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Effect of a random pattern through a multimode-fiber bundle on angular and spatial selectivity in volume holograms:
1Seoul National University, National Research Laboratory of Holography Technologies, School of Electrical Engineering, Kwanak-Gu Shinlim-Dong, Korea.
Applied Optics
|July 27, 2002
Summary
We explored random-pattern (RP) referencing in photorefractive volume holograms. RP referencing enhances spatial selectivity but not angular selectivity, which depends mainly on hologram dimension.
Area of Science:
- Holography
- Optical Engineering
- Materials Science
Background:
- Photorefractive volume holograms are crucial for optical data storage.
- Reference beam characteristics significantly influence hologram selectivity.
- Understanding spatial and angular selectivity is key for optimizing hologram performance.
Purpose of the Study:
- To investigate the angular and spatial selectivity of a multimode-fiber bundle reference scheme in photorefractive volume holograms.
- To experimentally and theoretically analyze the impact of random-pattern (RP) referencing on hologram selectivity.
- To compare RP referencing with Gaussian referencing and assess its suitability for hologram memory systems.
Main Methods:
- Demonstration of a multimode-fiber bundle reference scheme.
- Experimental measurement of angular and spatial selectivity by varying distances between the photorefractive crystal and fiber bundle.
- Theoretical analysis of selectivity dependence on hologram dimension and referencing methods.
- Comparison of random-pattern (RP) referencing with Gaussian referencing.
Main Results:
- Random-pattern (RP) referencing significantly enhances spatial selectivity but shows minimal improvement in angular selectivity.
- Angular selectivity is primarily determined by the volume hologram's dimension, irrespective of RP referencing.
- Spatial selectivity using RP referencing is largely independent of hologram dimension and depends on the transversal speckle size of the RP beam.
- RP beams can introduce high-frequency noise in angular-multiplexing regimes, potentially hindering hologram memory applications.
Conclusions:
- RP referencing offers a method to improve spatial selectivity in photorefractive volume holograms.
- Angular selectivity remains a function of hologram dimensions, even with RP referencing.
- The findings provide insights into optimizing reference beam strategies for hologram memory systems, highlighting potential trade-offs between spatial selectivity and noise introduction.
