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构建了掺镱大模场面积单偏振光子晶体光纤飞秒激光非线性放大系统.讨论了腔内净色散量和抽运功率对振荡级输出参数的影响和振荡级参数对放大级输出参数的影响.在本实验条件下,当腔内净色散量取较大负色散时,振荡级直接输出的脉冲更宽,且携带更少的啁啾.当振荡级抽运4.53 W时,选择最接近变换极限的脉冲作为种子脉冲,放大级在60 W抽运时输出压缩后无基底的短脉冲,宽度为45.7 fs,平均功率28 W.振荡级抽运功率增加到5.08 W,放大级抽运70 W时,获得最高输出功率34.5 W,对应脉宽53.5 fs.
A nonlinear amplification system of ytterbium-doped single-polarization photonic crystal fiber femtosecond laser with large mode-field area was constructed. The effects of the net chromatic dispersion and pump power on the output parameters of oscillating stage and the influence of oscillating parameters on the output parameters of the amplifier stage Under the experimental conditions, when the intra-cavity net dispersion is larger negative dispersion, the pulse output directly from the oscillation stage is wider and carries less chirp. When the oscillation stage is pumped 4.53 W, the closest transformation is chosen The limit pulse is used as a seed pulse and the amplifier stage outputs a short pulse of no substrate after compression at 60 W with a width of 45.7 fs and an average power of 28 W. Oscillation pump power is increased to 5.08 W and amplifier pump 70 W , The highest output power of 34.5 W is obtained, corresponding to a pulse width of 53.5 fs.