Holography Irradiance A photograph records the irradiance of

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Holography

Holography

Irradiance ] A photograph records the irradiance of an image. • Energy per unit

Irradiance ] A photograph records the irradiance of an image. • Energy per unit area ] Light areas represent high irradiance points in the object. Photo by Jason Bruges Studio

Amplitude Record ] Image display returns the irradiance at each point. • Indirectly amplitude

Amplitude Record ] Image display returns the irradiance at each point. • Indirectly amplitude • Color photographs sort waves by frequency

Phase Information ] Waves can be described by amplitude and phase. • Amplitude alones

Phase Information ] Waves can be described by amplitude and phase. • Amplitude alones lacks information ] If phase information is included then there is everything the eye sees of the object. • Three-dimensional image • Proposed in 1948, Nobel Prize in 1971.

Reference Wave ] To preserve phase information a reference wave is needed. ] A

Reference Wave ] To preserve phase information a reference wave is needed. ] A coherent monochromatic wave maintains the same amplitude and phase on reflection.

Object Wave object wave ] A reflected wave from an object interferes with the

Object Wave object wave ] A reflected wave from an object interferes with the reference wave. • Same initial source ] This interference reference wave pattern has information about phase, too.

Transmission Hologram ] The angles of the diffraction rings are used to determine the

Transmission Hologram ] The angles of the diffraction rings are used to determine the crystal spacing. holographic image

Hologram Viewing ] Shining the same coherent light through the recorded pattern recreates a

Hologram Viewing ] Shining the same coherent light through the recorded pattern recreates a virtual image. Wikipedia Commons

Rainbow Hologram ] An object illuminated through a narrow horizontal slit will provide partial

Rainbow Hologram ] An object illuminated through a narrow horizontal slit will provide partial information. • Narrow horizontal slice ] Different slices respond to different frequencies. • Based on angle • White light illumination

IRRADIANCE WHAT IS IRRADIANCE Irradiance is the unitIRRADIANCE WHAT IS IRRADIANCE Irradiance is the unit
Holography 1 History of Holography Invented in 1948Holography 1 History of Holography Invented in 1948
Topics covered What is holography History of holographyTopics covered What is holography History of holography
Holography Introduction l Whats holography From escalator ofHolography Introduction l Whats holography From escalator of
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Iceland Photograph by Luka Esenko Puffin Photograph byIceland Photograph by Luka Esenko Puffin Photograph by
Iceland Photograph by Luka Esenko Puffin Photograph byIceland Photograph by Luka Esenko Puffin Photograph by