Highly Er³⁺‐doped La₂O₃–Ga₂O₃ glasses up to ≈5.85 × 10²¹ cm⁻³ in Er³⁺ concentration are synthesized by an aerodynamic levitation technique. The glasses are characterized by high glass‐transition temperatures, low OH⁻ absorptions, and long infrared cut‐off wavelengths. Judd–Ofelt analysis reveals a large radiative transition rate and a high branching ratio of the ⁴I_11/2 → ⁴I_13/2 transition, e.g., 46 s⁻¹ and 21%, respectively, at 10 mol% Er₂O₃. The intensity of 2.7 µm emission drastically increases with increasing Er₂O₃ content and reaches a maximum at 10 mol% Er₂O₃. By contrast, the intensity of the 1.5 µm emission decreases with increasing Er₂O₃ content when the Er₂O₃ content is greater than 1 mol%. The emission cross‐section and the gain bandwidth at 2.7 µm are as large as 9.05 × 10⁻²¹ cm² and 9.19 × 10⁻²⁶ cm³ at 10 mol% Er₂O₃, respectively. The upconversion spectra also indicate that the investigated glasses exhibit small multiphonon relaxation rates and large quenching concentrations.

中文翻译：

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通过空气悬浮技术制备的高掺‐镓酸镓镧玻璃中的2.7 µm中红外辐射

通过空气悬浮技术合成了Er ³⁺浓度高达≈5.85×10 ²¹ cm ^-3的高度掺杂Er ^3+的La ₂ O ₃ -Ga ₂ O ₃玻璃。玻璃由高玻璃化转变温度，低OH特征在于^-吸收，和长红外截止波长。Judd–Ofelt分析显示，在10 mol％Er ₂ O下，⁴ I _11/2 → ⁴ I _13/2跃迁具有较大的辐射跃迁速率和较高的分支比，例如分别为46 s ^-1和21％。₃。随Er ₂ O ₃含量的增加，2.7 µm的发射强度急剧增加，并在10 mol％Er ₂ O _3时达到最大值。相反，当Er ₂ O ₃含量大于1mol％时，随着Er ₂ O ₃含量的增加，1.5μm发射的强度降低。在10 mol％Er ₂ O _3下，发射截面和2.7 µm处的增益带宽分别为9.05×10 ^-21 cm ²和9.19×10 ^－26 cm ³。， 分别。上转换光谱还表明，所研究的玻璃表现出小的多声子弛豫速率和大的猝灭浓度。