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Spectral red-shifting of high power laser pulses propagating throughunderdense plasma can be a source of ultrashort mid-infrared (MIR) radiation.During propagation, a high power laser pulse drives large amplitude plasmawaves, depleting the pulse energy. At the same time, the large amplitude plasmawave provides a dynamic dielectric response that leads to spectral shifting.The loss of laser pulse energy and the approximate conservation of laser pulseaction imply that spectral red-shifts accompany the depletion. In this paper,we investigate, through simulation, the parametric dependence of MIR generationon pulse energy, initial pulse duration, and plasma density.

Pulsed Mid-infrared Radiation from Spectral Broadening in Laser Wakefield Simulations