Abstract
The application of digital holographic microscope (DHM) imaging and inspection of fine surface structures, dimensions of which are in the range from units of nanometers up to units of micrometers in optical axis direction, is described in this paper. Accurate results of surface structures measurement, in the case the surface profile height is of three orders range, is achieved by simultaneous processing of optically sectioned image intensity and image phase. Surface profile height is roughly specified by the image intensity and the precise height information is acquired from the image phase. Full width at half maximum of the axial intensity response is adjusted properly for particular specimen by the modification of the spectral function of illumination and by resizing of the incoherent illumination source. It means the intervention into spatial and temporal coherence of the illumination. The content of this paper is the description of imaging characteristics of the DHM for individual illumination modes together with experimental results.
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