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Holographic optical element for visual display applications.

D G McCauley, C E Simpson, W J Murbach

|February 4, 2010

Summary

This summary is machine-generated.

Holographic visual displays using dichromated gelatin show consistent image quality despite gelatin swelling. Thickness changes are key to optimizing diffraction efficiency and display wavelength without altering image angles.

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Area of Science:

Optics
Materials Science
Holography

Background:

Reflection-type holographic visual display elements are crucial for advanced imaging.
Dichromated gelatin is a common recording medium, but its processing can alter physical properties.

Purpose of the Study:

To investigate the performance of off-axis holographic visual display elements recorded on dichromated gelatin.
To analyze the impact of gelatin swelling and thickness changes on holographic image characteristics and diffraction efficiency.

Main Methods:

Recording holographic elements on dichromated gelatin coated on planar and spherical substrates.
Utilizing argon laser for recording and mercury arc lamp for reconstruction.
Comparing measured image characteristics with ray-tracing calculations.
Analyzing the effect of gelatin thickness variations on Bragg diffraction.

Main Results:

Image characteristics of flat substrate holograms align with ray-tracing predictions.
Gelatin swelling (approx. 6.6%) did not perceptibly affect image dispersion, astigmatism, or distortion.
Gelatin thickness changes, however, influenced Bragg diffraction efficiency and allowed for wavelength adjustment.
A linear relationship was observed between dichromate concentration (0.5-10%) and peak diffraction efficiency wavelength.
Lateral dispersion was consistent (0.12 +/- 0.01 deg/nm) for both substrate types, but astigmatism differed.

Conclusions:

Dichromated gelatin holographic displays offer stable image quality concerning swelling.
Gelatin thickness modulation is a viable method for tuning diffraction efficiency and display wavelength.
The findings provide insights for optimizing holographic display performance and wavelength control.