Tag Archives: laser

Researchers use lasers to supercool semiconductor membranes, blow your mind

Posted on January 24, 2012 in Grids, Immersive, Networks by dulce303

Ah, lasers. Those wonderful, super intense beams of light that we've seen used in headlights, projectors, and naturally, death rays. Like us, researchers at the Niels Bohr Institute at the University of Copenhagen figure there's nothing lasers can't do, and have figured out a way to use them to cool a bit of semiconducting material. This bit of black magic works using a membrane made of gallium arsenide and is based upon principles of quantum physics and optomechanics (the interaction between light and mechanical motion).

Turns out, when a one millimeter square membrane of gallium arsenide is placed parallel to a mirror in a vacuum chamber and bombarded with a laser beam, an optical resonator is created between them that oscillates the membrane. As the distance between the gallium arsenide and the mirror changes, so do the membrane's oscillations. And, at a certain frequency, the membrane is cooled to minus 269 degrees Celsius -- despite the fact that the membrane itself is being heated by the laser. So, lasers can both heat things up and cool them down simultaneously, and if that confuses you as much as it does us, feel free to dig into the science behind this paradoxical bit of research at the source below. In other news, left is right, up is down, and Eli Manning is a beloved folk hero to all Bostonians.

Researchers use lasers to supercool semiconductor membranes, blow your mind originally appeared on Engadget on Tue, 24 Jan 2012 12:22:00 EDT. Please see our terms for use of feeds.

Permalink TG Daily  |  sourceNiels Bohr Institute  | Email this | Comments

Way-Go flashlight uses lasers to light your path, GPS to tell you where to go

Posted on January 18, 2012 in Grids, Immersive, Mixed Reality, Networks, Uncategorized by dulce303

We love just about anything involving lasers or robotics here at Engadget, so naturally, we're intrigued by Sriranjan Rasakatla's Way-Go flashlight that combines the two. It's comprised of a laser pico projector, GPS module, altitude and heading reference system (AHRS) to not only light your path but also tell you which way to go. It can be used strictly as a flashlight, but users can also input starting and destination points to have the Way-Go guide them. There's also a wander mode that displays info about your surroundings as you stroll around -- though naturally, such information must be pre-programmed into the device. Because it displays stuff that needs reading, the projector's connected to servos that can keep it locked on a projection point to keep it readable no matter how much you move the Way-Go around. Rasakatla sees the device being useful in search and rescue, backcountry trekking, and campus tour guiding -- odd, 'cause in our day, kids walking around campus at night were trying to find out where the party was at, not learn about the architecture of the academic buildings. Regardless, you can see the Way-Go in action after the break.

Continue reading Way-Go flashlight uses lasers to light your path, GPS to tell you where to go

Way-Go flashlight uses lasers to light your path, GPS to tell you where to go originally appeared on Engadget on Tue, 17 Jan 2012 20:42:00 EDT. Please see our terms for use of feeds.

Permalink Hack a Day  |  sourceSriranjan's Blog  | Email this | Comments