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Introduction

Vibrations

Processing

SB Transmission

Exposure

Recording

SB Reflection

MB Transmission

MB Reflection

Lighting

Resources

Creating A Multi-Beam White Light Reflection Hologram

You are now going to use the real image of your final multi-beam transmission hologram plate as the object scene in this multi-beam white light reflection display hologram setup. You're also going to use your multi-beam transmission setup for this reflection hologram setup, with a few changes. Figure 86 illustrates the setup if you want to hang your hologram on a wall and use overhead ceiling lighting. Later, in Figure 89, I'll show you the setup if you want to hang your hologram on a wall and use underneath table based lighting. Figure 87 shows a close-up of H1, H2, and the projected real image positions.

multi-beam reflection setup image
Figure 86: Multi-beam white light reflection display hologram setup for overhead reconstruction.

close-up of H1 & H2 image
                                Figure 87: Close-up of H1, H2, and real image.

There are a number of things that have changed in this setup from the multi-beam transmission setup, which we'll set up in a moment:

Note: It is important in this reflection hologram setup that you do not move any of the components in the new object beam path including the laser, mirror M1, and beamsplitter BS which are outside the object beam path. This will insure that the new object beam incident on transmission hologram H1 is exactly the same as it was when you made it, and this in turn, will guarantee that its projected real image is distortion free.

New Object Beam Changes

The first change is to remove the object scene OS from the optical table. The loss of weight on the optical table by removing the object scene OS and its mount may cause the reconstructing object beam O to slightly shift its position at H1. We'll tweak this later.

The second change is to insert H1 in its plate holder and orientate the transmission hologram H1 so it is projecting it's real (pseudoscopic) image. You're now ready to make changes to the new reference beam.

Setting Up the Components in the New Reference Beam

This section should be read through completely before implementing because you'll probably have to build and paint some more components if you haven't already. Viewing Figure 86:

Check the reference beam illumination again at H2 for uniform illumination and adjust DL2 if needed. Check that H1 is uniformly illuminated and adjust DL1 if needed. Put your shutter in place. Go ahead with the recording procedure and processing. Check the density of your first recording before bleaching and make exposure time corrections if needed. Make sure that when you put the plate in the H2 holder, the emulsion is facing H1. This means that when the hologram is illuminated as it hangs on a wall from overhead, the emulsion will face the viewer. This also allows the glass side of the bleached plate to be painted flat black for a much brighter image. Use the painting procedure described previously.

If you want your final white light reflection display hologram to be illuminated from underneath the plate with the illuminating light source on a table top, use the setup shown in Figure 89.

multi-beam reflection setup image
                                Figure 89: Multi-beam white light reflection display hologram
                                                    setup for underneath reconstruction.

A reflection hologram produces a monochromatic colored image. Since this hologram will be viewed with a white light source described in the next sub-section, the color reconstructed in the image will depend on two factors: