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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: 1995–2004

Time gate, optical layout, and wavelength effects on ballistic imaging

Saïd Idlahcen, Loïc Méès, Claude Rozé, Thierry Girasole, and Jean-Bernard Blaisot  »View Author Affiliations

JOSA A, Vol. 26, Issue 9, pp. 1995-2004 (2009)

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A method to distinguish a hidden object from a perturbing environment is to use an ultrashort femtosecond pulse of light and a time-resolved detection. To separate ballistic light containing information on a hidden object from multiscattered light coming from the surrounding environment that scrambles the signal, an optical Kerr gate can be used. It consists of a carbon disulfide ( C S 2 ) cell in which birefringence is optically induced. An imaging beam passes through the studied medium while a pump pulse is used to open the gate. The time-delayed scattered light is excluded from measurements by the gate, and the multiple-scattering scrambling effect is reduced. In previous works, the two beams had the same wavelength. We propose a new two-color experimental setup for ballistic imaging in which a second harmonic is generated and used for the image, while the fundamental is used for gate switching. This setup allows one to obtain better resolution by using a spectral filtering to eliminate noise from the pump pulse, instead of a spatial filtering. This new setup is suitable for use in ballistic imaging of dense sprays, multidiffusive, and large enough to show scattered light time delays greater than the gate duration ( τ = 1.3 ps ) .

© 2009 Optical Society of America

OCIS Codes
(190.3270) Nonlinear optics : Kerr effect
(290.4210) Scattering : Multiple scattering
(320.7100) Ultrafast optics : Ultrafast measurements
(110.0113) Imaging systems : Imaging through turbid media
(100.0118) Image processing : Imaging ultrafast phenomena

ToC Category:
Ultrafast Optics

Original Manuscript: April 9, 2009
Revised Manuscript: July 11, 2009
Manuscript Accepted: July 12, 2009
Published: August 20, 2009

Saïd Idlahcen, Loïc Méès, Claude Rozé, Thierry Girasole, and Jean-Bernard Blaisot, "Time gate, optical layout, and wavelength effects on ballistic imaging," J. Opt. Soc. Am. A 26, 1995-2004 (2009)

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