In this paper, we theoretically present a novel method applying nonlinear amplifying loop mirror to generate
square pulse. From our analysis, the generated square pulse is steady and flat. We give the criteria for steady
power and point out that there would be a stable region around the certain steady power. With the steady power
given, the temporal width and other properties of square pulse will be determined. We also find that due to
the steady power and stable region, the laser could give a multi-square-pulse output by adjusting the controlling
light. An example of initially Gaussian pulse is discussed to support the idea. By adjusting transmission
characteristics of the nonlinear amplifying loop mirror we will get different steady power, and then we can
control power, temporal width and other properties of the generated square pulse by tuning the controlling light
and choosing proper optical components. We also give a restriction for choosing optical components.
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