Scientists at Ohio State University have found that a special type of glass that is finding use in the electronics industry softens when exposed to very low-level laser light, and hardens back into its original condition when the light is switched off.
The discovery -- made by accident as physicists were trying to study properties of the material -- may one day enable new uses for the glass. Ratnasingham Sooryakumar said that he and former doctoral student Jared Gump thought they were working with a bad batch of germanium-selenium glass when Gump was testing the material’s hardness in the laboratory and couldn’t reproduce his results. “Every day he got a different result,” recalled Sooryakumar, a professor of physics at Ohio State. “It took us a while to realize that the material was fine, it was just very sensitive to light.”
They finally traced their strange results to the very low-power laser light that they were shining on the glass. Whether the laser was set to exactly the same power every time shouldn’t have affected the experiment, but it did. The higher the laser power, the softer the glass. In fact, with the laser set to a mere 6 milliwatts –- six thousandths of a Watt -- the material became 50 percent softer than usual. “Normally, you’d have to almost melt the glass to get it that soft, but here we were doing it with a light source that was essentially a laser pointer, and with no heat at all,” said Sooryakumar. “And what’s really important is that the whole effect is reversible.”
Ratnasingham Sooryakumar | EurekAlert!
Significantly more productivity in USP lasers
06.12.2016 | Fraunhofer-Institut für Lasertechnik ILT
Shape matters when light meets atom
05.12.2016 | Centre for Quantum Technologies at the National University of Singapore
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine