Speckle effect in scanning display systems that employs polarized phase-coherent light is reduced by depolarizing the phase-coherent light using a depolarizer and scanning the depolarized light for producing desired images. The average silver halide grain size is from about 0. The ferule is collapsed to attach the optical fiber to the athermal package. A central processing unit 60 controls respective operations of the dry gas nozzles 37 and a driving unit 52 for the shutter 36. To make a memory device, an electrical pulse is applied through the memory cell to form a conduction path through the dielectric element.