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Making A Hologram

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					Making A Hologram
         What is a hologram?
• A hologram is a 3-D image constructed from the
  interference of two coherent light beams; a
  reference beam, and an object beam.
• The object beam possesses the intensity and
  spatial information regarding the object as a
  result of reflecting off the object.
• The reference beam comes directly from the
  source and interferes with the object beam.
• As these two beams meet at the holographic
  film, an interference pattern (hologram) results.
         Choosing an Object
• The following criteria should be considered
  when choosing your object…
  – It should be made of a solid material such as
    keys, or pocket change. No furry objects or
    fabrics.
  – It must appear bright when illuminated with
    red laser light. No dark colored objects.
  – It must not move or deform.
  – Shiny, bright ceramic figurines work great!
    An Overview of the Process
• We will be constructing a “white light reflection
  hologram”.
• Utilizing the “contact copy” method, the holographic
  plate (holoplate) is leaned directly against the object
  during the exposure process.
• After exposure, the holoplate is developed in a “dark
  room” (green light only).
• The holoplate is EXTREMELY sensitive to vibration
  during the exposure process. Therefore NO
  TALKING is permitted during the process (the
  hologram results from interference of light waves).
• You will be asked to REMAIN STILL ( NO
  WALKING). You will, however be allowed to
  breathe…
                    The Details
• Place a latex glove on the hand with which you will be
  holding the holographic plate (holograf). The object will
  be held with your other hand. Wait on the right side of
  the room (facing my desk) until called upon to start the
  process.
• The vertical notebook at my desk acts as the shutter.
  Make sure that the notebook prevents light from shining
  on the sandbox.
• Place your object in the middle of the sandbox.
• I will place the holograf on your object at the proper
  angle.
                   The Details
• Wait 10 seconds, then lift the notebook off the table…the
  notebook should still be blocking the laser light.
• Wait 5 more seconds.
• Bring the notebook towards you, exposing the holograf
  and object to the laser light. Expose the holograf for 20
  seconds.
• Block the light with the notebook, then set it GENTLY
  onto the desktop.
• Pick up your holograf carefully, grasping the EDGES
  with your gloved hand, your object with the other.
• Go to the table nearest you to rinse your holograf.
  GENTLY swish your holograf. It MUST NOT touch the
  bottom of the dish. Do this for 10 seconds, then place a
  paper plate under your holograf (to prevent drips) as you
  move to the next tray on your left.
• Swish in the Developer for 30 seconds (grasp EDGES).
                The Details
• Now advance to the nest table to rinse again for
  30 seconds (use that paper plate to avoid drips,
  again).
• Swish in bleach until it turns clear in about 60
  seconds.
• Rinse again for 30 seconds.
• Swish in Wetting Solution for 30 seconds.
• Lastly, rest the hologram nearly vertically in the
  paper bowl. Your name should already be on the
  bowl.
• Let it dry until tomorrow.
      Viewing Your Hologram
• The hologram may be illuminated with white light
  (other than fluorescent lights). Spot lights are
  best. They should be oriented at the same
  position the original source was at. The
  hologram may be viewed with the light source
  reflecting off the hologram, so this is a
  REFLECTION hologram.
• If monochromatic and coherent light is shone
  THROUGH the plate in order to view the
  hologram, the hologram is a TRANSMISSION
  hologram.

				
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posted:6/23/2012
language:English
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