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用激光热梯度法生长的高质量Yb:YAG单晶光纤的特性及其变色效应。

The characteristics of high-quality Yb:YAG single crystal fibers grown by a LHPG method and the effects of their discoloration.

作者信息

Wang Tao, Zhang Jian, Zhang Na, Wang Siyuan, Wu Baiyi, Jia Zhitai, Tao Xutang

机构信息

State Key Laboratory of Crystal Materials, Shandong University Jinan 250100 China

Key Laboratory of Functional Crystal Materials and Device, Ministry of Education Jinan 250100 China.

出版信息

RSC Adv. 2019 Jul 22;9(39):22567-22575. doi: 10.1039/c9ra03633d. eCollection 2019 Jul 17.

DOI:10.1039/c9ra03633d
PMID:35519442
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9067027/
Abstract

Single crystal fibers (SCFs), especially ytterbium (Yb) doped crystal fibers, have great potential in the field of high-power lasers. Colorless Yb:YAG single crystal fibers were fabricated using a laser heated pedestal growth (LHPG) method with a diameter fluctuation of less than 2% and a length to diameter ratio greater than 320 : 1. An abnormal color issue exists with respect to Yb:YAG crystals. The origin of coloration was studied density functional theory, single-crystal X-ray diffraction, XPS and Raman spectroscopy and it was confirmed that the cyan coloration of Yb:YAG crystals is due to oxygen vacancies. Yb:YAG SCFs prepared the LHPG method could avoid this type of defect due to the large specific surface area and melt convection caused by surface tension. The fundamental properties of the cyan Yb:YAG crystal source rod and colorless Yb:YAG SCFs were systematically investigated. The colorless Yb:YAG SCFs have higher infrared transmittance and thermal conductivity. The distributions of Yb along the radial and axial directions were also measured. Meanwhile we demonstrated the propagation loss and a fiber laser using the colorless Yb:YAG SCFs, obtaining a minimum loss coefficient of 0.008 dB cm and a maximum continuous-wave (CW) output power of 3.62 W. The colorless Yb:YAG SCFs with good thermal conductivity, low propagation loss, wide transparency and uniform ion distribution show promise for acting as the host material in single-mode lasers.

摘要

单晶光纤（SCFs），尤其是掺镱（Yb）的晶体光纤，在高功率激光器领域具有巨大潜力。采用激光加热基座生长（LHPG）法制备了无色Yb:YAG单晶光纤，其直径波动小于2%，长径比大于320:1。Yb:YAG晶体存在异常的颜色问题。利用密度泛函理论、单晶X射线衍射、X射线光电子能谱和拉曼光谱研究了其着色起源，证实Yb:YAG晶体的青色是由氧空位引起的。采用LHPG法制备的Yb:YAG单晶光纤由于比表面积大以及表面张力引起的熔体对流，可以避免此类缺陷。系统研究了青色Yb:YAG晶体源棒和无色Yb:YAG单晶光纤的基本特性。无色Yb:YAG单晶光纤具有更高的红外透过率和热导率。还测量了Yb沿径向和轴向的分布。同时，我们展示了无色Yb:YAG单晶光纤的传输损耗和光纤激光器，获得了最低损耗系数0.008 dB/cm和最大连续波（CW）输出功率3.62 W。具有良好热导率、低传输损耗、宽透明度和均匀离子分布的无色Yb:YAG单晶光纤有望作为单模激光器的基质材料。

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