Depth-resolved holography through turbid media using photorefraction

Author

Hyde, Sam C W ; Jones, Richard ; Barry, Nick P. ; Dainty, J.C. ; French, Paul M W ; Kwolek, K.M. ; Nolte, David D. ; Melloch, M.R.

Author_Institution

Dept. of Phys., Imperial Coll. of Sci., Technol. & Med., London, UK

Volume

2

Issue

4

fYear

1996

fDate

12/1/1996 12:00:00 AM

Firstpage

965

Lastpage

975

Abstract

A technique based on photorefractive holography for imaging objects obscured by a scattering medium is presented. Using ultrashort pulse illumination, depth-resolved whole-field images of three dimensional objects embedded in scattering media have been obtained. Bulk photorefractive crystals and photorefractive multiple quantum-well (MQW) devices have been investigated as the hologram recording element. Images have been obtained through media of up to 16 scattering mean free paths with a system based on bulk rhodium-doped barium titanate (Rh:BaTiO₃). Using MQW devices, a real-time image acquisition (<0.4 ms) has been demonstrated when imaging through eight scattering mean free paths. The relative merits of photorefractive holography are discussed, including its potential to provide a higher dynamic range of detection than traditional photographic film based or electronic holography. This could be important for in vivo imaging through biological tissue

Keywords

barium compounds; biomedical imaging; holography; infrared imaging; laser applications in medicine; light scattering; photorefractive effect; rhodium; semiconductor quantum wells; turbidity; BaTiO₃:Rh; biological tissue; bulk photorefractive crystals; bulk rhodium-doped barium titanate; depth-resolved holography; depth-resolved whole-field images; higher dynamic range of detection; hologram recording element; imaging; in vivo imaging; near IR radiation; photorefraction; photorefractive holography; photorefractive multiple quantum-well devices; real-time image acquisition; scattering mean free paths; scattering medium; three dimensional objects; turbid media; ultrashort pulse illumination; Barium; Crystals; Dynamic range; Holography; In vivo; Lighting; Particle scattering; Photorefractive materials; Quantum well devices; Titanium compounds;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/2944.577323

Filename

577323