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Broad bandwidth, infrared light sources have the potential to revolutionizeinertial confinement fusion (ICF) by suppressing laser-plasma instabilities.There is, however, a tradeoff: The broad bandwidth precludes high efficiencyconversion to the ultraviolet, where laser-plasma interactions are weaker.Operation in the infrared could intensify the role of resonance absorption, aneffect long suspected to be the shortcoming of early ICF experiments. Here wepresent simulations exploring the effect of bandwidth on resonance absorption.In the linear regime, bandwidth has little effect on resonance absorption; inthe nonlinear regime, bandwidth suppresses enhanced absorption resulting fromthe electromagnetic decay instability. These findings evince that regardless ofbandwidth, an ICF implosion will confront at least linear levels of resonanceabsorption.

Resonance absorption of a broadband laser pulse