Origin and Variation of Image Contrast

n_m

n_s

Analyzer

No
Bias

Wollaston
Prism

Deformed
Wavefront

n_s> n_m
Specimen

Sheared
Wavefront

Intensity

Shear Axis (x)

λ/2

λ/4

0

DIC Specimen Image

x

Bias Retardation: Positive Bias

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