Growth and spectral property of Er3+:Ca2.25Sr0.75NbGa3Si2O14 mixed crystal with broad 1.5–1.6 μm emission band

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-04-12 DOI:10.1016/j.optmat.2025.117050

Dongfeng Bai , Jianhua Huang , Xinghong Gong , Yanfu Lin , Yidong Huang , Yujin Chen

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Abstract

An Er³⁺:Ca_2.25Sr_0.75NbGa₃Si₂O₁₄ crystal was grown by the Czochralski method. Based on the analysis of the crystal structure, the origin of the color centers in the crystal was explored, and then an appropriate annealing method was employed to eliminate them. Polarized spectral properties of the crystal were investigated at room temperature. The peak emission cross section of the crystal is 1.10 × 10⁻²⁰ cm² at 1532.4 nm for the α polarization. Due to the increment in structural diversity of Er³⁺ clusters caused by the random distribution of Ca²⁺ and Sr²⁺ at the same lattice site, the full width at half-maximum of the emission band in 1.5–1.6 μm is up to 64 nm in the crystal. The fluorescence lifetime of the ⁴I_13/2 multiplet of Er³⁺ in the crystal is 5.45 ms. The results indicate that the Er³⁺:Ca_2.25Sr_0.75NbGa₃Si₂O₁₄ crystal may be a promising gain medium for the ultra-short pulse and broadband tunable lasers in 1.5–1.6 μm.

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具有1.5 ~ 1.6 μm宽发射带的Er3+:Ca2.25Sr0.75NbGa3Si2O14混合晶体的生长和光谱特性

利用 Czochralski 方法生长了 Er3+:Ca2.25Sr0.75NbGa3Si2O14 晶体。在分析晶体结构的基础上，探究了晶体中色心的来源，并采用适当的退火方法消除了色心。研究了晶体在室温下的偏振光谱特性。在 1532.4 纳米波长处，该晶体在 α 偏振下的发射截面峰值为 1.10 × 10-20 cm2。由于 Ca2+ 和 Sr2+ 在同一晶格位点的随机分布导致 Er3+ 团簇的结构多样性增加，在晶体中，1.5-1.6 μm 的发射带半最大全宽高达 64 nm。晶体中 Er3+ 的 4I13/2 多倍子的荧光寿命为 5.45 ms。结果表明，Er3+:Ca2.25Sr0.75NbGa3Si2O14 晶体可能是 1.5-1.6 μm 波段超短脉冲和宽带可调谐激光器的理想增益介质。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.