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21:43 River Valley TV English 2012

Early work and influence

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
20:43 River Valley TV English 2012

The history of holography: Multiple visions

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
23:22 River Valley TV English 2012

"Pseudo crystal beginning"

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
14:50 River Valley TV English 2012

Ultra-fine-grain emulsions and the SilverCross project

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
10:11 River Valley TV English 2012

Yuri Denisyuk: An appreciation

Emmett Leith is recognized today as one of a handful of key innovators in the subject that became holography. He can be remembered for distinct accomplishments and attributes. During the 1950s, Leith played a crucial role in synthesizing a new subject from previously quite separate ones. During the early 1960s he dramatically extended the possibilities of wavefront reconstruction and, with equal modesty, publicized them. His ideas and competence inspired a generation of colleagues at Willow Run Laboratories, many of whom went on to contribute to the modern subject, art and business of holography, and he displayed an uncommon coherence in his own intellectual interests, although his own career mutated from classified work, to popularization, and to an academic role.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
09:08 River Valley TV English 2012

Yuri Denisyuk

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
16:54 River Valley TV English 2012

Daguerreotype holography

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
21:34 River Valley TV English 2012

Colourholographic Ltd BBPan panchromatic emulsions for recording colour holograms

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
18:08 River Valley TV English 2012

Emmett Leith and Yuri Denisyuk memorial

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
11:22 River Valley TV English 2012

New on the map.

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
19:11 River Valley TV English 2012

Eosin Y/triethanolamine dispersed poly (hydroxyethyl methacrylate-co-methyl methacrylate) photopolymer

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
05:41 River Valley TV English 2012

Conference opening speech

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
17:57 River Valley TV English 2012

Holography, Art, and Science

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
18:59 River Valley TV English 2012

Intrinsic properties of holographic recording materials: principles and devices used for an objective evaluation

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
32:00 River Valley TV English 2012

International Symposium on Display Holography and it's beginnings, Lake Forest College, USA

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
22:43 River Valley TV English 2012

FUJIFILM

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
14:44 River Valley TV English 2012

Teaching holography: New problems, new courses and new students

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
07:58 River Valley TV English 2012

Organic and inorganic recording medium for registering optical (classical 2D/3D) and digital (Computer-Synthesized) 3D holograms

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
16:37 River Valley TV English 2012

Multi-layer systems with DESA emulsions

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
21:16 River Valley TV English 2012

Improving the remarkable photosensitivity of dichromated gelatin for hologram recording in green laser light

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
37:51 River Valley TV English 2012

HoloPov:

In display holography, when the reconstruction wavelength or geometry differ from those of recording, the image is, in general, distorted and aberrated. These variations from the original object are hard to predict using the usual optical equations, which are best suited to imaging systems where the pupil of the system is known a priori. Here I describe the latest features of a computer program (HoloPov) developed to predict and to graphically display the distortions and aberrations in display holograms. The program has an easy to use graphical user interface, and can produce animations.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
48:31 River Valley TV English 2012

Large format digital colour holograms

RGB pulsed laser technology provides a natural way to circumvent the problems of vibration inherent in conventional CW holographic printer schemes. Using such technology we have been able to print 1-step dot-matrix digital holograms at speeds of up to 50 RGB colour pixels per second in relatively compact printer configurations. Typical hologram pixel sizes that have been employed are around 1 mm diameter. Both full parallax and single parallax digital reflection holograms have been generated in this way with sizes of up to 1 m × 1.5 m. RGB transmission rainbow holograms have also been generated using this approach. Quicker generation of digital holograms is possible using a variety of 2-step pulsed laser printer schemes, the simplest of which consists of the contact or close copying of an original master dot-matrix hologram that has been specially processed. Other 2-step techniques such as H1:H2 schemes have required more powerful RGB pulsed lasers and yet have shown that they are capable of producing one–off smaller format holograms at high speed.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
13:15 River Valley TV English 2012

Optical reconstruction of digital hologram using cascaded liquid crystal spatial light modulators

