A Novel Scheme for High-Intensity Ultrashort Pulse Generation
We analyze laser pulse propagation in a hollow waveguide filled with noble gas, at intensities where tunnel ionization occurs. A parameter range is identified where self-defocusing by the plasma lens is compensated by the guiding properties of the hollow waveguide. The plasma-induced self phase modulation introduces a strong spectral broadening and a nearly linear spectral chirp. Compensation of the linear component of the chirp yields sub-4-fs pulses with energies of a few milijoules.
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