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We demonstrate an extended depth of focus (DOF) for optical coherence tomography (OCT) using a Bessel-like higher order fiber mode. The DOF is enhanced by 7× and the lateral resolution is about 10 μm.
A spectrally broadened and compressed fraction of the 30 fs JETI-pulses is utilized for imaging the laser-plasma interaction with 6 fs time resolution. In case of LWFA the direct visualization of the plasma wave became possible.
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