Multifunctional single-crystal tellurium core multimaterial fiber via thermal drawing and laser recrystallization |
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Authors: | Bin Han Qianhang Luo Pengyu Zhang Ting Zhang Guowu Tang Zhe Chen Hang Zhang Baoan Zhong Yunhao Zeng Min Sun Qi Qian Zhongmin Yang |
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Affiliation: | 1. State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Provincial Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou, China;2. Institute of Engineering Thermophysics, Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijing, China;3. Qing Yuan Chung Shun Century Fiberglass Co., Ltd., Qingyuan, China |
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Abstract: | In the field of multimaterial optical fibers, the demand for high-performance single-crystal core glass-clad multimaterial optical fibers is increasing. However, the applications of single-crystal fibers are restricted by the complex fabrication processes and the slow growth of single-crystal materials. Here, a two-step method is demonstrated to achieve single-crystal tellurium (Te) core fibers with high crystal quality over the length of the fiber. This method starts with the thermal drawing of a fiber preform into polycrystalline Te core multimaterial fibers (precursor fibers) that are long and mechanically stable. A 532-nm continuous laser is then employed to recrystallize the Te core in the precursor fiber into a single crystal state along the entire length of the fiber. Experimental studies of these single-crystal fibers demonstrate that the single-crystal Te core fibers possess high transmittance (>90% at 2–10 μm) and high thermoelectric performance (ZT values from 0.03 to 0.13 at 300 K temperature). They are superior to previous reports and our previous work. This method works for fabricating various single-crystal fibers and has important applications in the field of optical fibers, functional fibers, and their integrated devices. |
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Keywords: | laser recrystallization multimaterial fiber single-crystal Te |
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