The state of the art of investigations on élamentation of a high-power femtosecond laser radiation in transparent media is reviewed. The physical picture of this phenomenon is presented and its relation to the fundamental concepts of nonlinear optics and practical applications is demonstrated. Experimental and theoretical methods are brieêy considered and laser radiation parameters in the case of élamentation are given. The review can be of interest both
The feasibility of a microwave waveguide made of plasma channels under laser pulse filamentation is discussed. The necessary channel bunch configuration is achieved by initial intensity modulation of a femtosecond pulse. Estimations are given for wavelength of the microwave radiation and for parameters of the plasma channels configuration.
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