Lin, Yen-ShengYen-ShengLinLai, Chien-ChihChien-ChihLaiHuang,Kuang-YaoHuangChen, Jian-ChengJian-ChengChenLo, Chia-YaoChia-YaoLoSHENG-LUNG HUANGChang, Tao-YuanTao-YuanChangJi, Jiun-YuJiun-YuJiShen, PouyanPouyanShen2011-08-092018-07-052011-08-092018-07-05200600220248http://www.scopus.com/inward/record.url?eid=2-s2.0-33644862341&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/323828http://ntur.lib.ntu.edu.tw/bitstream/246246/236477/-1/08.pdfThe microstructures of double-clad Cr4+:YAG crystal fibers grown using a co-drawing laser-heated pedestal growth method were studied by high-resolution transmission electron microscopy and photoluminescence spectroscopy. The core is single-crystalline garnet elongated in [1 1 1] direction, whereas inner cladding a composite of Cr3+:γ-Al 2O3 nanocrystals in Cr4+: silicate glass due to YAG/SiO2 inter-diffusion and a high crystal-field-stabilization energy of Cr3+ attained in close packed oxide. Cr4+ fluorescence intensity decreases and shifts to lower wavelength for the inner cladding in comparison with the core. © 2006 Elsevier B.V. All rights reserved.A1. Interdiffusion; B1. Cr+4:YAG crystal fiber; B1. Nanocrystal[SDGs]SDG7Chromium; Composite materials; Garnets; Microstructure; Nanostructured materials; Photoluminescence; Positive ions; Silica; Transmission electron microscopy; Yttrium compounds; Cr+4: YAG crystal fiber; Interdiffusion; Nanostructure formation; Crystal growthjournal article10.1016/j.jcrysgro.2005.11.1282-s2.0-33644862341http://ntur.lib.ntu.edu.tw/bitstream/246246/236477/-1/08.pdf