Holograms Roger Rothenberg. Record of light scattered from an object Same light field is ‘reconstructed’ without original object present Requires laser.

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Presentation transcript:

Holograms Roger Rothenberg

Record of light scattered from an object Same light field is ‘reconstructed’ without original object present Requires laser for tight control of light source and light field Appears 3-dimensional

‘Object’ beam – Beam is spread and illuminates scene to be recorded ‘Reference’ beam – Beam is directed to recording medium w/o scattering off of object Beams create interference pattern on recording medium When light similar to reference is shined on developed medium, it diffracts to produce a light field identical to light field of object beam

Holograms

Transmission Hologram Reference beam and object beam on same side of holographic surface Viewed by shining laser light through image side Must be viewed by same wavelength light used to create

Transmission Hologram

Reflection Hologram Reference beam and object beam come from opposite sides, shine on opposite surfaces Visible without laser light Require only white light to view

Reflection Hologram

Hologram Applications Data Storage Image Processing Interferometric Microscopy Security – E.g. Credit Cards, ID, Passports