Abstract Er$^{3+}$- and Er$^{3+}$/Yb$^{3+}$-doped lead germanate glasses that are suitable for use in fibre lasers and optical amplifiers as well as optical waveguide devices have been fabricated and characterized. The absorption spectra from near-infrared to visible were obtained and the Judd－Ofelt parameters were determined from the absorption band. Intense and broad 1.53μm infrared fluorescence and visible upconversion luminescence were observed under 976 nm diode laser excitation. For 1.53μm emission band, the full widths at half-maximum are 36, 37, 51 nm for GPE, GPYE and GPFE samples, respectively. For frequency upconversion emission, the intense bands centred at around 524, 545, 657nm are due to the $^4$S$_{3/2}$+$^2$H$_{11/2}$→$^4$I$_{15/2}$ and $^4$F$_{9/2}$→$^4$I$_{15/2}$ transitions of Er$^{3+}$ ions. The quadratic dependence of the green and red emissions on excitation power indicates that the two-photon absorption process occurs under the 976nm excitation.
Received: 30 June 2003
Revised: 18 August 2003
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundations of China (Grant Nos 60307004 and 60207006) and the Fund of Optical Science and Technology of Shanghai (Grant No 022261046).
Cite this article:
Yang Zhong-Min (杨中民), Xu Shi-Qing (徐时清), Hu Li-Li (胡丽丽), Jiang Zhong-Hong (姜中宏) Optical transitions in Er3+ doped lead germanate glasses 2004 Chinese Physics 13 401
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