Laser
hideA laser is a device that emits light (electromagnetic radiation) through a process called stimulated emission. The term laser is an acronym for light amplification by stimulated emission of radiation. Laser light is usually spatially coherent, which means that the light either is emitted in a narrow, low-divergence beam, or can be converted into one with the help of optical components such as lenses. Typically, lasers are thought of as emitting light with a narrow wavelength spectrum ("monochromatic" light). This is not true of all lasers, however: some emit light with a broad spectrum, while others emit light at multiple distinct wavelengths simultaneously. The coherence of typical laser emission is distinctive. Most other light sources emit incoherent light, which has a phase that varies randomly with time and position.
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News tagged with laser
Physicists lay the groundwork for cooler, faster computing
Dec 14, 2009 |
4.8 / 5 (19) |
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University of Toronto quantum optics researchers Sajeev John and Xun Ma have discovered new behaviours of light within photonic crystals that could lead to faster optical information processing and compact computers that ...
Miracle light: Can lasers solve the energy crisis?
6 hours ago |
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Next year will mark the 50th birthday of the laser, one of the most productive and widely used mega-inventions of the last century. Scientists hope that 2010 also will see the launch of laser technology's greatest challenge: ...
New structure could produce efficient semiconductor laser sources
Dec 14, 2009 |
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(PhysOrg.com) -- University of Wisconsin-Madison researchers have achieved a nanoscale laser structure they anticipate will produce semiconductor lasers in the next two years that are more than twice as efficient ...
Whose Tattoo Is It Anyway?
Dec 14, 2009 |
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(PhysOrg.com) -- An infra-red digital camera could be a crucial tool in the fight against crime when trying to identify suspects by their tattoos, according to new University of Derby research.
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NASA unveils latest results from lunar mission
Space & Earth / Space Exploration
6 hours ago |
4.3 / 5 (3) |
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NASA's current mission in orbit around the moon, the Lunar Reconnaissance Orbiter, or LRO, has been providing crucial insights about our nearest celestial neighbor since its launch in June. At a scientific ...
World's first skeletal mount of Paluxysaurus jonesi reveals new biology
Other Sciences / Archaeology & Fossils
11 hours ago |
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(PhysOrg.com) -- The Early Cretaceous sauropod Paluxysaurus jonesi weighed 20 tons, was 60 feet long and had a neck 26 feet long, according to scientists who prepared the world's first full skeletal mount ...
Scientists Investigate Cause of 'Singing Dunes'
16 hours ago |
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(PhysOrg.com) -- In more than 30 locations around the world, the phenomenon of singing sand dunes has intrigued explorers, tourists, and scientists. When an avalanche occurs or even when the sand is pushed ...
Steroid injections may slow diabetes-related eye disease
18 hours ago |
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Injecting the corticosteroid triamcinolone into the eye may slow the progression of diabetic retinopathy, a complication of diabetes that can cause vision loss and blindness, according to a report in the December issue of ...
Slam dunk for future smart robots
Dec 14, 2009 |
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(PhysOrg.com) -- 'What does the world look like' and 'where am I' are two questions robots must solve if they are to act autonomously in an unknown environment. Work by European researchers will help future ...
AOptix Technologies and NuCrypt demonstrate physical-layer quantum encryption
Dec 14, 2009 |
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AOptix Technologies, a leading edge developer of ultra-high bandwidth laser communication solutions, and NuCrypt, a provider of technology for ultra-high security over optical communication networks, disclosed today the recent ...
Tracking new cancer-killing particles with MRI
Nanotechnology / Nanomaterials
Dec 14, 2009 |
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Researchers at Rice University and Baylor College of Medicine (BCM) have created a single nanoparticle that can be tracked in real time with MRI as it homes in on cancer cells, tags them with a fluorescent ...
Light-generating transistors to power labs on chips
Dec 11, 2009 |
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(PhysOrg.com) -- What started out as 'blue-sky' thinking by a group of European researchers could ultimately lead to the commercial mass production of a new generation of optoelectronic components for devices ...
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