We propose and demonstrate a three-dimensional object reconstruction technique that uses complete amplitude and phase information of a phase-shifting digital hologram by cascading liquid crystal spatial light modulators with a nearly full range complex modulation. The cascaded liquid crystal module is performed by operating both in amplitude-mostly and phase-mostly modulation modes. The amplitude-mostly modulation is applied by minimizing the phase variation, whereas the phase-mostly mode is achieved by minimizing the amplitude variation during the voltage-driven period. The transfer characteristic of the cascaded liquid crystal module is analyzed by the Jones matrix method to yield the suitable polarization states for realizing full-range complex modulation. It is well known that a digital hologram can store both amplitude phase information of an optical electric field and can reconstruct the original three-dimensional object by numerical calculation. This work demonstrates that it is possible to reconstruct optically three-dimensional objects using complete amplitude and phase information of the optical field calculated from the phase-shifted digital holograms. The use of both amplitude and phase information enable us to reconstruct optically three-dimensional objects with fair image quality by selecting the orientation of polarization and the modulation conditions of the cascaded liquid crystal module. Both analytical and experimental results are presented and discussed.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
19:53 River Valley TV English 2012

Nickel electroforming

Nickel electroforming is a manufacturing technique that is closely related to nickel electroplating, employing very similar technology. Both of these processes were invented and developed, in parallel, during the 1840s; so nickel electroforming is by no means new. Despite the fact that it has existed for over 160 years and has a host of wide ranging commercial applications, it remains a process that is not well recognised, even by experienced scientists, technologists or engineers. The applications of nickel electroplating, on the other hand, are much more familiar, since nickel electrodeposits are an essential part of what is generally known as ‘chrome’ or ‘chromium’ plating. Both of these terms are unfortunate misnomers since the coating system that is known by either name actually consists of about 99% nickel. The chromium is present only as a very thin top-coat which accounts for a mere 1% of the thickness of the total deposit system.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
44:40 River Valley TV English 2012

The Holography Business, Display Holography and Creative holographers

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
42:45 River Valley TV English 2012

Holography, relativity and the spooky ellipsoids

The further away from a house we move, the smaller it appears. We could say that we are in the centre of a “sphere of observation”, which must reach the house before we can see it. The larger that sphere is, the smaller the house appears. This is natural to us and not difficult to understand. In Einstein’s Special Relativity it is stated that the faster we move past a house, the shorter it appears. We state in this paper that this is because the faster we travel, the more our “sphere of observation” is elongated into an “ellipsoid of observation”. The longer that ellipsoid is, the shorter the house appears. This contraction is not so natural to us, because to be observable the velocity has to be extremely high, almost close to the velocity of light. A similar phenomenon can, however, be studied when holography with ultrashort pulses is used for measurement. In this case the sphere of observation is also transformed into an ellipsoid of observation. Thus, according to our approach objects appear shorter because the definition of length (the metre) becomes longer, just as time moves slower because the definition of time (the second) becomes longer. The transformation of the sphere into an ellipsoid is however hidden to the observer both in the case of holography and in relativity. This spooky behaviour of the ellipsoid has resulted in a new mathematical theorem.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
33:18 River Valley TV English 2012

Colour holography

The state of the art of colour holography is presented. The laser wavelength selection issue is investigated through computer simulation, showing that more than three wavelengths are needed for accurate colour rendition in holograms. In addition, the recording material is very important for creating high-quality colour holograms. The demand on the material and suitable products currently on the market are covered. The future of colour holography is highly dependent on the availability o improved panchromatic recording materials. Recording colour holograms, either directly or by computer, as well as digital printing of such holograms are mentioned. The light sources for displaying the holograms are important. Small laser diodes as well as powerful white LEDs and OLEDs with very limited source diameters are important for colour holography to improve image quality over today’s commonly used halogen lights.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
28:14 River Valley TV English 2012

