Abstract
Ho3+/Tm3+ co-doped 50TeO2-25GeO2-3WO3-5La2O3-3Nb2O5-5Li2O-9BaF2 glass fiber is prepared with the rod-tube drawing method of 15 μm core diameter and 125 μm inner cladding diameter applied in the 2.0 μm-infrared laser. The 2.0 μm luminescence properties of the core glass are researched and the fluorescence intensity variation for different Tm3+ doping concentration is systematically analyzed. The results show that the 2.0 μm luminescence of Ho3+ is greatly influenced by the doping concentration ratio of Ho3+ to Tm3+ and that the maximum fluorescence intensity of the core glass can be obtained and its emission cross section can reach 0.933 × 10−21 cm2 when the sensitized proportion of holmium to thulium is 0.3 to 0.7 (mol%). Simultaneously, the maximum phonon energy of the core glass sample is 753 cm−1, which is significantly lower than that of silicate, gallate and germanate glass and the smaller matrix phonon energy can be conductive to the increase 2.0 μm-band emission intensity. The continuous laser with the maximum laser output power of 0.993 W and 2051 nm -wavelength of 31.9%-slope efficiency is output within the 0.5 m glass fiber and the experiment adopts 1560 nm erbium-doped fiber laser(EDFL) as the pump source and the self-built all-fiber laser. Therefore, the glass fiber has excellent laser characteristics and it is suitable for the 2.0 μm-band laser.
Highlights
The tuning range is from 1.87 μm to 2.16 μm for the solid laser with the single Tm3+-doped as the luminescent center, and the fluorescence lifetime of the Tm3+ ion is very long, which is conducive to high energy Q-switched laser output
The output power of 885 W for the 2.0 μm band laser has been realized in Tm3+ -doped quartz glass, the quartz glass substrate has the characteristics of high phonon energy, the non-radiative transition energy loss due to multi-phonon relaxation at lower energy level occupies a dominant position, leading to the decrease of radiation quantum efficiency and fluorescence quenching effect, which is disadvantageous to the miniaturization and high gain of fiber lasers and this limits the further improvement of the performance of the 2.0 μm band quartz fiber lasers[19,20]
The Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass fiber is prepared with the rod-tube drawing method, based on the Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass formulations of 50TeO2-25GeO2-3WO3-5La2O3-3Nb2O5-5Li2O9BaF2, the spectrum properties of prepared fiber is researched, the influences of 2.0 μm luminescence intensity for the different doping concentrations are discussed and the 2051 nm mid-infrared laser output is implemented in the Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass fiber with self-designed all-fiber laser
Summary
The tuning range is from 1.87 μm to 2.16 μm for the solid laser with the single Tm3+-doped as the luminescent center, and the fluorescence lifetime of the Tm3+ ion is very long, which is conducive to high energy Q-switched laser output. Until 2008, Jackson et al of University of Manchester adopted a 793 nm semiconductor laser to pump Ho3+/Tm3+ co-doped double-clad silica fibers and obtained a 83-W, 2.015-μm laser output with a slope efficiency of 42% This is the current highest record for Ho3+/Tm3+ co-doped laser. The output power of 885 W for the 2.0 μm band laser has been realized in Tm3+ -doped quartz glass, the quartz glass substrate has the characteristics of high phonon energy, the non-radiative transition energy loss due to multi-phonon relaxation at lower energy level occupies a dominant position, leading to the decrease of radiation quantum efficiency and fluorescence quenching effect, which is disadvantageous to the miniaturization and high gain of fiber lasers and this limits the further improvement of the performance of the 2.0 μm band quartz fiber lasers[19,20]. The Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass fiber is prepared with the rod-tube drawing method, based on the Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass formulations of 50TeO2-25GeO2-3WO3-5La2O3-3Nb2O5-5Li2O9BaF2, the spectrum properties of prepared fiber is researched, the influences of 2.0 μm luminescence intensity for the different doping concentrations are discussed and the 2051 nm mid-infrared laser output is implemented in the Ho3+/Tm3+ ions co-doped lanthanum tungsten germanium tellurite glass fiber with self-designed all-fiber laser
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