Abstract
We realized the palm-size (Dimension: L56 mm × W69 mm × H43 mm, Weight: 500 g) wide-field
spectroscopic imager based on the proposed imaging-type 2-dimensional Fourier spectroscopy. We
installed the variable phase-filter at optical Fourier transform plane of infinity corrected optical systems.
Because of the wavefront-division-type phase-shift-interferometer, the proposed near-common-path
interferometer between objective beams has strong robustness for mechanical vibrations. But destructive
interference phenomena in accordance with phase-shift value were occurred between adjacent singlebright
points. To improve visibilities especially for low spatial frequencies of wide-field mid-infrared
images, we also proposed the conjugate-plane multi-slit superimpose method for thinning out adjacent
single-bright points. Thereby, we could demonstrate the omnidirectional spectroscopic imaging with
50-degree view angle by a hyperboloidal mirror. In this paper, we clarified the optical phenomenon that
results in phase-shift destructions between adjacent single-bright points. And then, we demonstrated
feasibilities of wide-field spectroscopic imaging in visible and mid-infrared light region.
