Double clad tapered fiber for high power applications

被引:156
作者
Filippov, V. [1 ]
Chamorovskii, Yu. [2 ]
Kerttula, J. [1 ]
Golant, K. [3 ]
Pessa, M. [1 ]
Okhotnikov, O. G. [1 ]
机构
[1] Tampere Univ Technol, Optoelect Res Ctr, FIN-33101 Tampere, Finland
[2] Russian Acad Sci, Inst Radio & Elect, Moscow 125009, Russia
[3] Russian Acad Sci, Fiber Opt Res Ctr, Moscow 119333, Russia
关键词
D O I
10.1364/OE.16.001929
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report a novel type of active fiber - tapered double clad fiber suitable for pumping by low brightness sources with large beam parameter product of 50 divided by 300 mm x mrad. Ytterbium double clad all-silica fiber )core/1(st) clad/2(nd) clad diameters 27/834/890 mu m, NA(core) = 0.11, NA(clad) = 0.21), tapered down by a factor 4.8 for a length of 10.5 m was drawn from a preform fabricated by plasma chemical technologies. At a moderate Yb-ion concentration and 1:31 core/cladding ratio, the tapered double clad fiber demonstrates 0.9 dB/m pump absorption at 976 nm and excellent lasing slope efficiency. An ytterbium fiber laser with 84 W of output power and 92% slope efficiency, a 74 W superfluorescent source with 85% slope efficiency and amplifiers operating both in CW and pulsed regimes have been realized. All devices demonstrated robust single mode operation with a beam quality factor of M-2 = 1.07. (C) 2008 Optical Society of America.
引用
收藏
页码:1929 / 1944
页数:16
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