Fig. 1: Principle of high-dimensional one-shot optical field compressive sensing.
From: High-dimensional one-shot optical field compressive sensing of structured light
a The schematic experimental setup. The spectropolarimeter consists of a birefringent crystal (BF1), a polarization beam splitter (PBS1), and a homemade two-channel spectrometer. The coded aperture snapshot spectral imager (CASSI) includes a coded mask, an imaging lens L3, an angularly dispersive prism, and a charge-coupled device camera (CCD). CP: checking point; HDM: holed drilled mirror; PBS2: polarization beam splitter; BS1, BS2: beam splitters; M1, M2: reflective mirror; L1, L2: imaging lens; PDO: point-diffraction object; FROG: Frequency-resolved optical gating. b Spectropolarimeter results \({I}_{x}\left(\omega \right)\) and \({I}_{y}\left(\omega \right)\) (top panel) at \(\left({x}_{0},{y}_{0}\right)\), and reconstructed frequency-resolved polarization parameters \({\psi }^{\left({x}_{0},{y}_{0}\right)}\left(\omega \right)\) and \({\varDelta }^{\left({x}_{0},{y}_{0}\right)}\left(\omega \right)\) (bottom panels). Corresponding wavelengths are labeled on top. c CASSI reconstructions for \(x\)- (top row) and \(y\)-polarized (bottom row) point-diffraction holograms at wavelengths of 770 nm (left column), 790 nm (middle column), and 810 nm (right column), with corresponding angular frequencies marked on top. d Point-diffraction holographic reconstruction results for \(x\)-polarized light, including intensity \({I}_{x}(x,y,\omega )\) (top row) and spatial phase profiles \({\varphi }_{x}^{\left(\omega \right)}(x,y)\) (bottom row) at wavelengths of 770 nm (left column), 790 nm (middle column), and 810 nm (right column). Data with normalized intensity <0.1 is neglected. e The 3D spatiotemporal vectorial optical field reconstruction procedure.
