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

Abstract : 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 CS 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 =1.3 ps.
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Submitted on : Thursday, February 14, 2019 - 9:29:12 AM
Last modification on : Tuesday, October 19, 2021 - 4:14:17 PM


  • HAL Id : hal-02018710, version 1


Saïd Idlahcen, Loïc Méès, Claude Roze, Thierry Girasole, Jean-Bernard Blaisot. Time gate, optical layout, and wavelength effects on ballistic imaging. Journal of the Optical Society of America. A, Optics and image science, Optical Society of America, 2009. ⟨hal-02018710⟩



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