source:eurekalertmechanoluminescent materials are subjected to external mechanical stress, they emit visible or invisible light. Such excitation can occur due to bending or gentle pressure, for example, but also completely contact-free through ultrasound. In this way, the effect can be triggered remotely and light can be brought to places that normally tend to be in the dark, for example in the human body. If the ultrasound treatment is to be used at the same time to generate local heat, it is important in such a sensitive environment to observe closely the temperatures that occur. Material sc...
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source:laserfocusworldSince the laser’s invention in 1961, it has offered unprecedented opportunities for scientific research and industrial applications, thanks to its unmatched superiority over traditional light sources. Enormous advances in laser performance have been made since, such as shorter laser pulses, higher peak intensities, or more power. The ultrafast laser is the most scientifically sought after.The titanium-doped sapphire (Ti:sapphire) laser has always been the superstar of ultrafast lasers since its first introduction in 1986, because of its broad gain bandwidth. 40 years late...
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2022
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source:phys.orgErbium-doped fiber amplifiers (EDFAs) are devices that can provide gain to the optical signal power in optical fibers. They are often used in long-distance communication fiber optic cables and fiber-based lasers. Invented in the 1980s, EDFAs have profoundly impacted our information society enabling signals to be routed across the Atlantic and replacing electrical repeaters.What is interesting about erbium ions in optical communications is that they can amplify light in the 1.55 mm wavelength region, which is where silica-based optical fibers have the lowest transmission loss. Th...
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2022
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Energy From Vibrating Micromagnets Power the Wireless Sensors in the Most Efficient Way source:azomThe Internet of Things, or the wireless interconnection of everyday objects, is based on wireless sensor networks, which require a low but consistent supply of electrical energy. Electromagnetic energy harvesters, which produce energy straightforwardly from the environment, can provide this.Lise-Marie Lacroix of the Université de Toulouse in France worked with colleagues from Toulouse, Grenoble, and Atlanta, Georgia, to improve the design of one such energy harvester so that it produces...
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2022
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