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17 February 2010Different generation regimes of mode-locked all-positive-dispersion all-fiber Yb laser
Different generation modes of all-positive-dispersion all-fibre Yb laser mode-locked due to effect of non-linear
polarization evolution are investigated. For the first time we realized in the same laser both generation of single
picoseconds pulse train and a newly observed lasing regime where generated are picosecond wave-packets, each being a
train of femtosecond sub-pulses. Using both experimental results and numerical modeling we discuss in detail the
mechanisms of laser mode-locking and switching of generation regimes and show a strong dependence of output laser
characteristics on configuration of polarization controllers. A good qualitative agreement between experimental results
and numerical modeling is demonstrated.