高峰值功率大模场全光纤脉冲放大器
High peak power large mode area all fiber pulse amplifier
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摘要: 报道了一种由纤芯直径分别为15 μm和25 μm的大模场光纤组成的全光纤脉冲放大器模块。当注入脉冲宽度为10 ns，重复频率为1 Hz，光谱宽度为0.3 nm，脉冲能量为80 nJ的激光脉冲时，经过两级放大输出的激光脉冲峰值功率为30 kW，单脉冲能量为300 μJ。此外，实验研究了该放大器模块输出的时间特性。研究发现：由于受激布里渊散射（SBS）效应，限制了单纵模光纤激光在光纤中的高能量放大，采用宽带激光脉冲可以有效地抑制SBS效应，提高光纤放大器的SBS阈值。Abstract: A power fiber amplifier module consisting of two stage fiber amplifiers, whose fiber core diameters were 15 μm and 25 μm respectively, was presented. It can output 30 kW peak power with 300 μJ output energy, when the input pulsed signal is 10 ns in duration，1 Hz in repetition frequency, 0.3 nm in spectrum width, and 80 nJ in energy. The output pulse’s temporal characteristic was investigated. It is found that the output energy of the amplifier module is confined by stimulated Brillouin scattering（SBS）effect when the input pulse is narrow banded, and adopting the broadband pulse could improve the SBS threshold of the fiber amplifier．
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Key words:
- fiber optics /
- fiber amplifier /
- nonlinear effect /
- gain saturation
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