VIDEO-RATE ELECTRON-HOLOGRAPHIC INTERFERENCE MICROSCOPY AND ITS APPLICATION TO DYNAMIC OBSERVATION OF ELECTROMAGNETIC-FIELDS

The system described here provides video-rate observation by using a l iquid-crystal spatial light modulator as a rewritable electron-hologra m medium. Time-sequential interference micrographs are produced by sup erimposing a plane reference wave on the object wave reconstructed fro m the hologram displayed on the modulator. Experimental observations o f the magnetic field of a barium ferrite particle and of dynamic domai n-wall motion in a thin ferromagnetic film are shown. The sources of e rror in system are discussed, and a distortion-free system is proposed .