Third-order-dispersion-managed nonlinear amplification enabling pedestal-eliminated and re-compressed, 5-cycle, 77-kW pulses from an all-fiber system

Le résumé fourni par la source

Group velocity dispersion (GVD) compensation is a classical method for pulse compression. However, as the pulse shortens down to several cycles, the adverse impacts due to higher-order dispersions will become significant. Among them, the lowest third-order dispersion (TOD) is most readily encountered in practice. In this paper, we intend to explore such impacts due to the TOD as well as their elimination using all-fiber management. A figure-of-9 (F-9) all-polarization-maintaining fiber (PMF) laser is constructed to produce robust pulses with a duration of ∼1.49 ps, which are then further amplified with spectrally nonlinear broadening. With precise GVD compensation through the amplifier, the pulses can be compressed down to ∼46 fs in duration but are meanwhile accompanied by strong pedestals. If the TOD is further managed by introducing an appropriate amount of negative TOD fiber, it is found that the pulses can be re-compressed down to a much shorter duration of ∼26 fs (5 cycles). Even more strikingly, the pulse pedestals are also eliminated almost completely. This is the first time exploring TOD management for pulse cleaning and recompression in an all-fiber system seeded with an F-9 PMF laser, to the best of our knowledge. Our proposed system largely relieves the dependence on how short the pulse can be generated from a laser oscillator. Whereas external fiber engineering is just possible to convert a general picosecond pulse into a temporally clean enough, few-cycle, tens-of-kilowatt peak-power one that is typically challenging to obtain directly.

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