Rapid time-gated polarimetric Stokes imaging using photoelastic modulators

摘要: We report a rapid time-gated full Stokes imaging approach without mechanically moving parts, which is well-suited for biomedical applications, using two photoelastic modulators (PEMs). A charge-coupled device (CCD) with microsecond time-gating capability was used to acquire the images. To synchronize CCD PEMs, thus gaining signal-to-noise ratio advantage, field programmable gate array employed. After calibration, an evolutionary algorithm select four time points from vector can be recovered. Using images taken by camera at these times (in ∼80  ms), of vectors different incident polarization states were accurately derived.