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31 October 2005 Spectroscopy of Tm-Ho co-doped tellurite glass for mid-IR fibre lasers in 1.8-2.2 μm
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The paper discusses the application of Tm3+ and Tm3+/Ho3+-co-doped tellurium oxide fibres for LIDAR applications. Suitably co-doped tellurium oxide glass offers an excellent opportunity for developing high-power tunable laser compact devices, using both the 800 nm, 980 nm, and 1480 nm pumping schemes. Rare-earth ions have large solubility in tellurite glass, which we aim to exploit for designing Tm3+ and Tm3+/Ho3+ lasers operating in the 1.8μm and 2.9μm ranges. The importance of this wavelength band in characterising atmospheric CO2 and OH measurements will be explained, using the following transitions in Tm3+:3F4 - 3H6 (1.8 μm), 3H4 - 3H5 (2.3 μm) and in Ho3+: 5I7 - 5I8 (2.1 μm) and 5I6 - 5I7 (2.9 μm), all of which can be achieved via the pumping schemes at above wavelengths. The paper discusses the spectroscopic characterisations of bulk glass and their applications in the design of single-mode fibres for laser experiments. For 980 nm pumping scheme, the efficient energy transfer via Yb3+-ion co-doping to the respective lasing levels in Tm3+ and Ho3+ is explained. The results from the steady state fluorescence spectroscopy measurements for the energy transfer analysis are explained for laser design. The paper also explains the fibre pumping scheme and laser experiments in the 1.8 μm and 2.05 μm region.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Billy D. O. Richards, Shaoxiong Shen, and Animesh Jha "Spectroscopy of Tm-Ho co-doped tellurite glass for mid-IR fibre lasers in 1.8-2.2 μm", Proc. SPIE 5984, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing, 598407 (31 October 2005);

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