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Journal of Applied Physics 南开大学宋峰老师论文.pdf

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Journal of Applied Physics 南开大学宋峰老师论文

JOURNAL OF APPLIED PHYSICS 107, 033110 2010 Intense 1.54 m ﬂuorescence of Er3+/Yb3+ codoped phosphate glass and the three-photon phenomenon of near infrared upconversion luminescence Lanjun Luo, Feng Song,a Xiaochen Yu, Wentao Wang, Chengguo Ming, Lin Han, Yin Yu, Hao Wu, and Jianguo Tian Photonics Center, College of Physical Science, Nankai University, Tianjin 300071, People’s Republic of China The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin 300457, People’s Republic of China Received 3 July 2009; accepted 17 December 2009; published online 9 February 2010 Transparent P O –CaO–Na O glasses codoped with Er3+ and Yb3+ ions were fabricated by 2 5 2 high-temperature melting technique. Strong near infrared and visible upconversion luminescence were observed under 975 nm laser diode excitation, and the luminescence processes were explained −20 2 in details. For 1.54 m band, the calculated peak emission cross sections is 1.04 10 cm , and it is better than that in germinate, tellurite, silicate, and other phosphate glasses. The near infrared upconversion emission around 828 nm contains two-photon and three-photon processes, and it is 4 4 attributed to the transition S3/2 → I 13/2, which enhances the popu