Highly efficient mid-infrared 2 μm emission in Ho<sup>3+</sup>/Yb<sup>3+</sup>-codoped germanate glass

Publication Type:
Journal Article
Optical Materials Express, 2015, 5 (6), pp. 1431 - 1439
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© 2015 Optical Society of America. This work reports the mid-infrared emission properties around 2 μm in Ho3+/Yb3+ codoped germanate glasses. The glass not only possesses good chemical durability and good thermal stability but also has high midinfrared transmittance around 2 μm (90%). In addition, the glass possesses considerably low OH- content (20.45 ppm) and large spontaneous transition probability (103.38 s-1) corresponding to the Ho3+:5I7→5I8 transition. Moreover, the measured lifetime of Ho3+:5I7 level is as high as 7.68 ms, and the quantum efficiency at 2 μm can reach 79.4%. The energy transfer processes of Yb3+:2F5/2 level and Ho3+:5I6 level were quantitatively analyzed according to the rate equation. Results indicate that the prepared germanate glass is a promising candidate for 2 μm mid-infrared laser materials applications.
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