Lai, Chien-ChihChien-ChihLaiTsai, Hann-JongHann-JongTsaiHuang, Kuang-YaoKuang-YaoHuangHsu, Kuang-YuKuang-YuHsuLin, Zhi-WeiZhi-WeiLinJi, Kuan-DongKuan-DongJiZhuo, Wen-JunWen-JunZhuoSHENG-LUNG HUANG2009-03-112018-07-062009-03-112018-07-06200801469592http://ntur.lib.ntu.edu.tw//handle/246246/144210https://www.scopus.com/inward/record.uri?eid=2-s2.0-58149140219&doi=10.1364%2fOL.33.002919&partnerID=40&md5=90eab7751152f8eb9deea98a5c4fe2edWe report what we believe to be the first demonstration of a room-temperature, continuous-wave Cr4+: Y3Al 5O12 (Cr4+: YAG) double-clad crystal fiber laser grown by the codrawing laser heated pedestal growth method. The threshold is below 100 mW, which is a factor of 4 lower than previously reported Cr 4+-doped lasers. A slope efficiency of 6.9% was obtained, and is in good agreement with the numerical simulation. In additional to small core diameter, the low-threshold lasing is made possible by the low propagation loss of 0.08 dB/cm and the high crystallinity of the core. © 2008 Optical Society of America.application/pdf363491 bytesapplication/pdfen-USFiber lasers; Codrawing laser heated pedestal growth; Continuous Wave; Core diameters; Crystal fiber laser; High crystallinity; Low propagation loss; Low-threshold lasing; Slope efficiencies; Crystal whiskersjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/144210/1/11.pdf