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Controlling light in scattering media

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Measur<strong>in</strong>g the transmission matrix K<br />

CCD<br />

Reference<br />

Part<br />

1) Display vector U k on the controlled<br />

part<br />

P<br />

x40<br />

AN : 0.75<br />

x20<br />

AN : 0.5<br />

Controlled Part<br />

2) Shift the global phase of the<br />

reference and take 4 speckle image<br />

Laser 532nm<br />

Observation<br />

W<strong>in</strong>dow<br />

sample<br />

P<br />

D<br />

3) Retrieve the amplitude and phase of<br />

the speckle due to the U k (<strong>in</strong>clud<strong>in</strong>g<br />

reference) E out .E ref<br />

Repeat N times<br />

L<br />

L<br />

P<br />

SLM<br />

Measured<br />

TM<br />

K obs = K<br />

× S ref<br />

exact TM<br />

Diagonal<br />

matrix

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