Abstract
A nanosecond square pulse fiber laser based on the nonlinear amplifying loop
mirror (NALM) is numerically analyzed by the nonlinear Schr¨odinger equation. The
fiber cavity with a NALM has a tendency to provide pulse shaping effect with
nonlinearity increasing in the NALM, and the nanosecond square pulse is generated by
the pulse shaping effect. The numerical results show that the stable square pulse
can be obtained when the parameters of the NALM are chosen appropriately. The
generated square pulses have flat top and no internal structure.
© 2011 Chinese Optics Letters
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