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Digital micromirror device (DMD) serves in a significant part ofcomputational optical setups as a means of encoding an image by the desiredpattern. The most prominent is its usage in the so-called single-pixel cameraexperiment. This experiment often requires an efficient and homogenouscollection of light from a relatively large chip on a small area of an opticalfiber or spectrometer slit. Moreover, this effort is complicated by the factthat the DMD acts as a diffractive element, which causes severe spectralinhomogeneities in the light collection. We studied the effect of lightdiffraction via a whiskbroom hyperspectral camera in a broad spectral range.Based on the knowledge, we designed a variety of different approaches to lightcollection. We mapped the efficiency and spectral homogeneity of each of theconfiguration - namely its ability to couple the light into commerciallyavailable fiber spectrometers working in the visible and IR range (up to 2500nm). We found the integrating spheres to provide homogeneous light collection,which, however, suffers from very low efficiency. The best compromise betweenthe performance parameters was provided by a combination of an engineereddiffuser with an off-axis parabolic mirror. We used this configuration tocreate a computational microscope able to carry out hyperspectral imaging of asample in a broad spectral range (400-2500 nm). We see such a setup as an idealtool to carry out spectrally-resolved transmission microscopy in a broadspectral range.

Collection of micromirror-modulated light in the single-pixel broadband hyperspectral microscope