Fig. 1. Schematic of white-light common-path off-axis digital holographic microscope based on grating diffraction

Fig. 2. Spectrum of the halogen lamp used in the system

Fig. 3. Experimental results. (a) Hologram; (b) enlarged part of the hologram shown in the rectangle; (c) reconstruction phase image; (d) three-dimensional thickness profile of the micro bead; (e) thickness profile of the micro bead along the white line in (c)

Fig. 4. Analysis of spatiotemporal noise of the system. (a) A optical path difference image of no-sample; (b) histogram of the spatial noise; (c) histogram of the temporal noise