Spectroscopic properties of Ho3+, Tm3+, and Ho3+/Tm3+ doped tellurite glasses for fiber laser applications

M. Seshadri; J. A. P. Ferencz Junior; Y. C. Ratnakaram; L. C. Barbosa

doi:10.1117/12.2036876

7 March 2014 Spectroscopic properties of Ho³⁺, Tm³⁺, and Ho³⁺/Tm³⁺ doped tellurite glasses for fiber laser applications

M. Seshadri, J. A. P. Ferencz Junior, Y. C. Ratnakaram, L. C. Barbosa

Proceedings Volume 8961, Fiber Lasers XI: Technology, Systems, and Applications; 896139 (2014) https://doi.org/10.1117/12.2036876
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

Several papers were reported on spectroscopic properties of rare earth doped different host glasses. A complete knowledge of fluorescence properties of rare earth ions in laser materials is necessary to achieve efficient, compact and cheap sources of laser radiation for NIR and mid-IR region. Tellurite glasses are potentially useful for generation of NIR and mid-IR laser radiation due to its special features such as lowest phonon energy (750 cm^-1) among oxide glasses, reasonably wide transmission region (0.35 - 5μm), good glass stability, good rare earth ion solubility, high linear and non-linear refractive index. In the present work, authors prepared Ho³⁺ and Tm³⁺ singly doped and Ho³⁺/Tm³⁺ co-doped tellurite glasses using conventional melt-quenching method. Spectroscopic measurements and analysis of energy transfer process in Ho³⁺, Tm³⁺ and Ho³⁺ /Tm³⁺ co-doped glasses pumped with 785nm and 451 nm excitation wavelengths have been performed. There are some spectroscopic properties which are important in understanding and modeling of rare earth doped laser materials. Using Judd-Ofelt theory, radiative transition rates (A_rad), radiative lifetimes (τ_R) and branching ratios (β) were estimated for certain excited states of Ho³⁺ and Tm³⁺ doped tellurite glasses. The emission cross-sections and gain coefficients have been determined from the absorption spectra of Ho³⁺ and Tm³⁺ ions in tellurite glasses. The energy transfer process such as ion cross-relaxation, Tm³⁺-Ho³⁺ energy transfer and energy transfer upconversion were studied and identified to specific candidate for laser operation.

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M. Seshadri, J. A. P. Ferencz Junior, Y. C. Ratnakaram, and L. C. Barbosa "Spectroscopic properties of Ho³⁺, Tm³⁺, and Ho³⁺/Tm³⁺ doped tellurite glasses for fiber laser applications", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896139 (7 March 2014); https://doi.org/10.1117/12.2036876

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