Spectroscopy of thulium and holmium heavily doped tellurite glasses

• Published in: Journal of luminescence 2012-02, Vol.132 (2), p.270-276
• Main Authors: Gebavi, H., Milanese, D., Balda, R., Taccheo, S., Fernandez, J., Lousteau, J., Ferraris, M.
• Format: Article
• Language: English
• Subjects: Amorphous materials, glasses and other disordered solids; Coefficients; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diffusion; Diode lasers; Energy transfer; Exact sciences and technology; Glass; Holmium; Lasers; Mathematical analysis; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Spectroscopy; Tellurite glass; Thermal properties; Thulium
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2011.08.042

In this study, we report spectroscopic properties of Tm 3+ and Ho 3+ codoped tellurite glasses over a wide dopant concentration range in order to assess their potential laser performance under 790 nm diode laser excitation. The impact of Tm 3+ and Ho 3+ concentrations is investigated to identify specific candidates for fiber laser operation. The emission cross section is calculated and discussed, as well as the gain coefficient of this type of glasses. Energy transfer microparameters and critical ion distances are determined for 3H 4, 3F 4 (Tm 3+), and 5I 7 (Ho 3+) emission levels in the framework of diffusion-limited regime and dipole–dipole interaction. We also report thermal properties of tested glasses. ► Energy transfer parameters are calculated using the S–A spectra overlap. ► Most suitable candidate for short cavity fiber laser application determined. ► Radiative Ho 3+ ( 5I 7) lifetime value of 6.57 ms is obtained.