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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 12 — Dec. 1, 2008
  • pp: 1988–1997

In-line holographic imaging and electron density extraction of ultrafast ionized air filaments

George Rodriguez, Anthony R. Valenzuela, Balakishore Yellampalle, Mark J. Schmitt, and Ki-Yong Kim  »View Author Affiliations


JOSA B, Vol. 25, Issue 12, pp. 1988-1997 (2008)
http://dx.doi.org/10.1364/JOSAB.25.001988


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Abstract

In-line spatial holographic methods are used to image the optical diffraction patterns of ultrafast laser produced plasma filaments in air. Using femtosecond laser pump-probe methods the plasma filament is produced and subsequently probed by a time-delayed probe beam traversing the filament at a right angle. The resulting probe beam image is recorded as a holographic diffraction pattern on a charge coupled device camera as the probe beam is diffracted due to the optical index change caused by the plasma filament. Extraction of the electron density in the filament down to 10 16   cm − 3 is obtained by using the Helmholtz wave equation beam propagation model to simulate the data. By varying the pump-probe optical time delay, a plasma electron recombination time of approximately 250   ps is measured and agrees with our rate equation population kinetics model.

© 2008 Optical Society of America

OCIS Codes
(110.1650) Imaging systems : Coherence imaging
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(260.5210) Physical optics : Photoionization
(100.0118) Image processing : Imaging ultrafast phenomena
(280.5395) Remote sensing and sensors : Plasma diagnostics

ToC Category:
Image Processing

History
Original Manuscript: July 10, 2008
Revised Manuscript: October 7, 2008
Manuscript Accepted: October 8, 2008
Published: November 14, 2008

Citation
George Rodriguez, Anthony R. Valenzuela, Balakishore Yellampalle, Mark J. Schmitt, and Ki-Yong Kim, "In-line holographic imaging and electron density extraction of ultrafast ionized air filaments," J. Opt. Soc. Am. B 25, 1988-1997 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-12-1988

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