Formation of Infrared Femtosecond Laser Induced Colour Centers
in Tb3+-Doped and Tb3+/Ce3+-Codoped Heavy Germanate Glasses
CHEN Guo-Rong1,3, YANG Yun-Xia1, QIU Jian-Rong2, JIANG Xiong-Wei2, K. Hirao3
1Department of Inorganic Materials, East China University of Science and Technology, Shanghai 200237
2Photon Craft Project, Japan Science and Technology Corporation, Keihanna Plaza, Kyoto 619-0237, Japan
3Division of Material Chemistry, Faculty of Engineering, Kyoto University, Sakyo, Kyoto, 606-8501, Japan
Formation of Infrared Femtosecond Laser Induced Colour Centers
in Tb3+-Doped and Tb3+/Ce3+-Codoped Heavy Germanate Glasses
1Department of Inorganic Materials, East China University of Science and Technology, Shanghai 200237
2Photon Craft Project, Japan Science and Technology Corporation, Keihanna Plaza, Kyoto 619-0237, Japan
3Division of Material Chemistry, Faculty of Engineering, Kyoto University, Sakyo, Kyoto, 606-8501, Japan
Abstract： Formation of infrared femtosecond laser induced colour centers was observed in the Tb3+-doped and Tb3+/Ce3+-codoped heavy germanate glasses. A rectangle scanning was made by focusing the laser beam inside the glass samples. A three-dimensional yellowish block was created from the path and it corresponded to the appearance of broad absorption bands in the absorption spectra. Irradiation induced absorption coefficient μ (λ) was used to characterize the distribution of radiation induced colour centers in the samples, whose peak was located at 380 nm and extended to the longer wavelength. Ce3+ ions were found not only to inhibit the formation of colour centers, but also to enhance the recovery.
2003, Vol. 20 
