~2μm single-mode laser output in Tm3+-doped tellurium germanate double-cladding fiber

• 作 者: SongGao[1]Pei-WenKuan[1]XueqiangLiu[1]DanpingChen[2]MeisongLiao[2]LiliHu[2]
• 机 构: Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China
• 出 处: 第八届中国功能玻璃学术研讨会暨新型光电子材料国际论坛
• 发表日期: 2015年期

　　A single-mode laser output of 0.75 W near 2 μm was obtained with a slope efficiency of 28.7%with respect to the absorbed pump power when a self-developed double-cladding Tm3+-doped tellurium germanate glass fiber laser was pumped byusing a793 nm diode laser.The core glass possesses an infrared cut-off edge reaching~5 μm.The calculated peak emission cross-section of Tm3+ at 1.9 μm was 6.8 × 10-21 cm2.The measured fluorescence lifetime of 3F4 energy level was 2.96 ms.A single-mode double-cladding tellurium germanate glass fiber was fabricated in house by using the rod-in-tube drawing technique.The lasing threshold was 0.56 W and the lasing wavelength was centered at 1968 nn.Spatial beam quality of the fiber was measured and a value ofiM2 =1.36 was obtained.