More luminous and energy efficient than LEDs, white lasers look to be the future in lighting and Li-Fi, or light-based wireless communication
While lasers were invented in 1960 and are commonly used in many applications, one characteristic of the technology has proven unattainable. No one has been able to create a laser that beams white light.
Researchers at Arizona State University have solved the puzzle. They have proven that semiconductor lasers are capable of emitting over the full visible color spectrum, which is necessary to produce a white laser.
The researchers have created a novel nanosheet — a thin layer of semiconductor that measures roughly one-fifth of the thickness of human hair in size with a thickness that is roughly one-thousandth of the thickness of human hair — 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 researchers, engineers in ASU’s Ira A. Fulton Schools of Engineering, published their findings in the July 27 issue of the journal Nature Nanotechnology. Cun-Zheng Ning, professor in the School of Electrical, Computer and Energy Engineering, authored the paper, “A monolithic white laser,” with his doctoral students Fan Fan, Sunay Turkdogan, Zhicheng Liu and David Shelhammer. Turkdogan and Liu completed their Ph.Ds. after this research.
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.
“The concept of white lasers first seems counterintuitive because the light from a typical laser contains exactly one color, a specific wavelength of the electromagnetic spectrum, rather than a broad-range of different wavelengths. White light is typically viewed as a complete mixture of all of the wavelengths of the visible spectrum,” said Ning, who also spent extended time at Tsinghua University in China during several years of the research.
In typical LED-based lighting, a blue LED is coated with phosphor materials to convert a portion of the blue light to green, yellow and red light. This mixture of colored light will be perceived by humans as white light and can therefore be used for general illumination.
Sandia National Labs in 2011 produced high-quality white light from four separate large lasers. The researchers showed that the human eye is as comfortable with white light generated by diode lasers as with that produced by LEDs, inspiring others to advance the technology.
“While this pioneering proof-of-concept demonstration is impressive, those independent lasers cannot be used for room lighting or in displays,” Ning said. “A single tiny piece of semiconductor material emitting laser light in all colors or in white is desired.”
The Latest on: White lasers
via Google News
The Latest on: White lasers
- Mysterious Object Northrop Is Barging From Redondo Beach Is A High-Power Naval Laseron October 19, 2019 at 5:44 am
It also looks like a streamlined version of the Solid-State Laser Testbed, or SSLT, which the Army tested a number of years ago at White Sands Missile Range in New Mexico. This isn't all that ...
- Heart, soul and ‘precision lasers’: Dominick Reyes explains why he’s the one to dethrone Jon Joneson October 19, 2019 at 5:15 am
NFL 'Around The NFL' crew chooses favorite storylines of Week 7 'Around The NFL' crew chooses its favorite storylines of Week 7. NFL Hardy, White differ on use of inhaler during fight ...
- Firms now offer quality laser printers for less than $100on October 18, 2019 at 11:52 pm
The LaserJet Pro M15w takes up less than 8 by 14 inches of desk space and weighs just 8 pounds. Bob's first laser printer cost $5,500, was gigantic and weighed about 50 pounds. That was ...
- 9 Best Champagne Sabers: Your Easy Buying Guideon October 18, 2019 at 1:07 pm
This saber features a durable acrylic white marble handle along with a hand-forged blade designed to swiftly and expertly open any bottle of champagne. Each saber is finished with a laser-cut “State ...
- Laser Weapons On Stealth Jets: The Future of the U.S. Air Force?on October 18, 2019 at 3:09 am
Key Point: Near perfect precision, virtually unlimited ammunition, and an ability to disable more targets than ever before. On April 23, the Air Force Research Laboratory (AFRL) tested a fiber-optic ...
- President Trump’s claim that ‘when I came in, we had no ammunition’on October 18, 2019 at 1:00 am
Neither the White House nor the Defense Department responded to our questions ... guided preferred munitions’ such as Joint Direct Attack Munition (JDAM), Advanced Medium-Range Air-to-Air Missile ...
- Stealth Strike! U.S. Air Force Wants to Test F-35 Laser Weapons by 2021on October 16, 2019 at 4:33 pm
Ground testing of a laser weapon called the High Energy Laser, or HEL, has been underway at White Sands Missile Range, N.M., service officials said. The High Energy Laser tests are being conducted by ...
- Best Printer Paper for Laser and Inkjet Printers in 2019on October 14, 2019 at 12:05 pm
At 24 pounds a ream, the paper is equally optimized to withstand the heat generated by laser printers. The 100 bright and 163 white paper creates popping black text and vivid color image prints, ...
- Dana White Gunning to Make Israel Adesanya vs. Paulo Costa Fighton October 13, 2019 at 12:03 am
There's more ... we also spoke with White about Justin Gaethje-- who's been trying to draw out Conor McGregor for the past 7 months. Dana tells TMZ Sports ... Conor is currently laser-focused on a ...
- Laser Cleaning Machine Market 2019 Analysis and Precise Outlook: Trumpf, Rofin, Coherent, Laseraxon October 11, 2019 at 3:52 am
... Rofin CleanLASER Coherent Quantel Newport Corporation IPG Photonics Clean Lasersysteme Advanced Laser Technology (ALT) General Lasertronics White Lion Dry Ice & Laser Cleaning Technology Anilox ...
via Bing News