Title :
Real-time 3-D holographic imaging using photorefractive media including multiple-quantum-well devices
Author :
Jones, R. ; Barry, N.P. ; Hyde, Sam C W ; Tziraki, Mary ; Dainty, J.C. ; French, Paul M W ; Nolte, D.D. ; Kwolek, K.M. ; Melloch, Michael R.
Author_Institution :
Dept. of Phys., Imperial Coll. of Sci., Technol. & Med., London, UK
Abstract :
We discuss a real-time coherence gated three-dimensional (3-D) imaging system, based on photorefractive holography with ultrashort pulses, which has been applied to imaging through turbid media with a view to developing biomedical instrumentation. Sub-100-μm depth-resolved images of 3-D objects embedded in a scattering medium have been obtained. Using a long integration time in rhodium-doped barium titanate (Rh:BaTiO4), an image of a test chart has been obtained through 16 mean-free paths of scattering medium. Real-time depth-resolved imaging through 13 mean free paths of scattering medium has been demonstrated using a fast response time (<0.4 ms) photorefractive multiple quantum well device. This latter system can acquire depth-resolved images direct to video with no requirement for frame grabbing or signal processing. We discuss the tradeoffs and limitations of these photorefractive media for this application
Keywords :
barium compounds; biomedical imaging; high-speed optical techniques; holography; image resolution; infrared imaging; light scattering; photorefractive materials; rhodium; semiconductor quantum wells; 0.4 ms; BaTiO3:Rh; Rh:BaTiO4; biomedical instrumentation; frame grabbing; long integration time; mean-free paths; multiple-quantum-well devices; photorefractive holography; photorefractive media; real-time 3D holographic imaging; real-time coherence gated 3D imaging system; real-time depth-resolved imaging; resolved images; rhodium-doped barium titanate; scattering medium; signal processing; test chart image; turbid media imaging; ultrashort pulses; Barium; Biomedical imaging; Biomedical measurements; Holography; Particle scattering; Photorefractive effect; Photorefractive materials; Real time systems; Testing; Titanium compounds;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.686743
