HolographyOf the many ways to produce a hologram, the Direct Beam Reflection Hologram is the most straightforward and was our first method for producing holograms. For transmission holograms with a helium-neon laser, the Direct Beam Transmission Hologram or the One Mirror Transmission Hologram can be produced with fairly simple geometries.
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Equipment: Holography
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Direct Beam Reflection HologramGeneral considerations: The beamspread should be made slightly larger than the film. The gaussian distribution of the light puts most of the light in the central two-thirds of the beam. The object should be placed close to the film. The closer to the film, the brighter they will appear in the finished hologram. The beam intensity should be about the same from the two sides of the film, so best results are obtained with reflective objects.
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Sample Procedure, Direct Beam
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Holography Setup, Direct Beam Reflection
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Direct Beam Transmission HologramGeneral considerations: This kind of hologram has greater depth of field than the reflection hologram so that objects may extend further from the film. A disadvantage is that most of the scene is backlighted and will be in shadow. A laser is required to view the transmission hologram. The emulsion side of the film should face the object. Make sure no shadow of the object falls on the film. Basic setup of equipment |
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One Mirror Transmission HologramGeneral Considerations: This process allows front illumination of the object, an advantage over the direct beam method. The light from the mirror should be 3 to 4 times brighter than the light from the object at the film. |
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Holography References
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