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Updated: Aug 21, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Self-compression of ultrashort pulses through ionization-induced spatiotemporal reshaping
Nicholas L Wagner1, Emily A Gibson, Tenio Popmintchev
1JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.
Abstract:
We present the first demonstration of a new mechanism for temporal compression of ultrashort light pulses that operates at high (i.e., ionizing) intensities. By propagating pulses inside a hollow waveguide filled with low-pressure argon gas, we demonstrate a self-compression from 30 to 13 fs, without the need for any external dispersion compensation. Theoretical models show that 3D spatiotemporal reshaping of the pulse due to a combination of ionization-induced spectral broadening, plasma-induced refraction, and guiding in the hollow waveguide are necessary to explain the compression mechanism.

