Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Holograms set for greatness

07.11.2013
A new technique that combines optical plates to manipulate laser light improves the quality of holograms

Holography makes use of the peculiar properties of laser light to record and later recreate three-dimensional images, adding depth to conventionally flat pictures.


A scanning mirror (right) redirects green laser light onto a tiled holographic plate (top) to produce high-quality three-dimensional images.
Copyright : 2013 A*STAR Data Storage Institute

Zhi Ming Abel Lum and co©workers at the A*STAR Data Storage Institute, Singapore, have now developed a method for increasing the number of pixels that constitute a hologram, thus enabling larger and more realistic three-dimensional images1.

Holographic imaging works by passing a laser beam through a plate on which an encoded pattern, known as a hologram, is stored or recorded. The laser light scatters from features on the plate in a way that gives the impression of a real three-dimensional object. With the help of a scanning mirror, the system built by Lum and his co-workers combines 24 of these plates to generate a hologram consisting of 377.5 million pixels. A previous approach by a different team only managed to achieve approximately 100 million pixels.

The researchers patterned the plates, made of a liquid-crystal material on a silicon substrate, with a computer-generated hologram. Conventionally, holograms are recorded by scattering a laser beam off a real object. ¡°Holograms can also be mathematically calculated,¡± explains Lum. ¡°This avoids problems, such as vibrations, associated with the conventional recording method that may reduce the quality of the final reconstructed image.¡±

Each plate, also called a spatial light modulator (SLM), consisted of an array of 1,280 by 1,024 pixels ¡ª 1.3 million in total. Simply stacking the plates to increase the total number of pixels, however, created ¡®optical gaps¡¯ between them. As a workaround, the researchers tiled 24 SLMs into an 8 by 3 array on two perpendicular mounting plates separated by an optical beam splitter. They then utilized a scanning mirror to direct the laser light from the combined SLM array to several predetermined positions, just as if they had all been stacked seamlessly together (see image).

The team demonstrated that by shining green laser light onto this composite holographic plate, they could create three-dimensional objects that replayed at a rate of 60 frames per second in a 10 by 3-inch (25 by 7.5-centimeter) display window.

This relatively simple approach for increasing the pixel count of holograms should help researchers develop three-dimensional holographic displays that are much more realistic than those commercially available at present. ¡°Our next step is to improve this ¡®tiling¡¯ approach to further scale up the number of pixels of the hologram, which will lead to a larger holographic image,¡± says Lum.

Journal information

Lum, Z. M. A., Liang, X. A., Pan, Y. C., Zheng, R. T. & Xu, X. W. Increasing pixel count of holograms for three-dimensional holographic display by optical scan-tiling. Optical Engineering 52, 015802 (2013).

A*STAR Research | Research asia research news
Further information:
http://www.a-star.edu.sg
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht New NASA study improves search for habitable worlds
20.10.2017 | NASA/Goddard Space Flight Center

nachricht Physics boosts artificial intelligence methods
19.10.2017 | California Institute of Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>