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We present a method for constructing multiphase excitations in the generallynon-integrable system of warm fluid equations describing plasma oscillations.It is based on autoresonant excitation of nonlinear electron plasma waves byphase locking with small amplitude chirped-frequency ponderomotive drives. Wedemonstrate the excitation of these multiphase waves by performing fullynonlinear numerical simulations of the fluid equations. We develop a simplifiedmodel based on a weakly nonlinear analytical theory by applying Whitham'saveraged Lagrangian procedure. The simplified model predictions are in goodagreement with the results from the warm fluid simulations. Such autoresonantlyexcited multiphase waves form coherent quasicrystalline structures, which canpotentially be used as plasma photonic or accelerating devices. Finally, wediscuss the laser parameters required for the autoresonant excitation ofnonlinear waves in a plasma.

Multiphase nonlinear electron plasma waves