Coherent square pulse generation based on continuous wave phase modulation for SSMB

Laser square wave pulse plays an important role in the application of high power optical field. In this work, the modulation phase signal corresponding to the square wave pulse is inversely solved by the method of numerical calculation. And a modified modulation method is proposed, which can generate the coherent square pulse train with constant frequency interval in the frequency domain. It has the potential to provide a solution for the application requirements of high power optical field. In addition, the error analysis of the delay time in the double modulation model is carried out, and the influence of different time delay on the generated square wave pulse deformation is considered qualitatively and quantitatively in one cycle, which provides a theoretical basis and feasibility analysis for the experiment implementation