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Article Dans Une Revue Optics Letters Année : 2017

Controlling nonlinear instabilities in Bessel beams through longitudinal intensity shaping

Résumé

During ultrafast laser pulse propagation in dielectrics, the nonlinear generation of new spatial frequencies can be deleterious to reach high intensities and to generate uniform plasma channels. In this context, diffraction-free Bessel beams have attracted major recent interest because of their enhanced stability when compared to conventional Gaussian beams. However, Bessel beams can still suffer from significant modulation instability arising from noise-induced nonlinear four-wave mixing (FWM). In this Letter we report control of the nonlinear instability growth by shaping the longitudinal intensity profile of the incident field. Our results show that tailored longitudinal intensity shaping of a nondiffracting Bessel beam can strongly reduce FWM-induced oscillations and stabilize nonlinear propagation at ablation-level intensities.

Dates et versions

hal-02392598 , version 1 (04-04-2020)

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Ismail Ouadghiri Idrissi, John Michaël Dudley, François Courvoisier. Controlling nonlinear instabilities in Bessel beams through longitudinal intensity shaping. Optics Letters, 2017, 42 (19), pp.3785-3788. ⟨10.1364/OL.42.003785⟩. ⟨hal-02392598⟩
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