laser-induced crystallization, only spatially limited region is heated locally. This provides two important points for the crystallization mechanism of glasses: 1) the probability of nucleation in the spatially selected small region during laser irradiations would be very small, 2) a steep temperature gradient is created in the laser irradiated region and such a temperature gradient is moved along laser scanning direction. In particular, the generation and moving of steep temperature gradient would be one of the key points for the laser patterning of crystals with high orientations. In the presentation, we describe the recent progress in the laser pattering of functional crystals with high orientations in glasses.
For instance, -BBO crystals with dot, line, and planar two-dimensional morphologies are patterned in Sm2O3-BaO-B2O3 glasses by just scanning continuous wave lasers such as Yb:YVO4 fiber lasers (wavelength: 1080 nm). In the patterning of -BBO crystals in the inside of glass fibers (diameter: 450 m), the focal position of Yb:YVO4 lasers (e.g., power: 0.9~1.0 W, scanning speed: 2 m/s) was moved from the surface to the inside. It was confirmed that -BBO crystals patterned are highly oriented, i.e., c-axis orientation, along the laser scanning direction. The curved and bending -BBO crystal lines were also patterned by just changing the laser scanning direction (Figs. 1 and 2).











Figure 1 Polarized optical microscope photograph Figure 2 Curved -BBO line patterned
of the bending -BBO line by laser-induced crystallization

References:
[1] K. Shinozaki, T. Honma, and T. Komatsu, J. Appl. Phys. 112 (2012) 093506
[2] T. Komatsu and T. Honma, J. Asian Ceram. Soc. 1 (2013) 9.
[3] K. Ogawa, T. Honma, and T. Komatsu, J. Solid State Chem. 207 (2013) 6.
Acknowledgements :