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29 March 2011 Role of Yb3+ ions in the IR to visible upconversion of Er3+ ions in LTT glasses
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Proceedings Volume 7940, Oxide-based Materials and Devices II; 79400J (2011)
Event: SPIE OPTO, 2011, San Francisco, California, United States
In order to develop efficient visible upconversion lasers and optical fiber amplifiers, the detailed spectroscopic properties of singly doped Er3+ and codoped Er3+-Yb3+ ions in lead tungsten tellurite (LTT) glasses have been investigated. The glasses were prepared by the conventional melt quenching technique. Absorption, visible upconversion spectra and NIR emission spectra were recorded as a function of Yb3+ ions concentrations. Judd-Ofelt (J-O) analysis has been performed for the spectral intensities of Er3+and Er3+-Yb3+ absorption bands. Spontaneous emission probabilities (AR), radiative lifetimes (τR) and branching ratios (βR) were calculated by using the phenomenological Judd-Ofelt intensity parameters. Three strong upconversion emission bands centered at 526, 551 and 665 nm were observed under 980nm excitation, due to the energy transfer process from Yb3+ to Er3+ ions. The green emissions centered at 526 and 551 nm and the red emission at 665 nm are attributed to 2H11/24I15/2, 4S3/24I15/2 and 4F11/24I15/2 transitions of Er3+ions respectively. The relative intensity variations of 2H11/24I15/2, 4S3/24I15/2 and 4F9/24I15/2 transitions have been explained on the basis of the increase in the population accumulation rates of 2H11/2 ,4F9/2 and 4S3/2 levels. The peak stimulated emission cross-section (σe) and gain bandwidth parameter (σe×▵λeff) of 4I13/24I15/2 transition at 1.54 μm for Er3+ and Er3+-Yb3+ ions in LTT glasses have been determined and compared with different glass hosts. The stimulated emission cross-sections (σe) determined by using McCumber theory for the 4I13/24I15/2 transition are compared with the measured (σe) values obtained from the emission data. The results of these investigations revealed that the lead tungsten tellurite (LTT) glasses could be more useful as promising host materials for the design and development of optical fiber amplifiers and upconversion lasers.
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A. Mohan Babu, J. Suresh Kumar, B. C. Jamalaiah, Neeraj Kumar Giri, S.B. Rai, and L. Rama Moorthy "Role of Yb3+ ions in the IR to visible upconversion of Er3+ ions in LTT glasses", Proc. SPIE 7940, Oxide-based Materials and Devices II, 79400J (29 March 2011);

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