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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Blood Cells Mol Dis. 2008 Apr 1;41(1):10–16. doi: 10.1016/j.bcmd.2008.01.010

Figure 2.

Figure 2

DPM experimental setup. Collimated light from a 514 nm Argon laser is coupled to an inverted microscope (Olympus IX71) equipped with a high numerical aperture 40x objective. An amplitude grating generates multiple diffraction orders containing full spatial information about the sample image. The 0th order beam is low-pass filtered using a pinhole placed at the Fourier plane so that it becomes a plane wave after passing through lens L4. A common-path Mach-Zender interferometer is thus created with the 0th order as the reference beam and the 1st order as the sample beam (inset). Compared to conventional Mach-Zender interferometers, the two beams propagate through the same optical components, which essentially eliminates the phase noise without the need for active stabilization. Figure adapted from [28].