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

Patent ·
OSTI ID:871466
 [1]
  1. Golden, CO
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM
DOE Contract Number:
W-7405-ENG-36
Assignee:
Regents of University of California (Los Alamos, NM)
Patent Number(s):
US 5738101
Application Number:
08/588171
OSTI ID:
871466
Country of Publication:
United States
Language:
English

References (8)

Optical phase conjugation in laser dyes journal May 1992
Time-Gated Imaging with Nonlinear Optical Raman Interactions journal January 1993
Imaging of a translucent object hidden in a highly scattering medium from the early portion of the diffuse component of a transmitted ultrafast laser pulse journal January 1992
Imaging objects hidden in highly scattering media using femtosecond second-harmonic-generation cross-correlation time gating journal January 1991
Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor journal January 1978
Optical imaging through turbid media with a degenerate four wave mixing correlation time gate journal January 1994
Two-dimensional imaging through diffusing media using 150-fs gated electronic holography techniques journal January 1991
Time-gated imaging through scattering media using stimulated Raman amplification journal January 1991

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/600/356/
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