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Holographic recording with limited laser light.

C D Leonard, A L Smirl

|January 23, 2010

Summary

This study compared holographic recording media performance at low signal energy densities. Kodak 649 F and Agfa films showed optimal diffraction efficiency and contrast ratio after adjustments to processing and beam exposure.

Area of Science:

Holography
Photographic science
Materials science

Background:

Holographic data storage requires high diffraction efficiency and contrast ratio.
Optimizing recording media is crucial for low signal energy density applications.

Purpose of the Study:

To compare the performance of various holographic recording media under low signal energy densities.
To determine optimal processing and exposure parameters for selected films.

Main Methods:

Determined peak diffraction efficiency (Q) and normalized contrast ratio (A) divided by signal-beam exposure.
Evaluated Kodak 649 F and Agfa 8E70, 10E70, and 14C70 films.
Optimized parameters including bleaching, hypersensitization, development, and reference beam exposure.

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Main Results:

Quantities Q and A were found to be constant above a specific reference-to-signal beam ratio.
The film response was modeled using T(a) = [b/(b + E(d))] (e) to calculate Q and A.

Conclusions:

Specific holographic recording media can achieve optimal performance at low signal energy densities.
Processing and beam exposure parameters significantly influence holographic recording media efficiency.