Fig. 6: The experiment setup.
From: Observation of Berry curvature in non-Hermitian system from far-field radiation
The focal lengths of lenses L1, L2, L3, L4, L5, L6, and L7 are 300, 200, 300, 75, 300, 200, and 125 mm, respectively. AOTF acoustic-optic tunable filter, POL polarizer, QWP quarter-wave plate, BS beam splitter, RFP rear focal plane, Obj objective lens (50X and NA = 0.95), CCD charge-coupled device.
