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Proceedings Paper

Femtosecond imaging with digital holography
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Paper Abstract

We describe a holographic technique capable of sampling dynamic events at 150 femtosecond time resolution. We apply the technique to the study of the nonlinear propagation of high energy pulses through gas and condensed media. The holograms are recorded as a digitized image from a CCD camera and reconstructed numerically to retrieve the refractive index change during the nonlinear optical process. We show dramatic differences in the pulse propagation characteristics depending on the strength of the nonlinear coefficient of the material and it's time response. Both positive and negative index changes have been measured in different media. The holographic technique allows us to distinguish the very fast positive index changes that are generally attributable to the Kerr nonlinearity from the negative index changes that result from free electrons generated by multiphoton ionization.

Paper Details

Date Published: 30 August 2006
PDF: 9 pages
Proc. SPIE 6311, Optical Information Systems IV, 63111K (30 August 2006); doi: 10.1117/12.688468
Show Author Affiliations
Ye Pu, California Institute of Technology (United States)
Martin Centurion, California Institute of Technology (United States)
Demetri Psaltis, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6311:
Optical Information Systems IV
Bahram Javidi; Demetri Psaltis; H. John Caulfield, Editor(s)

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