Depth-filtering in common-path digital holographic microscopy
Finkeldey, M. and Göring, L. and Brenner, C. and Hofmann, M. and Gerhardt, N.C.
Volume: 25 Pages: 19398-19407
We demonstrate a method to select different layers in a sample using a low coherent gating approach combined with a stable common-path quantitative phase imaging microscopy setup. The depth-filtering technique allows us to suppress the negative effects generated by multiple interference patterns of overlaying optical interfaces in the sample. It maintains the compact and stable common-path setup, while enabling images with a high phase sensitivity and acquisition speed. We use a holographic microscope in reflective geometry with a non-tunable low coherence light source. First results of this technique are shown by imaging the hardware layer of a standard micro-controller through its thinned substrate. © 2017 Optical Society of America.