Abstract
The performance of seed laser source will have a great impact on the output pulse quality of the master oscillator power amplifier (MOPA) system. Here, we report the influence of the soliton vector features on the pulse uniformity in an all-fiber MOPA configuration. We demonstrated that, although the intensity of the dissipative soliton seed source is uniform, the intensity of the output pulse train from the MOPA will show fluctuations if the soliton polarization state is not locked, i.e., polarization-rotating vector soliton. It is found that the appearance of non-uniform pulse intensity is caused by the combination of the polarization instability and the polarization dependent gain in the polarization maintaining fiber amplifier. The obtained results indicate that the polarization evolution of seed pulsed source is critical to generation of stable pulse train from the MOPA, and also might be useful to the communities dealing with solitons and high-power pulsed fiber lasers.
Highlights
High power, ultrashort pulse fiber laser technologies have attracted much attention owing to their wide applications in scientific and industrial fields such as ultrafast optics exploration, biomedicine, and laser micromachining [1]–[4]
The dissipative soliton (DS) formation in normal dispersion fiber laser was proposed to enhance the pulse stability and energy [10]–[11], the output pulse energy is still limited to be the order of nJ, which is insufficient for some practical applications
The results demonstrated that the vector soliton characteristics of the seed source need to be considered in the master oscillator power amplifier (MOPA) system, which is beneficial for achieving the stable pulse train from the MOPA
Summary
Ultrashort pulse fiber laser technologies have attracted much attention owing to their wide applications in scientific and industrial fields such as ultrafast optics exploration, biomedicine, and laser micromachining [1]–[4]. The passive mode-locking is regarded as an efficient method to generate the ultrashort pulse from fiber lasers [5]–[7]. Owing to the nonlinear effects induced pulse instability [8]–[9], the direct output of high-power ultrashort pulse from a mode-locked fiber oscillator remains a challenging task. The output energy of ultrashort pulse with MOPA system is easy to reach the micro-joule levels [17], [18], which greatly extends the range of application fields
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