Er<sup>3+sup>-Yb<sup>3+sup> codoped phosphate glasses used for an efficient 1.5 渭m broadband gain medium
- 作者：F. Rivera-Ló ; pez<sup>asup> ; P. Babu<sup>bsup> ; L. Jyothi<sup>csup> ; U.R. Rodrí ; guez-Mendoza<sup>asup><sup> ; sup><sup>1sup> ; I.R. Martí ; n<sup>asup><sup> ; sup><sup>1sup> ; C.K. Jayasankar<sup>csup> ; V. Laví ; n<sup>asup><sup> ; sup><sup>1sup><sup> ; sup><sup>vlavin@ull.essup>
- 关键词：Phosphate glass ; Erbium ; Ytterbium ; Absorption and emission cross-sections ; Energy transfer ; Optical amplification
- 刊名：Optical Materials
- 出版年：2012
- 期刊代码：81_09253467
- 类别：ch
- 出版时间：June, 2012
- 卷：34
- 期：8
- 页码：1235-1240
- 文件大小：819 K
摘要
In order to develop efficient optical amplifiers with broad and flat gain profiles in the near-infrared range an active phosphate matrix codoped with Er<sup>3+sup> and Yb<sup>3+sup> rare earth optically active ions has been studied by carrying out steady-state and time-resolved luminescence spectroscopies. Taking advantage of the high absorption transition probability of the Yb<sup>3+sup> ions, these ions are excited with cw 980 nm radiation from a commercial laser diode and subsequently de-excited by efficiently transferring energy to the Er<sup>3+sup> ions, producing an intense emission at around 1.5 渭m at which wavelength-division-multiplexing devices work. From the experimental data, the emission cross-section 蟽<sub>emsub>(位) of the <sup>4sup>I<sub>13/2sub> 鈫?#xA0;<sup>4sup>I<sub>15/2sub> transition at 1.5 渭m has been calculated using the F眉chtbauer-Landerburg method. The result of this calculation, together with the absorption cross-section 蟽<sub>abssub>(位), allows the gain cross-section G to be estimated. Other important spectroscopic parameters associated with this transition, such as full width at half maximum FWHM, effective bandwidth 螖<sub>effsub> and lifetime of the <sup>4sup>I<sub>13/2sub> level 蟿<sub>expsub>, have been measured and analysed as a function of the Er<sup>3+sup> concentration. As figures of merit, FWHM 脳 蟽<sub>emsub>(位), 螖<sub>effsub> 脳 蟽<sub>emsub>(位) and 蟽<sub>emsub>(位) 脳 蟿<sub>expsub> calculations have been carried out. Comparing the obtained values to those reported in other Er<sup>3+sup>-doped materials, the phosphate glasses doped with 1 mol%of Yb<sub>2sub>O<sub>3sub> ions and 1-2 mol%of Er<sub>2sub>O<sub>3sub> can be considered excellent candidates for developing broadband optical amplifiers, providing a large gain cross-section that covers the C (1530-1565 nm) and the L (1565-1625 nm) bands in the optical telecommunication window.