19 August 2011 High power picosecond amplification in a large core double-clad Yb-doped fiber
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Abstract
We report on the amplification of 21ps pulses up to 10W average output power in both a conventional ytterbium-doped large-core double-clad fiber and photonic crystal fiber (PCF). The picosecond fiber amplifier system consists of a mode-locked Nd:YVO4 oscillator and a diode-pumped double-clad large-core ytterbium-doped fiber. a passively mode-locked (SESAM) Nd:YVO4 oscillator is used as the picosecond seed source, which has repetition rate of 93 MHz, pulse duration as short as 19.2 ps at 1064 nm and an average power of 380 mW. At first, conventional double clad fiber is used as the amplifier medium, which has an inner cladding diameter of 250 μm and the active core diameter of 30 μm. The absorption coefficient of this fiber is as high as 9 dB/m at 976 nm. Secondly, PCF with an inner cladding diameter of 200 μm, the active core diameter of 40 μm is chosen for the amplifier with the same absorption coefficient as the conventional double clad fiber. For these two kinds of fiber amplifiers, both more than 10 W amplified output power have been achieved. Since lager mode area double clad ytterbium-doped fiber and photonic crystal fiber have been chosen in the amplifier, which would lead to a reduced nonlinearity, spectral broadening due to SPM is extensively suppressed.
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Ping-xue Li, Ping-xue Li, Zhi Liu, Zhi Liu, Xue-xia Zhang, Xue-xia Zhang, Jun-jie Chi, Jun-jie Chi, } "High power picosecond amplification in a large core double-clad Yb-doped fiber", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 819225 (19 August 2011); doi: 10.1117/12.900512; https://doi.org/10.1117/12.900512
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