Abstract
The spatial distributions of elements in a glass can be modulated by irradiation with high repetition rate femtosecond laser pulses. However, the shape of the distribution is restricted to being axially symmetric about the laser beam axis due to the isotropic diffusion of photo-thermal energy. In this study, we describe a method to control the shape of the elemental distribution more flexibly by simultaneous irradiation at multiple spots using a spatial light modulator. The accumulation of thermal energy was induced by focusing 250 kHz fs laser pulses at a single spot inside an alumino–borosilicate glass, and the transient temperature distribution was modulated by focusing 1 kHz laser pulses at four spots in the same glass. The resulting modification was square-shaped. A simulation of the mean diffusion length of molten glass demonstrated that the transient diffusion of elements under heat accumulation and repeated temperature elevation at multiple spots caused the square shape of the distribution.
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Masaaki Sakakura, Kouhei Yoshimura, Torataro Kurita, Masahiro Shimizu, Yasuhiko Shimotsuma, Naoaki Fukuda, Kazuyuki Hirao, and Kiyotaka Miura
Opt. Express 22(13) 16493-16503 (2014)
Masahiro Shimizu, Masaaki Sakakura, Shingo Kanehira, Masayuki Nishi, Yasuhiko Shimotsuma, Kazuyuki Hirao, and Kiyotaka Miura
Opt. Lett. 36(11) 2161-2163 (2011)
Yin Liu, Masahiro Shimizu, Bin Zhu, Ye Dai, Bin Qian, Jianrong Qiu, Yasuhiko Shimotsuma, Kiyokata Miura, and Kazuyuki Hirao
Opt. Lett. 34(2) 136-138 (2009)