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Figure 19: Experimental setup of polarization holographic image storage. PBS, polarization beam splitter; , mirrors; , lens; and , continuously adjustable attenuators; and : diaphragm; , polarizer; , quarter-wave plates; and , shutters; LD, 405 nm laser diode; He-Ne: 633 nm Helium-Neon laser; O-beam, object beam; R-beam, reference beam; C-beam, reconstruction beam; D-beam, diffracted beam; E-beam, erasure violet light.