Optical phase conjugation by dynamic holography for wavefront restoration in turbid media
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Identificadores
URI: http://hdl.handle.net/10902/25120DOI: 10.1117/12.842179
ISSN: 0277-786X
ISSN: 1996-756X
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Ortega Quijano, Noé; Fanjul Vélez, Félix; Salas García, Irene; Romanov, Oleg G.; Gorbach, Dmitry Vladislavovich; Tolstik, Alexei L.; Arce Diego, José LuisFecha
2010-02-22Derechos
© 2010 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Publicado en
Proceedings of SPIE, 2010, 7562, 75620A
Optical Interactions with Tissues and Cells XXI, San Francisco, California 2010
Editorial
SPIE Society of Photo-Optical Instrumentation Engineers
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Palabras clave
Optical phase conjugation
Dynamic holography
Four-wave mixing
Kerr medium
FDTD
Turbid media
Resumen/Abstract
Optical Phase Conjugation is a non-linear optical phenomenon that generates a phase conjugate replica of an incident beam. It has been widely used to suppress the effects of aberrations in optical systems such as resonators or imagetransmitting optical fibers. In this work, the possibility of using optical phase conjugation as a means of suppressing the effect of scattering in turbid media is analyzed, with the final aim to apply it to biological tissues. Firstly, light propagation through a slab representing a turbid sample was calculated by solving Maxwell's equations with the Finite-Difference Time-Domain method, in order to preserve all the information about the phase and coherence of the wavefront. The non-linear process that takes place within the phase conjugation mirror is described by coupledwave theory. A set of simulations was performed, and the results confirm the feasibility of using this effect to compensate the effect of scattering in turbid media. Subsequently, an experimental set-up was performed. In order to obtain a phase conjugation mirror, degenerate fourwave mixing was achieved by a real-time volume holography configuration. The pulsed laser source was a Nd3+:YAG laser at its second-harmonic (532nm). An ethanol solution of Rhodamine 6G was used as a non-linear medium. A lipidbased scattering sample was obtained by a solution of homogenized milk and distilled water, which provided us with an appropriate tissue phantom. The experimental results demonstrate scattering suppression, and constitute some preliminary measurements of an effect with a promising potential for a wide range of applications.