Kavli Affiliate: Xiang Zhang
| First 5 Authors: Xiang Zhang, Haobin Zheng, Kangrui Chang, Yong Shen, Yongzhuang Zhou
| Summary:
Due to the necessity of making a series of fine adjustments after
mode-locking in most experiments for preparing soliton molecules, the
repeatability of the preparations remains a challenge. Here, we propose a novel
all-polarization-maintaining erbium-doped fiber laser that utilizes a nonlinear
amplifying loop mirror for mode-locking and features a linear structure. This
laser can stably output soliton molecules without any additional adjustment
once the mode-locking self-starts. It can achieve all-optical switching to
single-pulse operation through changing the pumping power, making it suitable
for studying the mechanism of soliton molecule bond rupture. In addition,
multi-pulse operation can also be achieved. Compared to the single-pulse state,
this laser is operated in the multi-pulse state at a lower pumping power level,
in contrast to previous methods that relied on increasing pumping power to
generate multi-pulses. As a result, these multi-pulses are not susceptible to
spectral distortion caused by nonlinear effects and maintain pulse stability
close to that of the single-pulse. Furthermore, as the pumping power decreases,
a peak with periodic intensity variation appears in the spectral center of both
the single-pulse state and multi-pulse states. Combined with the experimental
facts, we propose a multistability model to explain this phenomenon. With its
ability to switch between soliton molecule, soliton, and multi-pulse states,
this flexible laser can serve as a versatile toolbox for studying soliton
dynamics.
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