Frequency-domain interferometer for measuring the phase and amplitude of a femtosecond pulse probing a laser-produced plasma
- 1 December 1994
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 19 (23) , 1997-1999
- https://doi.org/10.1364/ol.19.001997
Abstract
A frequency-domain interferometer for probing the variations of the dielectric constant of a plasma with sub-100-fs temporal resolution and λ/2000 phase resolution is described. Imaging the plasma on the entrance slit of a spectrograph provides spatial resolution along a diameter of the focal spot. The technique is used to map out the expansion of the critical density surface of a femtosecond laser-produced plasma with subnanometer spatial resolution along the laser axis.Keywords
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