Optical phase conjugation in Nd:YVO_4 for acousto-optic detection in scattering media

Jayet, Baptiste; Huignard, J.-P.; Ramaz, François

doi:10.1364/ol.38.001256

Cited by 20 publications

(8 citation statements)

References 8 publications

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“…Gain Media (such as laser crystals) also typically provide very fast OPC but work only for a narrow spectral range. They allow for amplification of the phase-conjugated wave (Feinberg and Hellwarth, 1980) and have been used for imaging in turbid media (Jayet et al, 2013). Three wave mixing is fast and broadband, but is only effective over a very small angular range, yet was used for imaging through turbid media (Devaux et al, 1998).…”

Section: Time Reversal Analog and Digital Phase Conjugation Through mentioning

confidence: 99%

Light fields in complex media: Mesoscopic scattering meets wave control

2017

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The newly emerging field of wave front shaping in complex media has recently seen enormous progress. The driving force behind these advances has been the experimental accessibility of the information stored in the scattering matrix of a disordered medium, which can nowadays routinely be exploited to focus light as well as to image or to transmit information even across highly turbid scattering samples. We will provide an overview of these new techniques, of their experimental implementations as well as of the underlying theoretical concepts following from mesoscopic scattering theory. In particular, we will highlight the intimate connections between quantum transport phenomena and the scattering of light fields in disordered media, which can both be described by the same theoretical concepts. We also put particular emphasis on how the above topics relate to application-oriented research fields such as optical imaging, sensing and communication.

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Section: Time Reversal Analog and Digital Phase Conjugation Through mentioning

confidence: 99%

Light fields in complex media: Mesoscopic scattering meets wave control

2017

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“…There are several known methods to measure ultrasonically modulated light, [19][20][21] and fast detection methods 22,23 are being developed to overcome the tissue dynamics. In experiments presented here, we used a method based on the speckle contrast change for the detection of ultrasonically modulated light.…”

Section: Experimental Measurement Of Fluencementioning

confidence: 99%

Mapping optical fluence variations in highly scattering media by measuring ultrasonically modulated backscattered light

et al. 2014

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Abstract. Knowledge of the local optical fluence in biological tissue is of fundamental importance for biomedical optical techniques to achieve quantification. We report a method to noninvasively measure the local optical fluence in optically inhomogeneous scattering media. The concept is based on two aspects: the local tagging of light using ultrasonic modulation and the photon path reversibility principle. Our method has advantages over known computational-based fluence mapping techniques, for its purely experimental nature and without the requirement of prior knowledge of the optical properties of the medium. We provide a theoretical formalism and validation of the method with experiments in tissue-like phantoms. Further, we combine our method with photoacoustic imaging and compensate the photoacoustic signals for fluence variations in optically inhomogeneous media. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Recently, nonlinear methods with system response latencies of the order of milliseconds have been reported [20,21]. In contrast, DOPC systems reported thus far have response times of the order of hundreds of milliseconds or more [22].…”

Section: Introductionmentioning

confidence: 99%

Focusing through dynamic tissue with millisecond digital optical phase conjugation

Wang¹,

Zhou²,

Brake³

et al. 2015

Optica

209

175

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Digital optical phase conjugation (DOPC) is a new technique employed in wavefront shaping and phase conjugation for focusing light through or within scattering media such as biological tissues. DOPC is particularly attractive as it intrinsically achieves a high fluence reflectivity in comparison to nonlinear optical approaches. However, the slow refresh rate of liquid crystal spatial light modulators and limitations imposed by computer data transfer speeds have thus far made it difficult for DOPC to achieve a playback latency of shorter than ~200 ms and, therefore, prevented DOPC from being practically applied to thick living samples. In this paper, we report a novel DOPC system that is capable of 5.3 ms playback latency. This speed improvement of almost 2 orders of magnitude is achieved by using a digital micromirror device, field programmable gate array (FPGA) processing, and a single-shot binary phase retrieval technique. With this system, we are able to focus through 2.3 mm living mouse skin with blood flowing through it (decorrelation time ~30 ms) and demonstrate that the focus can be maintained indefinitely—an important technological milestone that has not been previously reported, to the best of our knowledge.

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Optical phase conjugation in Nd:YVO_4 for acousto-optic detection in scattering media

Cited by 20 publications

References 8 publications

Light fields in complex media: Mesoscopic scattering meets wave control

Light fields in complex media: Mesoscopic scattering meets wave control

Mapping optical fluence variations in highly scattering media by measuring ultrasonically modulated backscattered light

Focusing through dynamic tissue with millisecond digital optical phase conjugation

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