Optical scanning holography system

A geometric phase in-line scanning holography system, comprising:

• a polarizer configured to convert an input beam into a linearly polarized beam;
• a collimator configured to receive the linearly polarized beam from the polarizer and expand the linearly polarized beam;
• a single polarization-sensitive lens configured to simultaneously generate, from the expanded linearly polarized beam, a first spherical wave of right-handed circular polarization having a negative focal length located on a source side of the single polarization-sensitive lens, and a second spherical wave of left-handed circular polarization having a positive focal length located on an object side of the single polarization-sensitive lens;
• wherein the negative focal length and the positive focal length are formed along a single optical path;
• a scanning unit configured to scan an object by using an interference beam formed by superposition of the first spherical wave and the second spherical wave along the single optical path;
• a light integrator configured to spatially integrate light reflected from the object scanned by the interference beam;
• a first beam splitter configured to receive the spatially integrated light from the light integrator and to split the spatially integrated light into a first output beam and a second output beam;
• a second beam splitter configured to split the first output beam into a 1ath output beam and a 1bth output beam;
• a third beam splitter configured to split the second output beam into a 2ath output beam and a 2bth output beam;
• first, second, third, and fourth polarizers respectively arranged to polarize the 1ath, 1bth, 2ath, and 2bth output beams, wherein polarization directions of the first to fourth polarizers are rotated 0°, 45°, 90°, and 135°, respectively, relative to one another;
• and
• first, second, third, and fourth photodetectors configured to respectively detect the 1ath, 1bth, 2ath, and 2bth output beams passing through the first to fourth polarizers and generate corresponding detection signals,
• wherein an electronic processor is configured to combine the detection signals to obtain a complex hologram of the object based on geometric-phase interference of the first spherical wave and the second spherical wave.