Coherence-based imaging through turbid media by use of degenerate four-wave mixing in thin liquid-crystal films and photorefractives

Academic Article


  • We describe a coherence-based imaging technique based on degenerate four-wave mixing in two materials. First, a 45°-cut BaTiO3 crystal was used as a self-pumped phase conjugator to obtain depthresolved images through a 4 mean-free-path (mfp) scattering media. In addition, an HITC dye-doped K15 liquid-crystal layer was used to provide single-shot image acquisition through a 2 mfp scattering media. This technique can be used to provide instantaneous (single-pulse), depth-resolved, twodimensional images of the internal structure of scattering materials. Potential applications of this technique include subsurface imaging of biomedical tissue and nondestructive evaluation of composite materials. © 1998 Optical Society of America.
  • Published In

  • Applied Optics  Journal
  • Digital Object Identifier (doi)

    Author List

  • Brown D; Fleurov VB; Carroll P; Lawson CM
  • Start Page

  • 5306
  • End Page

  • 5312
  • Volume

  • 37
  • Issue

  • 22