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Broadband 1.20μm emission originating from the Thulium (Tm 3+ ): 1 G 4 → 3 H 4 transition was observed in Tm 3+ -doped gallogermanate glasses under 476.5nm excitation. The stimulated emission cross-section is calculated to be 2.85×10 –21 cm 2 using the Füchtbauer–Ladenburg approach. Difficulty in the population inversion between the upper...
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