Space-selective precipitation of Ge crystalline patterns in glasses by femtosecond laser irradiation.
Crystalline Ge was induced space selectively inside a borosilicate glass by 800 nm, 250 kHz femtosecond laser irradiation. Micro-Raman spectra and x-ray diffraction analysis confirmed that the laser-induced crystals were cubic Ge. A periodic structure consisting of Ge crystalline lines was inscribed in the glass sample by continuously moving the focal point of the laser beam. Large third-order nonlinear optical properties and ultrafast response time were observed from the crystallization region owing to highly optical nonlinearity of Ge crystals. These results may find some applications in fabrication of functional optical and photonic devices, such as optical circuits.
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Geng
G
Lin
Fangfang
F
Luo
Fei
F
He
Yu
Y
Teng
Wenjiang
W
Tan
Jinhai
J
Si
Danping
D
Chen
Jianrong
J
Qiu
Quanzhong
Q
Zhao
Zhizhan
Z
Xu