Abstract
We report numerical and experimental studies of dissipative-soliton-resonance (DSR) in a fiber laser with a nonlinear optical loop mirror. The DSR pulse presents temporally a flat-top profile and a clamped peak power. Its spectrum has a rectangle profile with characteristic steep edges. It shows a unique behavior as pulse energy increases: The rectangle part of the spectrum is unchanged while the newly emerging spectrum sits on the center part and forms a peak. Experimental observations match well with the numerical results. Moreover, the detailed evolution of the DSR pulse compression is both numerically and experimentally demonstrated for the first time. An experimentally obtained DSR pulse of 63 ps duration is compressed down to 760 fs, with low-intensity pedestals using a grating pair. Before being compressed to its narrowest width, the pulse firstly evolves into a cat-ear profile, and the corresponding autocorrelation trace shows a crown shape, which distinguishes itself from properties of other solitons formed in fiber lasers.
Highlights
As being continuously broadened with increasing pump, the DSR pulses are normally heavily chirped
As the DSR has shown great potential for achieving large pulse energy and nanosecond pulses, a more detailed study of the compressibility of much broader square DSR pulses is highly desirable for better investigating its practical application as ultrafast light resources
We report an investigation of DSR generation in an all-normal-dispersion Yb-doped fiber laser (YDF) mode-locked by a NOLM
Summary
While increasing the dispersion compensation, the compressed pulse gradually develops into a cat-ear profile with high spikes at both edges and corresponds to a crown shape autocorrelation trace [β2 = − 2.4 ps[2], Fig. 4(a,b)]. There are clear differences between these two pulses: (1) To deal with excessive nonlinear phase accumulation, giant-chirp oscillators exploit the properties of the giant-chirp pulse and seek to reduce the peak intensity by integrating long passive fibers (extending from tens of meters to kilometers) in the resonators so that the pulse duration is significantly increased, whereas in the case of the dissipative-soliton-resonance in normal dispersion fiber lasers, as mentioned above, the pulse breaking are prevented by inducing strong peak-power-clamping effect of the sinusoidal saturable absorbers. The demonstrated compressibility of the flat-top DSR pulse would considerably improve its usability as an ultrafast resource
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