Fast wavefront adaptive holography in Nd:YVO4 for ultrasound optical tomography imaging
Résumé
Several approaches exist to perform acousto-optic imaging of multiple-scattering media such as biological samples. Up to now, most of the coherent detection methods use holographic setup based on photore-fractive crystals such as BSO or SPS. One of the issue of these techniques is the moderate response time compared to the speckle decorrelation time in biological sample. We introduce a new approach for the holographic detection based on two-wave mixing in a Nd:YVO 4 gain medium enabling us to perform a fast wavefront adaption (50 µs) of the speckle field from a multiple-scattering sample.
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