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Manipulating at will the propagation dynamics of high power laser pulses is along-standing dream whose accomplishment would lead to the control of aplethora of fascinating physical phenomena emerging from laser-matterinteraction. The present work represents a significant step towards such anideal control by manipulating the nonlinear optical properties of the gasmedium at the quantum level. This is accomplished by engineering the intenselaser pulse experiencing filamentation at the subcycle level with a relativelyweak (about 1%) third-harmonic radiation. The control results from quantuminterferences between a single and a two-color (mixing the fundamentalfrequency with its 3rd harmonic) ionization channel. This mechanism, whichdepends on the relative phase between the two electric fields, is responsiblefor wide refractive index modifications in relation with significantenhancement or suppression of the ionization rate. As a first application, wedemonstrate the production and control of an axially modulated plasma channelthat could be used for quasi-phase matched laser wakefield acceleration.

Subcycle engineering of laser filamentation in gas by harmonic seeding