Holography in the history of Comtemporary Art

Art movements such as Op-Art, Kinetic Art, Light Art and Conceptual Art have been predecessors as well as contemporary tendencies to the use of holography as an art media. Apart from the obvious historical nexus, there are relevant technical, formal and significant similarities and differences in relation to some of the works created by relevant artists as well as to the main features of those art tendencies. This paper explains the conclusions on a study from a triple semiotic approach: lexical, semantic and pragmatic. On the other hand, holography is an art media, such as painting, sculpture, printmaking, photography, cinema, etc. Like all of these, holography offers some essential features that are unique and representative of the possibilities of the media itself. In this paper we explore those features as well as some key issues in relation to the aesthetics of holography media. An ontological review is undertaken for contextualizing holography according to the Perception Aesthetic, the Participative Aesthetic and the Generative Aesthetic related concepts. Finally, in order to contextualize holography in relation to the most contemporary art tendencies, we explore the relationship between holography and digital media. As photography forced painting to redefine itself in the nineteenth century, nowadays computers have a similar effect on both traditional and other emerging artistic media such as holography. According to experts in the field, some of the most outstanding characteristics of digital media are: Immateriality, Reproducibility, Time Essence, Interactivity and Non-Linearity. This paper explores the possibilities offered by holography in that emerging digital framework.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
24:48 River Valley TV English 2012

"Presence": A review of holographic works exhibited at the Butler Institute of American Art

The following is a review of holographic art works spanning several different themes. Each theme could be an exhibition in its own right. In 2004 I staged an exhibit at the Butler Institute of American Art which included several pieces from each group. It was my intention to get some of these works out and into the public and see what they looked like before expanding on a given theme. Many of them had remained unframed and unviewed for years. Some were new. The themes addressed were; Nature Studies, Portraits, Abstracts and Gilded Lilies-religious art holographically visited.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
24:19 River Valley TV English 2012

The Evolution of Pseudo Colour Reflection Holography

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
22:30 River Valley TV English 2012

MesoOptics

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
12:13 River Valley TV English 2012

Words & Images in Time & Space:

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
05:22 River Valley TV English 2012

The prime illusion: Modern holography in the age of digital media

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
40:37 River Valley TV English 2012

Architectural Application and Maintenance for Art Holography

It has been 20 years since I began applying holograms to architectural spaces. Since then, a number of works, which are permanently installed in architectural spaces, have been created. However, some of my works had to be removed from their original places or moved to new places. This thesis is a report on three works that had to be moved from their original spaces to new ones. A change of location for works requires a special type of effort, which is required not only for art in general but also for holograms. This thesis will describe two different cases: the case in which the works were moved and installed without changing their original forms, and one in which the works were modified and re-installed.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
16:12 River Valley TV English 2012

Electronic holography at infrared and terrahertz

We describe a new holography system for recording holograms that is practical from 1 mm through 3 µm wavelengths. These hitherto inaccessible bands of wavelength can now be recorded with excellent sensitivity and resolution using microbolometer arrays that have improved greatly in the past few years. These spectral bands are useful for biomedical imaging as an alternative to x-rays in some situations, for astronomy, for industry and for night vision devices. In holography following Leith and Upatnieks, one records an interference pattern using a coherent source; and thereafter, reconstructs a wavefront which reproduces the phases and amplitudes of the original object waves. For our first experiments we will describe the verification of our assertion that one can truly record interference patterns. We use a simple Mach–Zehnder interferometer with laser illumination at 10.6 µm. It is interesting that one can record the carrier frequency fringe of a hologram using a thermal detector even with a time constant of tens of milliseconds. For reconstructing the object wavefront in holography there are several well-known techniques. First, one needs to choose between an original illumination beam and a reversed beam. Then one can consider scaling the hologram to the visible band. Finally, with the hologram digitally recorded, one can use modern computer-generated visual displays. We will describe our experiments in which we use the efficient, direct sampling of the carrier frequency fringes [9,10]. Using well-known theories for the inverse scattering and the digital computer, one can calculate the field and the intensity back in the object space. Details of the phase unwrapping process will be described. This talk is dedicated to Professors Emmett N. Leith and Stephen A. Benton, eminent scholars and beloved colleagues.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
21:21 River Valley TV English 2012

Optical watermarking system by digital holography

We propose and analyze an optical watermarking system based on a digital holographic technique. This system constructs a digital holographic watermark by the modified Mach-Zehnder interferometric architecture, and watermark detection is implemented using an optically VanderLugt 4-f correlator with a weighting matched filter mask. The correlation signal at the output plane can be used to recognize whether there is an authorized mark pattern in the watermarked image. In addition, we examine the nonlinear effect of the optical device on the correlation output. The output of the nonlinear device is considered as a mask of matched filter in the Fourier transform domain of an optically VanderLugt 4-f correlator. Through theoretical results, we provide an analytical solution for the correlation output of the nonlinear watermarking system.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
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