18 Jun

How to make a Hologram

LASER TRANSMISSION HOLOGRAM 

How to make a hologram – Postcards produced for Hologram Museum/Gallery Tourist exhibition, Drottninggatan 100, Stockholm

Copyright Hologram Gallery

      How to make a Laser-Transmission Hologram

The tiny beam from a laser is “cleaned” and diverged when it passes through a spatialfilter.

The object is illuminated by laser light, objectlight, and some of this light is reflected against the hologram plate. The plate is also illuminated by light which is directed from the laser with a mirror, referencelight.

The hologram is built up by a pattern of fringes, an interference pattern. This pattern is created when the object and the reference light meets, interferes, in the holographic plate.

This type of hologram can not be seen in ordinary light from a spotlight only by using laserlight.

REFLECTION HOLOGRAMType Denisyuk 

 How to make a Reflection Hologram
The tiny beam from a laser is “cleaned” and diverged when passes through a spatialfilter. 

The object is illuminated by laser light directly through the hologram plate. The hologram is built up by a pattern of fringes, an interference pattern, which is created when laser light from the object and direct light from the laser, interferes, in the holographic plate.

This hologram can be seen by using ordinary spotlight.

THE DIFFERENCE BETWEEN PHOTOGRAPHY AND HOLOGRAPHY

The difference between Photography & Holography Copy Professor Nils Abramson 

The Photography register what the camera’s lens registers (A). How the object looks from any other points outside the camera lens is not registered (B). The hologram however, register the object from each point at the object (C, D)) without the help of a lens or a camera.

It’s as if thousands of eyes on the hologram surface each can see the object.

 

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