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Published August 30, 2006 | Published
Book Section - Chapter Open

Femtosecond imaging with digital holography

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.

Additional Information

© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors wish to thank Zhiwen Liu and Theodor W. Hänsch for helpful discussions. This research was supported by the Defense Advanced Research Projects Agency Center for Optofluidic Integration. Funding for M. Centurion was provided through the Center for the Physics of Information as part of the Caltech Information Science and Technology initiative.

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