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Title: Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate

Abstract

Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.

Inventors:
 [1]
  1. Golden, CO
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
871466
Patent Number(s):
5738101
Application Number:
08/588171
Assignee:
Regents of University of California (Los Alamos, NM)
Patent Classifications (CPCs):
G - PHYSICS G02 - OPTICS G02F - DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING
A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61B - DIAGNOSIS
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
optical; imaging; turbid; media; degenerate; four-wave; mixing; correlation; time; gate; demonstrated; apparatus; method; detecting; ballistic; snake; light; rejecting; unwanted; diffusive; structures; highly; scattering; described; dfwm; doubled; yag; laser; rhodamine; 590; provide; ultrafast; discriminate; undergone; multiple; lost; memory; medium; images; obtained; cross-hair; pattern; suspensions; milk; water; opaque; naked; eye; demonstrates; utility; detection; mammography; discussed; turbid media; yag laser; four-wave mixing; highly scattering; optical imaging; scattering medium; scattering media; time gate; mixing correlation; degenerate four-wave; correlation time; wave mixing; /600/356/

Citation Formats

Sappey, Andrew D. Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate. United States: N. p., 1998. Web.
Sappey, Andrew D. Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate. United States.
Sappey, Andrew D. Tue . "Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate". United States. https://www.osti.gov/servlets/purl/871466.
@article{osti_871466,
title = {Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate},
author = {Sappey, Andrew D},
abstractNote = {Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {4}
}

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Works referenced in this record:

Time-Gated Imaging with Nonlinear Optical Raman Interactions
journal, January 1993


Time-gated imaging through scattering media using stimulated Raman amplification
journal, January 1991


Optical phase conjugation in laser dyes
journal, May 1992


Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor
journal, January 1978


Two-dimensional imaging through diffusing media using 150-fs gated electronic holography techniques
journal, January 1991