Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Opt Lett. 2011 Jul 15;36(14):2605-7. doi: 10.1364/OL.36.002605.
Nanosecond, 1053 nm optical pulses are amplified from 15 pJ to 240 nJ by a Yb-doped all-fiber regenerative amplifier (AFRA), achieving an overall gain of 42 dB. To the best of our knowledge, this is the highest output-pulse energy from an AFRA ever reported. Techniques for suppressing amplified spontaneous emission are employed to favor the signal gain 23 nm off the gain peak of the Yb-doped fiber. Numerical simulations show that increasing the number of round trips and operating the AFRA at saturation will increase the output level and improve the output stability. This is currently limited by the onset of bifurcation instability, which can be avoided at low repetition rates.
纳秒、1053nm 光脉冲通过掺镱全光纤再生放大器（AFRA）从 15pJ 放大到 240nJ，实现了 42dB 的总增益。据我们所知，这是迄今为止报道的 AFRA 中最高的输出脉冲能量。采用放大自发辐射抑制技术，有利于在掺镱光纤增益峰的 23nm 处获得信号增益。数值模拟表明，增加往返次数并使 AFRA 工作在饱和状态，将提高输出水平并改善输出稳定性。这目前受到分岔不稳定性的限制，可以在低重复率下避免。
