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posted by janrinok on Friday July 31 2015, @11:17PM   Printer-friendly
from the HiFi-WiFi-LiFi dept.

Researchers at Arizona State University have demonstrated the world's first white lasers:

The researchers have created a novel nanosheet – a thin layer of semiconductor [...] – with three parallel segments, each supporting laser action in one of three elementary colors. The device is capable of lasing in any visible color, completely tunable from red, green to blue, or any color in between. When the total field is collected, a white color emerges.

[...] The technological advance puts lasers one step closer to being a mainstream light source and potential replacement or alternative to light emitting diodes (LEDs). Lasers are brighter, more energy efficient, and can potentially provide more accurate and vivid colors for displays like computer screens and televisions. Ning's group has already shown that their structures could cover as much as 70 percent more colors than the current display industry standard.

Another important application could be in the future of visible light communication in which the same room lighting systems could be used for both illumination and communication. The technology under development is called Li-Fi for light-based wireless communication, as opposed to the more prevailing Wi-Fi using radio waves. Li-Fi could be more than 10 times faster than current Wi-Fi, and white laser Li-Fi could be 10 to 100 times faster than LED based Li-Fi currently still under development.

A monolithic white laser [abstract]

See also our story last year: Philips Launches "Intelligent LED Lighting" for Retail Stores.


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  • (Score: 2) by TheLink on Saturday August 01 2015, @01:57AM

    by TheLink (332) on Saturday August 01 2015, @01:57AM (#216609) Journal

    https://en.m.wikipedia.org/wiki/Color_rendering_index [wikipedia.org]

    The thing about lighting is the light doesn't go straight to your eyes but reflects off stuff.So if the light has just three very skinny bands of r g b, something that is orange might appear red or dark red or even black if it only reflects a specific wavelength most of us see as orange.

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  • (Score: 3, Interesting) by TheLink on Saturday August 01 2015, @02:04AM

    by TheLink (332) on Saturday August 01 2015, @02:04AM (#216610) Journal
    So because it's not real white imagine what you will see if that fake white hits a prism.no pretty rainbow of colors just red green blue.So many butterflies and birds will look different. Narrow band pigments too.