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
Tapering a Free-Electron Laser to Extract More Juice
Nov 20, 2009 |
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(PhysOrg.com) -- Researchers from the NSLS and Science Applications International Corporation (SAIC) have demonstrated a technique that could be used to significantly improve the quantity and quality of light ...
Ultra-Powerful Laser Reproduces How Star's Jets Travel through Interstellar Space
Nov 20, 2009 |
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(PhysOrg.com) -- A multi-trillion-watt laser at the University of Rochester has simulated a stellar jet -- an outpouring of matter from a fledgling star -- with unprecedented realism.
Laser therapy can aggravate skin cancer
Nov 20, 2009 |
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High irradiances of low-level laser therapy (LLLT) should not be used over melanomas. Researchers writing in the open access journal BMC Cancer studied the pain relieving, anti-inflammatory 'cold laser', finding that it cau ...
ORNL, Los Alamos pioneer new approach to assist scientists, farmers
Nov 19, 2009 |
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Sustainable farming, initially adopted to preserve soil quality for future generations, may also play a role in maintaining a healthy climate, according to researchers at the Department of Energy's Oak Ridge and Los Alamos ...
Toshiba develops molecular photoresist technology for EUV lithography
Nov 17, 2009 |
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Toshiba Corporation today announced that it has developed a high resolution photoresist (photo-sensitive film) essential for future application of EUV (extreme ultraviolet) lithography in semiconductor fabrication, ...
Building a more versatile laser
Nov 16, 2009 |
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(PhysOrg.com) -- One of the drawbacks associated with using semiconductor lasers is that many of them can only produce a beam of a single wavelength, and can only send that beam in one direction at a time. ...
Dell Launches World's Fastest Office Color Laser Printer
Electronics / Consumer & Gadgets
Nov 12, 2009 |
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(PhysOrg.com) -- Dell today announced three new commercial workgroup printers to help businesses of all sizes increase productivity and lower their total cost of printing.
Creating 3D models with a simple webcam (w/ Video)
Technology / Computer Sciences
Nov 11, 2009 |
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(PhysOrg.com) -- Constructing virtual 3D models usually requires heavy and expensive equipment, or takes lengthy amounts of time. A group of researchers at the University of Cambridge, Qi Pan, Dr Gerhard Reitmayr ...
Exploration by explosion: Studying the inner realm of living cells
Nov 11, 2009 |
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Scientists in Washington, DC, are reporting development and successful tests of a new way for exploring the insides of living cells, the microscopic building blocks of all known plants and animals. They explode ...
Vibrations key to efficiency of green fluorescent protein
Nov 11, 2009 |
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University of California, Berkeley, chemists have discovered the secret to the success of a jellyfish protein whose green glow has made it the darling of biologists and the subject of the 2008 Nobel Prize ...
Researchers using excimer laser angioplasty to blast arterial blockages in heart and kidneys
Nov 10, 2009 |
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(PhysOrg.com) -- Using an excimer laser to widen narrowed or obstructed blood vessels in hard-to-reach areas of heart and kidney arteries may be feasible and safe, according to a study by a team of researchers from the Virginia ...
Japan eyes solar station in space as new energy source
Nov 08, 2009 |
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It may sound like a sci-fi vision, but Japan's space agency is dead serious: by 2030 it wants to collect solar power in space and zap it down to Earth, using laser beams or microwaves.
Researcher: 'Optical biopsy' for breast cancer increasingly accurate
Nov 05, 2009 |
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(PhysOrg.com) -- Most biopsies following mammograms reveal benign abnormalities, not cancer. But women may not have to endure the medical costs, stress and potential complications that accompany such invasive biopsies forever. ...
Measuring distances in microseconds
Nov 05, 2009 |
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(PhysOrg.com) -- Standard laser devices are fast enough for measuring the size of a room, but they need to be faster for outdoor mobile applications. Researchers have brought these scanners up to speed -- ...
Success in 'space elevator' competition (Update 3)
Space & Earth / Space Exploration
Nov 05, 2009 |
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(AP) -- A robot powered by a ground-based laser beam climbed a long cable dangling from a helicopter on Wednesday to qualify for prize money in a $2 million competition to test the potential reality of the ...
