Cherry Optical Holography
What is Holography?
By Nancy Gorglione
A Hologram is a three-dimensional photograph recorded through the positive interference of waves of laser light. Clear film windows of space, holograms can contain projected images, floating out in front of the hologram. Receding background images mark depth in space, while parallax - the ability to see around objects to objects placed behind, reinforces the true three dimensional effect for the viewer. Moving Holograms portray moments in time. And, Holograms can be breathtakingly beautiful.
Holography as Art Form is a profound media which allows the artist to record a three dimensional image that can contain aspects of both time and space, on a single, flat film plane. Moving, kinetic colorations; additive color mixture; time smear; space within space, and parallax plays; depth and projection; overlapping of imagery; all can produce stunning effects unique to the media.
A Hologram is a diffraction record of the positive interference of two wave fronts of laser light. Originally recorded on a photosensitive emulsion, the hologram is composed of a series of very fine lines which diffract or bend the reconstruction light back on the path of the original object. A hologram is a diffraction record of the in-phase light waves that reached the holographic film during its exposure.
Holography Graphics developed for Forsyth Gallery at Texas A & M University by N. Gorglione. Copyright 2017
The Object Light is the light that illuminates the object, then bounces off the object and strikes the film. The Reference Beam is a clean spread of collimated laser light covering the film. Where the Object Beam and the Reference Beam meet on the film, they record the image in all its true three-dimensional glory. We Reconstruct the original holographic image by shining a light through the holographic film at the same angle as the original Reference Beam. This angle is called the reconstruction angle. Read more about it on our Transmission Hologram Art Page and Reflection Hologram Art Page.
All waves obey all ways
The positive interference of the Object and Reference Beams record the holographic image. An analog is ocean waves, which can be observed reinforcing each other to grow larger, or splashing into each other to diminish in size. Where the peaks or troughs of our laser’s waves meet in the holographic film, the parts that reinforce each other -called Positive Interference, are bright enough and energized enough to start an energy transition in the holographic film. Since a laser used for holography is coherent in time and space, it emits a continuous stream of light waves whose peaks and troughs travel on the same paths together, in-phase.
Holography continuous wave lasers emit a clean single mode or stream of in-phase photons, coherent in time and space. Pulsed lasers emit very bright brief coherent flashes to record animate objects, portraiture; while multiple pulses can produce interferograms.
The most common holographic film contains very fine resolution grains of silver halide evenly distributed throughout a binding and adhering gelatin. The basic exposure formula is
“absorption of the photon supplies energy to free an electron which can move through the crystal lattice” (of the silver halide gelatin film.) At one of the evenly distributed crystal imperfections, the freed electron is trapped. This further attracts interstitial ions (charged particles) of silver which continue to build up throughout the exposure. “A latent image spec of of at least 3 or 4 silver atoms is necessary for catalyzing development.”
Quotes and paraphrasing of: Silver Halide Photographic Materials, by K. Biedermann, in Holographic Recording Materials in Topics in Applied Physics, Vol. 20. Edited by H.M. Smith Spinger-Verlag, Berlin Heidelberg, New York.
After exposure, the film is developed, stopped, and then bleached, which re-halogenates the silver and turns it into a salt which kind of acts like a series of miniature lenses. The Reconstruction Light bends around or through these holographic lenses, called Zone Plates, to reconstruct the original object. A series of Zone Plates creates the Diffraction Matrix of our Hologram. If both Object and Reference beams are more fully collimated, ( minimal or no spread as the beams travel through space) the Diffraction Matrix can resemble microscopic lateral lines rather than overlapping circles. The middle of the page on Reflection Hologram Art illustrates zone plates and interference.
AH Zone Plate Graphic by Nancy Gorglione.
AH at the center of a Tigle, or spheres of light in space, in one of the Dzogchen Clear Light Views. Looking like the Zone Plate of a holographic matrix, or electrons orbiting an atom's nucleus, The Holographic View lends itself to diverse interpretations of our Holographic Universe. The Buddhist Clear Light-Dzogchen View holds and molds phenomena as diffracted light held together on a matrix of sound.
