Dutch physicists from Leiden University have made an experimental laser that combines the advantages of two types of laser. With the experimental laser, which generates light in a sort of billiards table with round edges, the researchers have demonstrated that is possible to produce cheaper lasers.
A conventional laser reflects light between two very accurately positioned mirrors, the so-called resonant cavity. The distance between the mirrors determines which wavelength is amplified and therefore which colour of light remains. Conventional lasers are expensive due to the costs of the mirrors. This is because the mirrors in a laser have to be very accurately curved. Furthermore, the form and the quality of the mirrors must satisfy stringent technical specifications and the distance between the mirrors has to be set and maintained with extreme precision.
The random laser provides an alternative. Such a laser is much less sensitive to technical imperfections of the resonant cavity, for example. A random laser works with a large number of different light colours. Up until now this type of laser has worked using light-diffusing particles and this has a number of disadvantages. Physicists would prefer such lasers to make use of mirrors.
Nalinie Moerlie | alfa
UNH scientists help provide first-ever views of elusive energy explosion
16.11.2018 | University of New Hampshire
NASA keeps watch over space explosions
16.11.2018 | NASA/Goddard Space Flight Center
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
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16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences