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We experimentally demonstrate that high energy femtosecond laser pulses can be compressed using nonlinear propagation in gas-filled planar hollow waveguides. A stability analysis provides guidelines for up-scaling the compressible pulse energy without spatial beam-breakup.
Several concepts for the compression of ultrashort laser pulses to the few-cycle regime were recently proposed. Most promising among these are filamentation in gases as well as nonlinear propagation inside gas-filled hollow-core fibres. However, both methods are limited in terms of the accessible output pulse energy (typically below ~1 mJ), either by the onset of multiple filamentation for the first...
We experimentally demonstrate that high energy ultrashort pulses can be compressed through self-phase-modulation in hollow planar waveguides. The beam is guided in one transverse dimension and propagates free in other, allowing scalability to higher energies.
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