Fig. 1.

(a) Setup used for short-coherence off-axis holographic microscopy. A grating in the reference arm introduces a controlled pulse-front-tilt between reference and sample arms, causing short-coherence pulses to overlap over their entire field-of-view despite the finite off-axis angle (lower right inset), in contrast to the normal non-tilted situation (upper right inset). The zero-order reflection is blocked by slightly tilting the grating vertically and placing a beam block (BB) in the returning beam. BS: beam splitter, PCF: photonic crystal fiber, CCD: CCD camera. (b) Hologram of a test sample, measured without pulse front tilt in the reference beam. The limited overlap leads to a strongly reduced field-of-view. (c) Hologram of the same sample, measured with pulse front tilt. A good contrast image is obtained across the entire field-of-view.