Abstract
We report observations of acoustic wave reflections by an optically produced holographic grating within iron-doped LiNbO3. The stored hologram, through the electroacoustic effect, causes a spatially varying acoustic velocity change which can serve to reflect acoustic waves. We have demonstrated the reflection of bulk acoustic waves from a 4-μm period grating in LiNbO3 with an iron doping of 0.015%. The acoustic frequency was 0.9 GHz. A strong interaction with a reflection coefficient of 4×10−4 per grating element was found. Memory retention exceeds the three months over which we have observed the effect. The reflections can be exploited to produce practical filters and resonators.
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