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Polycrystalline Ho:YAG Transparent Ceramics for Eye-Safe Solid State Laser Applications

Authors

  • Hao Yang,

    1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
    2. School of Materials Science and Engineering, Nanyang Technological University, Singapore
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  • Jian Zhang,

    Corresponding author
    1. Temasek Laboratories of Nanyang Technological University, Singapore
    2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
    • College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
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  • Xianpeng Qin,

    Corresponding author
    1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
    2. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
    • College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
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  • Dewei Luo,

    Corresponding author
    1. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
    • College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
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  • Jan Ma,

    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore
    2. Temasek Laboratories of Nanyang Technological University, Singapore
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  • Dingyuan Tang,

    Corresponding author
    1. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
    • College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
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  • Hao Chen,

    1. Department of Optical Science and Engineering, Fudan University, Shanghai, China
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  • Deyuan Shen,

    1. Department of Optical Science and Engineering, Fudan University, Shanghai, China
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  • Qitu Zhang

    Corresponding author
    • College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, China
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  • This study was supported by NSFC (50902139, 60928010), Nanjing University of Technology PhD thesis innovation fund (BSCX200902) and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Authors to whom correspondence should be addressed. e-mails: njzqt@126.com and jianzhang@ntu.edu.sg

Abstract

High optical quality holmium doped yttrium aluminum garnet (Ho:YAG) transparent ceramics that contained 0.5–2.0 at.% holmium additives were fabricated by a reactive sintering method under vacuum. Fully dense Ho:YAG ceramics with the average grain size of ~10 μm were obtained after vacuum sintered at 1780°C for 8 h. The in-line transmittances in the visible and infrared region are higher than 82% and 84%. The absorption coefficients of the 0.8, 1.0, 1.5, and 2.0 at.% Ho:YAG ceramics at 1907 nm was calculated to be 0.72, 0.89, 1.32, and 1.78 cm−1, respectively. The absorption cross-section of Ho:YAG ceramic was 0.645 × 10−20 cm2. The 1.5 and 2.0 at.% Ho:YAG ceramic slabs were in-band pumped by a Tm:fiber laser at 1907 nm. A maximum output power of 20.6 W at 2097 nm was obtained with a corresponding slope efficiency of 60.9%.

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