Physics

Webcams offer a low-cost way to tune lasers for serious science

Every photon in a laser beam marches in lockstep, at an identical wavelength that depends on what the laser is used for – for example, infrared lasers that drive the optic fiber internet. For many applications, lasers need to be precisely tuned to those wavelengths, and the wavelength-measuring instruments can be more expensive than the lasers themselves.

2012 Awards Presented For Achievements in Earth Remote Sensing

NASA and the Department of the Interior's U.S. Geological Survey (USGS) presented the 2012 William T. Pecora awards for achievement in earth remote sensing to Gilberto Camara of Brazil's National Institute for Space Research and Leung Tsang of the University of Washington in Seattle.

NASA'S John Grunsfeld Speaks With Media About New Mars Mission

NASA's associate administrator for science, astronaut John Grunsfeld, today announced plans for a robust multi-year Mars program, including a new robotic science rover to launch in 2020.

NASA Announces Robust Multi-Year Mars Program; New Rover To Close Out Decade Of New Missions

Building on the success of Curiosity's Red Planet landing, NASA has announced plans for a robust multi-year Mars program, including a new robotic science rover set to launch in 2020.

Climate Models Project Increase in U.S. Wildfire Risk

Scientists using NASA satellite data and climate models have projected drier conditions likely will cause increased fire activity across the United States in coming decades.

NASA Opportunity Rover Finishes Walkabout On Mars Crater Rim

The latest work assignment for NASA's long-lived Mars rover Opportunity is a further examination of an area where the robot just completed a walkabout.

Scientists develop indium-free organic light-emitting diodes

Scientists have discovered new ways of using a well-known polymer in organic light emitting diodes, which could eliminate the need for an increasingly problematic and breakable metal-oxide used in screen displays in computers, televisions, and cell phones.

Steps towards filming atoms dancing

With their ultra short X-ray flashes, free-electron lasers offer the opportunity to film atoms in motion in complicated molecules and in the course of chemical reactions. However, for monitoring this motion, the arrival time and the temporal profile of the pulses which periodically illuminate the system, must be precisely known. An international team of scientists has now developed a measurement technique that provides complete temporal characterization of individual FEL (free-electron laser) pulses at DESY's soft-X-ray free-electron laser, named FLASH.

Uncovering unique properties in a two-dimensional crystal: Potential for optoelectronics, solar cells, valleytronics

When the dry lubricant molybdenum disulfide is stripped down to a single layer of atoms, a tightly bound quasi-particle comprised of two electrons and a hole forms with unique spin and valley properties. The charged quasi-particles offer potential use in new solar cells and other electronic devices that are controlled by light or designed to control light, to study what physicists call "many-body interactions"and a new concept of electronics called valleytronics.

Steps towards filming atoms dancing

With their ultra short X-ray flashes, free-electron lasers offer the opportunity to film atoms in motion in complicated molecules and in the course of chemical reactions. However, for monitoring this motion, the arrival time and the temporal profile of the pulses which periodically illuminate the system, must be precisely known. An international team of scientists has now developed a measurement technique that provides complete temporal characterization of individual FEL (free-electron laser) pulses at DESY's soft-X-ray free-electron laser, named FLASH.

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