The Incarnations of the Pegasus Holograms
Please See Scroll Box on Right of Cherry Optical Holography Page.
Holographic Books, Catalogs and Posters
Archetypes in Holography: If You Can See It, Its Not There
Self Contained Holograms - Internally illuminated Holograms framed in a box.
THE HOLOGRAPHIC ARTS
Cherry Optical Holography
HOLOGRAMS! Welcome to Universal-Hologram, web home for holographic artists, Nancy Gorglione and Greg Cherry. As Cherry Optical Holography, we've made hundreds of unique and beautiful reflection and transmission holograms.
LASER LIGHTING! As Laser Affiliates - begun in 1974, and merged with Cherry Optical Holography in 2002 - we've created many holographic laser effects: slaser performances, laser environments, laser light shows, and laser devices.
Cherry Optical Holography Optical Set-Up shown with 18 inch overhead collimator
GREG CHERRY"S SCRATCHOGRAMS
Nancy Gorglione has compiled pictures of most of our hundreds of holograms, laser performances and history in holography in the upcoming book, Archetypes in Holography: IF YOU CAN SEE IT, ITS NOT THERE Nancy Gorglione's publications, from The Archives of Holography; to non linear bring information into the holographic realm. We're also your web hosts, where we hope to take you on a brief visual journey through some of the highlights of our lifetimes exploring holography, true three-dimensional laser photography.
Archetypes in Holography: IF YOU CAN SEE IT, ITS NOT THERE
Equus/Underwater, A Holographic StageSet with Laser Lighting by Nancy Gorglione & Greg Cherry, as Laser Affiliates and Cherry Optical Holography. Forty custom holograms created a landscape of a horse galloping by the side of a river. Timed lighting varied the holographic colors and imagery in this installation.
TRANSMISSION HOLOGRAMS by Nancy Gorglione & Greg Cherry
A few examples of our many transmission holograms.
Left, Light Thru the Trees, Shadowgram and Rainbow Hologram combined to create an effect of moving leaves and colors. By Nancy Gorglione, 22 by 30 Inches, originated for Equus Underwater, above.
Below, Math Poem, Multichannel Rainbow Hologram by Nancy Gorglione, 12 by 16 inches. Originated for Lawrence Hall of Science Exhibition, Laser: The Light Fantastic.
These holograms are three dimensional images recorded with laser light onto film or glass plates. We've created dazzling windows of light, from one-of-a-kind holographic art and sculpture; to intricate space-within-space magic. As early artist-engineers in a brand new media, our work has consistently originated archetypes in the Holographic World.
We were there to spur on the evolution of the laser as artist's tool. Laser light's mesmerizing ability to sync with sound spurred the development of performance structures with laser light a star of the show.
Nancy Gorglione and Greg Cherry developed laser scanning as an art form, often in collaborative performance with musicians and dancers. The long-running Light Sound Motion Performance Series and the contemporary Laser Light & Percussion Orchestra synchronize light and sound with community artists and percussion orchestras.
Greg Cherry's Telescope Hologram
Look inside the projected telescope eyepiece to view a
by Nancy Gorglione
& Greg Cherry
Greg Cherry is introducing his new holographic display system, with self-contained lighting, Holographic Space-in-a-Box is now available in a few of Nancy Gorglione and Greg Cherry's more popular holographic images.
We've consistently made some of the best holograms in the world, a few of which are now available for sale within an internally-lit, wood frame box for tabletop viewing.
One-of-a-Kind Reflection Hologram Composites by Nancy Gorglione
Large Format Holographic Sculpture from Nancy Gorglione & Cherry Optical Holography
Home of Cherry Optical Holography
Finest holograms by Nancy Gorglione & Greg Cherry
Index and Home Page
Cherry Optical Holography
All Contents Copyright © 2017