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