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54 W nanosecond Yb-doped all-fiber amplifier at ultra-high repetition rate (tens of MHz) based on mode-locked fiber oscillator and single-mode fiber stretcher
Laser Physics ( IF 1.2 ) Pub Date : 2021-01-12 , DOI: 10.1088/1555-6611/abd55a
Min Yang , Pingxue Li , Shun Li , Wenhao Xiong , Kaixuan Wang , Chuanfei Yao , Dongsheng Wang

We report on a nanosecond all-fiber amplifier with repetition rate of tens of MHz. It is based on a passively mode-locked fiber oscillator at 1064 nm, which has a pulse width of 28 ps and repetition rate of 27.7 MHz. The single-mode fiber with length of 8 km is adopted as a fiber stretcher, in which new frequency components are introduced by strong nonlinear effect such as self-phase modulation, resulting in the broadening of spectral bandwidth from 0.4 nm to around 20 nm. The group-velocity dispersion of the 8 km fiber stretcher is −38 ps (nm km) −1, which stretches the pulse duration of the picosecond pulse to 1–7 ns. At the repetition rate of 27.7 MHz, an average power of 54 W is demonstrated with pulse width of 1.3 ns, and 21 W is achieved with pulse width of ∼5 ns, which have optical-to-optical conversion efficiencies of 41.2% and 30.1% respectively. This all-fiber amplifier based on the passively mode-locked fiber oscillator and 8 km single-mode fiber stretcher is capable of delivering nanosecond pulses while maintaining an ultra-high repetition rate of tens of MHz.



中文翻译:

基于锁模光纤振荡器和单模光纤扩展器的54 W纳秒掺Yb全光纤放大器,具有超高重复频率(数十MHz)

我们报告了一个具有数十MHz重复频率的纳秒级全光纤放大器。它基于1064 nm的无源锁模光纤振荡器,其脉冲宽度为28 ps,重复频率为27.7 MHz。采用长度为8 km的单模光纤作为光纤扩展器,其中通过强大的非线性效应(例如自相位调制)引入了新的频率分量,从而将光谱带宽从0.4 nm扩展到了约20 nm。8 km光纤延伸器的群速度色散为-38 ps(nm km)-1,这会将皮秒脉冲的脉冲持续时间延长到1-7 ns。在27.7 MHz的重复频率下,脉冲宽度为1.3 ns时,平均功率为54 W,脉冲宽度为〜5 ns时,平均功率为21 W,其光光转换效率为41.2%和30.1。 % 分别。这款基于无源锁模光纤振荡器和8 km单模光纤扩展器的全光纤放大器能够提供纳秒级脉冲,同时保持数十MHz的超高重复率。

更新日期:2021-01-12
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