Fig. 1: Atom-based polarization holography. | Communications Physics

Fig. 1: Atom-based polarization holography.

From: All-optical polarization-filtered subwavelength imaging in microwave regime via atom-based polarization holography

Fig. 1

a Experimental setup of APH. A tunable PHLF is generated in a vapor cell through holographic interference of two asymmetrically polarized recording beams. A probe light passes through the vapor cell along the z-axis and is diffracted by the holographically induced atomic structure. The diffracted probe field is detected with a photodetector for all-optical polarization imaging of MW fields. P polarizer, H half-wave plate, Q quarter-wave plate, PS polarization splitter, M mirror, VC vapor cell, DM dichroic mirror, PD photodetector. b Constructed four-level atomic system within PHLF. c Principle of photoinduced atomic anisotropy. Linearly polarized probe light can be decomposed into two circularly polarized components with equal intensity and opposite handedness. When the recording light field is elliptically polarized, absorption of RCP and LCP components of probe light becomes different for the two-photon pumped atomic medium, resulting in photoinduced atomic anisotropy.

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