Absorption Spectra Comparison of Tm/Ho-Codoped Bototellurite Glasses

Abstract

<p>This paper presents a comparison study of absorption spectra of borotellurite glasses with compostion: 20TeO<sub>2</sub> – 15Bi<sub>2</sub>O<sub>3</sub> – 3TiO<sub>2</sub> – (4-x) Na<sub>2</sub>CO<sub>3</sub> – 1Tm<sub>2</sub>O<sub>3</sub> - xHo<sub>2</sub>O<sub>3</sub> where x = 0; 0.5; 1; 1.5; 2; 2.5 (mol%). All glasses are fabricated using melt quenching method. Absorption spectra were recorded at room temperature in the spectral range of 200 – 1100 nm. Within this range, glass with x = 0 mol % of Ho<sub>2</sub>O<sub>3</sub> shows 2 absorption peaks which corresponds to electronics transition from <sup>3</sup>H<sub>6</sub> to state to <sup>3</sup>F<sub>3</sub> and <sup>3</sup>H<sub>4</sub>. For x = 0.5; 1; 1.5; 2; 2.5 (mol%), nine absorption peaks corresponding to electronics transition from <sup>3</sup>H<sub>6</sub> to state to <sup>5</sup>G<sub>5</sub>, <sup>5</sup>G<sub>6</sub>, <sup>1</sup>G<sub>4</sub>, <sup>1</sup>G<sub>4</sub>, <sup>5</sup>F<sub>3</sub>, <sup>5</sup>F<sub>4</sub>, <sup>5</sup>F<sub>5</sub>, <sup>3</sup>F<sub>3</sub>, and <sup>3</sup>H<sub>4</sub> are shown. It is shown that absorption at 680 nm and 790 are insensitive to the addition of Ho<sub>2</sub>O<sub>3</sub> in contrast to that at 580 nm and 650 nm.</p>

Physical Properties Study of Sodium Doped Boro-Tellurite (Na₂O: TeO₂-B₂O₃-ZnO) Glasses

“…Tellurite glass has excellent properties and wide applications in optoelectronics, lasing material, sensing, and radiation shielding [4,5,6,7]. It has high refractive index, good thermal stability, good chemical and physical durability, low melting points, and low phonon energy [8,9]. However, tellurite can't stand alone as a glass former, because it possesses a high rate of crystallization [10,11].…”