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18 August 2014 Dual-wavelength diffraction phase microscopy for real-time dispersion measurement
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We present a dual-wavelength diffraction phase microscopy (DW-DPM) that obtains the wavelength-differentiated dual phase images in a single shot of interference fringe acquisition. For this, the diffraction phase microscopy (DPM) system was constructed with a transmission grating and a spatial filter that form a common-path interferometer. With a light source of two spectral components, a different diffraction order of the grating was utilized for each. This resulted in a combined but distinguishable interference pattern to be acquired by a single image sensor. In this research, our dualwavelength phase imaging scheme was applied to simultaneously measure dispersion of a sample. Stable and reliable measurements could be performed in a single shot due to the robust structure of our DW-DPM system.
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Mohammad Reza Jafarfard, Behnam Tayebi, and Dug Young Kim "Dual-wavelength diffraction phase microscopy for real-time dispersion measurement ", Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 92030T (18 August 2014);

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