Potential Laser Crystal of Zn4B6O13:Mn2+ with Low Thermal Expansion and High Thermal Conductivity: Single-Crystal Growth and Characterization

IF 3.2 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Zhengli Liang, Yuchao Li, Qin Chen, Ran Zhang, Youquan Liu, Xingxing Jiang*, Guochun Zhang and Zheshuai Lin*, 
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Abstract

Laser crystals, serving as the laser gain medium, are key materials in all-solid-state lasers. Due to considerable thermal expansion and low thermal conductivity, the performance of conventional laser crystals strongly depends on thermal management systems to improve the laser quality and power, which inevitably restricts the development of laser technology. In this work, a new potential laser crystal of Mn2+-doped Zn4B6O13 (ZBO) with a low thermal expansion and high thermal conductivity was grown and characterized. The strong luminescence emission at 539 nm in ZBO:Mn2+ was observed, with a long lifetime of 16.20(7) ms, and the corresponding absorption bands in the range of 410–460 nm fall within the spectra of GaN- or InGaN-based laser diodes. In variable-temperature fluorescence spectra, promoted by relaxation on the parity-forbidden 4T1-to-6A1 transition from the increased phonon number, an abnormal negative thermal quenching was manifested below 140 K, with the lifetime consistently greater than 10 ms over the whole temperature range of 80–500 K. Meanwhile, ZBO:Mn2+ manifests very low thermal expansion (3.1 MK–1) and high thermal conductivity (27.44(6) W/(m·K)) at room temperature (300 K). These excellent thermal properties, combined with good optical properties, make ZBO:Mn2+ an outstanding gain medium for green laser generation. Our study confirms that ZBO is a promising laser matrix crystal.

Abstract Image

低热膨胀高导热Zn4B6O13:Mn2+激光势晶:单晶生长与表征
激光晶体作为激光增益介质,是全固态激光器的关键材料。传统激光晶体由于热膨胀大、导热系数低,其性能在很大程度上依赖于热管理系统来提高激光质量和功率,这必然制约了激光技术的发展。本文生长并表征了一种新型低热膨胀、高导热的掺Mn2+ Zn4B6O13 (ZBO)激光势晶体。ZBO:Mn2+在539 nm处有较强的发光发射,寿命为16.20(7)ms, 410 ~ 460 nm的吸收光谱属于GaN基或ingan基激光二极管的光谱范围。在变温荧光光谱中,由于声子数增加导致奇偶禁止的4t1 - 6a1跃迁弛豫,在140 K以下表现出异常的负热猝灭,在80-500 K的整个温度范围内,寿命始终大于10 ms。同时,ZBO:Mn2+在室温(300 K)下表现出极低的热膨胀(3.1 MK-1)和高导热系数(27.44(6)W/(m·K)),这些优异的热性能加上良好的光学性能,使ZBO:Mn2+成为绿色激光产生的优秀增益介质。我们的研究证实了ZBO是一种很有前途的激光基质晶体。
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来源期刊
Crystal Growth & Design
Crystal Growth & Design 化学-材料科学:综合
CiteScore
6.30
自引率
10.50%
发文量
650
审稿时长
1.9 months
期刊介绍: The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.
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