Radiative trapping effect of Yb3+ ions in lead-germanate glasses
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Yb3+ is a good candidate as a pump source because there are only two manifolds in the Yb3+ energy level scheme, the 2F7/2 ground state and the 2F5/2 excited state, and thus concentration quenching and excited-state absorption should not affect the lasing or the excitation wavelength . Extensive investigations have been of Yb3+-doped glasses, fibers, and crystals [2, 3, 4, 5]. The relatively long fluorescence lifetime, as well as the broad absorption and emission bands, is more prominent for Yb-doped glasses than for crystals, making the glasses attractive for diode-pumped generation of ultra-short pulses, high-power ultra-short pulse amplification and tunable laser sources . In addition, the ability to achieve high concentrations of Yb3+ ions and low loss also triggered the rapid development of various Yb3+-doped glasses such as phosphate, borate, and silicate glasses. However, up to now, there are few systematic investigations of the optical properties of Yb3+-doped germanate...
KeywordsFluorescence Lifetime Emission Cross Section Radiative Decay Rate Radiative Trapping Reciprocity Method
The authors would like to give thanks to Dr. S. Dai for his helpful discussions. This work is supported by the National Natural Foundation of China (Project No. 60307004 and 50472053), DSTG (Guangzhou 2004Z2-0131), Program for New Century Excellent Talents in University (Grant No. NCET-04-0821) and the open foundation of the Key Laboratory of Silicate Materials Science and Engineering (Wuhan University of Technology) of Ministry of Education (Grant No. SYSJJ2004-04).