laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation.[1][2] Lasers differ from other sources of light because they emit light coherently. Its spatial coherence allows a laser to be focused to a tight spot, and this enables applications like laser cutting and laser lithography. Its spatial coherence also keeps a laser beam collimated over long distances, and this enables laser pointers to work. Laser also have high temporal coherence which allows them to have a very narrow spectrum, i.e., they only emit a single color of light. Their temporal coherence also allows them to emit pulses of light that only last a femtosecond.
For more information about laser check the Wikipedia article here
ZME Science posts about laser
An international team of physicists have used one of the world’s most powerful lasers to create an unusual kind of plasma made out of hollow atoms, by using a breakthrough technique which involved emptying atoms of electrons from the inside out, instead of working from the outer shells inwards. This bizarre physics experiment shows once again [...]
Trekkies have a reason to rejoice one again after Japanese researchers have successfully devised the first working phaser – a laser that shoots sound particles instead of light. It will take a while though until you’ll be able to zap your neighbors around with a sound canon, as the scientists still need to work around [...]
Physicists at the U.S. Department of Energy’s (DOE) SLAC National Accelerator Laboratory, once home to the longest particle accelerator for nearly fifty years, have used the world’s most powerful X-ray laser to distinguish at an atomic level the mechanisms of reaction of a catalyst in action. This unprecedented view will help scientists develop cleaner and [...]
We’re all familiar with laser weapons from SciFi movies and novels, but how far away is laser warfare from reality? Very close, if we’re to judge from the recently publicized test run of Rheinmetall Defense‘s 50kW high power laser that can melt through thick armor a kilometer away and shoot tiny mobile targets at twice the distance. [...]
A novel technique for cooling antimatter down to the point where it might become almost stationary might provide scientists with a better basis for studying one of the greatest modern mysteries today. Antimatter, as it name implies, is the total opposite of matter and when the two meet they cancel each other out. For instance [...]
Scientists at the University of Texas at Austin, in collaboration with colleagues in Taiwan and China, have developed what’s considered to be the world’s smallest laser; a device so tiny, that it’s invisible to the naked eye. The laser is heralded as a breakthrough in the emerging photonic technology with applications from computing to medicine. [...]
Curious enough, one hundred years after renowned physicist Max von Lauefirst used X-ray diffraction to unravel the intricate atomic architecture of molecules, a team of international scientists have analyzed tiny protein crystals at an unprecedent scale of resolution, premiering in the process the world’s first hard X-ray free-electron laser. Called the Linac Coherent Light Source at Stanford, the X-ray [...]
Most digital devices today, like displays or blue-ray disks, use lasers which emit the colors red, green and blue, which when combined can render any color in the visible spectrum of light. However, current technology requires a separate laser for each color, since they produce monochromatic light. A team of researchers at Brown University has [...]
Researchers at SLAC National Accelerator Laboratory have used the world’s most powerful X-ray laser fired upon a neon gas capsule and thus emit an avalanche of short wavelength X-rays,creating the first atom laser. The same laser was used to heat a lump of matter at over 2 million degrees Fahrenheit – hotter than the sun’s [...]
By harnessing the science of both quantum and nano physics, scientists at the Niels Bohr Institute have come up with an innovative new way of cooling semiconductor membranes by using laser light. Through this new technique, the researchers were able to cool the tiny, thin membrane from room temperature to -269 degrees Celsius. Paradoxically, the [...]
Anyone scarcely into Iron Man will tell you they wouldn’t want anything more for Christmas than a bone melting ray gun weapon bursting out of your palm. Well, that a fission core artificial heart, but that’s stretching it a bit too far with Santa. Patrick Priebe, a German lab technician, and firstly an Iron Man [...]
Junk is not only limited to our planet, we have a problem with space pollution as well. In 1978, a brilliant NASA researcher named Donald Kessler predicted that a collision between two pieces of space junk could trigger a cascade of further impacts, which would create a significant quantity of debris which would then cause [...]
The first experiments with this laser (Linac Coherent Light Source) have been given the green light at the Department of Energy’s SLAC National Accelerator Laboratory. The illuminating of objects and processing speed will take place at an unprecedented scale, promising groundbreaking research in physics, chemistry, biology and numerous other fields. “No one has ever had [...]
Think about the hottest thing that comes to your mind; probably, 90% of people would answer the Sun. But what if you found out that some scientists in Oxfordshire have heated matter to 10 million Celsius, hotter than the surface of the Sun, marking a major landmark in research, you’d probably change your mind. [...]
A laser is an electronic-optical device that produces coherent light radiation. It’s very useful in various fields, such as medicine (bloodless surgery, laser healing, survical treatment, kidney stone treatment, eye treatment, dentistry), industry (cutting, welding, material heat treatment, marking parts) research (Spectroscopy, laser ablation, Laser annealing, laser scattering) and many many others. Now picture the [...]
Tue, Mar 26, 2013
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