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If you're carrying money, a drivers license, or credit cards, you're carrying around holograms. The dove hologram on a Visa card may be the most familiar. The rainbow-colored bird changes colors and appears to move as you tilt the card. Unlike a bird in a traditional photograph, a holographic bird is a three-dimensional image. Holograms are formed by interference of light beams from a laser.
How Lasers Make Holograms
Holograms are made using lasers because laser light is 'coherent.' What this means is that all of the photons of laser light have exactly the same frequency and phase difference. Splitting a laser beam produces two beams that are the same color as each other (monochromatic). In contrast, regular white light consists of many different frequencies of light. When white light is diffracted, the frequencies split to form a rainbow of colors.
In conventional photography, the light reflected off an object strikes a strip of film that contains a chemical (i.e., silver bromide) that reacts to light. This produces a two-dimensional representation of the subject. A hologram forms a three-dimensional image because light interference patterns are recorded, not just reflected light. To make this happen, a laser beam is split into two beams that pass through lenses to expand them. One beam (the reference beam) is directed onto high-contrast film. The other beam is aimed at the object (the object beam). Light from the object beam gets scattered by the hologram's subject. Some of this scattered light goes toward the photographic film. The scattered light from the object beam is out of phase with the reference beam, so when the two beams interact they form an interference pattern.
The interference pattern recorded by the film encodes a three-dimensional pattern because the distance from any point on the object affects the phase of the scattered light. However, there is a limit to how 'three-dimensional' a hologram can appear. This is because the object beam only hits its target from a single direction. In other words, the hologram only displays the perspective from the object beam's point of view. So, while a hologram changes depending on the viewing angle, you can't see behind the object.
Viewing a Hologram
A hologram image is an interference pattern that looks like random noise unless viewed under the right lighting. The magic happens when a holographic plate is illuminated with the same laser beam light that was used to record it. If a different laser frequency or another type of light is used, the reconstructed image won't exactly match the original. Yet, the most common holograms are visible in white light. These are reflection-type volume holograms and rainbow holograms. Holograms that can be viewed in ordinary light require special processing. In the case of a rainbow hologram, a standard transmission hologram is copied using a horizontal slit. This preserves parallax in one direction (so the perspective can move), but produces a color shift in the other direction.
Uses of Holograms
The 1971 Nobel Prize in Physics was awarded to the Hungarian-British scientist Dennis Gabor 'for his invention and development of the holographic method'. Originally, holography was a technique used to improve electron microscopes. Optical holography didn't take off until the invention of the laser in 1960. Although holograms were immediately popular for art, practical applications of optical holography lagged until the 1980s. Today, holograms are used for data storage, optical communications, interferometry in engineering and microscopy, security, and holographic scanning.
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Interesting Hologram Facts
- If you cut a hologram in half, each piece still contains an image of the entire object. In contrast, if you cut a photograph in half, half of the information is lost.
- One way to copy a hologram is to illuminate it with a laser beam and place a new photographic plate such that it receives light from the hologram and from the original beam. Essentially, the hologram acts like the original object.
- Another way to copy a hologram is to emboss it using the original image. This works much the same way records are made from audio recordings. The embossing process is used for mass production.
Updated on: February 04, 2019
There are multiple processes for creating holograms for IDs (identification cards). In this instance, we will focus on the holograms used for official cards. The government uses sophisticated methods for creating ID holograms to prevent counterfeiting and prove authenticity, but you can create a novelty ID hologram at home.
Florida Drivers License Hologram
Place a driver's licence on the scanner and scan as you would any other document. Using a laser printer, print the holographic image onto a transparency sheet.
Tape the transparency to a hologram stencil maker, such as Photo-EZ (see Resources). Place the transparency/Photo-EZ sheet combination in direct sunlight for four minutes (preferably outdoors) to develop the Photo-EZ film. Wash the Photo-EZ film by soaking it in clean water for 10 to 11 minutes and gently shaking the film. All the parts covered by the negative will wash away, leaving the stencil. Let dry.
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California Drivers License Hologram
Take a transparent base made for paints and mix it with a dual-tone paint, such as Perl-Ex (see Resources). Using Perl-Ex, mix the substances in a 1:50 ration -- 1 part paint and 50 parts base. If using a different brand, use that brand's base-to-paint ratio suggestion.
Place the hologram stencil directly on a polyvinyl chloride (PVC) ID card or, if using laminated paper for the ID, you can apply the hologram on the paper prior to lamination or on the finished laminated card. Put the hologram in reverse if placing the hologram on the paper prior to lamination. With a screen-printing brush, carefully apply a thin layer of the dual-tone paint to the stencil.
How To Make Driver License Holograms
Once the paint is dry, laminate the ID if it is on laser paper. If you painted it on after lamination or on a PVC card, merely wait for the paint to dry, and you've got a new novelty ID card with a hologram.
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How To Make Hologram Video
- When selecting a dual-tone paint, pick the one that closely matches the two dominant colours on the driver's licence.