Abstract
The effects of substitution of BaF2 for BaO on physical properties and 1. 8 μm emission have been systematically investigated to improve spectroscopic properties in Tm3+ doped gallium tellurite glasses for efficient 2.0 μm fiber laser. It is found that refractive index and density gradually decrease with increasing BaF2 content from 0 to 9 mol.%, due to the generation of more non-bridging oxygens. Furthermore, OH− absorption coefficient (αOH) reduces monotonically from 3.4 to 2.2 cm−1 and thus emission intensity near 1.8 μm in gallium tellurite glass with 9 mol.% BaF2 is 1.6 times as large as that without BaF2 while the lifetime becomes 1.7 times as long as the one without BaF2. Relative energy transfer mechanism is proposed. The maximum emission cross section and gain coefficient at around 1.8 μm of gallium tellurite glass containing 9 mol.% BaF2 are 8.8 × 10−21 cm2 and 3.3 cm−1, respectively. These results indicate that Tm3+ doped gallium tellurite glasses containing BaF2 appear to be an excellent host material for efficient 2.0 μm fiber laser development.
Highlights
Over the past few decades, fiber lasers operating in eye-safe 2.0 μm spectral region have attracted a great deal of attention due to strong absorption band of several chemical compounds (H2O, CO2, N2O, etc.) in this region (Chen et al, 2010)
It is found that the refractive index and density monotonously decrease when BaF2 content increases from 0 to 9 mol.% in step of 3 mol.%
It is noted that three major bands appear in TGB glasses with different BaF2 amounts
Summary
Over the past few decades, fiber lasers operating in eye-safe 2.0 μm spectral region have attracted a great deal of attention due to strong absorption band of several chemical compounds (H2O, CO2, N2O, etc.) in this region (Chen et al, 2010). There are some potential applications in eye-safe laser radar, material processing, laser surgery, remote sensing and effective pump sources as mid-infrared lasers and optical parametric oscillators (Geng et al, 2011; Geng and Jiang, 2014; Slimen et al, 2019; Wang et al, 2019). Compared with Ho3+, Tm3+ owns very strong absorption band of 3H6→3H4 transition and can be effectively pumped by commercial high-power 808 nm laser diode. Broad emission bandwidth of Tm3+ :3 F4→3H6 transition about 300 nm is advantageous to the generation of femtosecond pulse (Agger et al, 2004)
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