The single wavelength off-axis reflection digital holographic microscopy (DHM) can be applied in micron optical
tomography measurement through the pre-magnification method. The pre-magnifying surface profile of the object is
imaged by the lens placed in front of the object to be measured, and then is recorded by the CCD camera. The
Reconstructed image can be got through Fresnel Diffraction calculation, the 3D surface shape information of the object
was shown after the phase filtering and unwrapping process to the reconstruction image. The result in this experiment
proves that off-axis reflection digital holographic microscopy can be applied to actual measurement of micron object, to
achieve the tomography without touching or breaking the object.
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