Abstract: The method of analysis of supermodes composition in laser with short-term periodic modulation of losses - nonstationary supermodes - has been suggested and investigated. This method is based on the property of invariance supermode to Fourier-transformation. In experiment this is displayed by a regular modulation of integral spectrum of generation such laser in case, when individual supermode is generated. Realization of method makes possible to obtain detailed data about dynamics of generation laser and also to solve problems of control the parameters of characteristic for a given laser high-energy ultrashort pulses.!12
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