Subscribe free to our newsletters via your
. 24/7 Space News .

Ultrafast laser technique developed to observe electron action
by Staff Writers
Orlando FL (SPX) May 16, 2014

This is Zheng Chang in his lab at UCF. Image courtesy UCF.

University of Central Florida physicist Zenghu Chang has done it again. For a third time this year, his research group has published an article in a Nature journal.

This time, Chang and his team have developed a new ultrafast light source for observing electron motion in molecules - made up of nuclei and electrons - at the point before the nuclei start to move. By being able to observe what actually happens, scientists can begin to understand how an electron interacts with other electrons, which may help improve the efficiency of solar cells.

"The charge migration that theorists have been predicting since 1999 happens so quickly we haven't been able to observe it yet," Chang said. "It's very exciting, because we have found a new way to build light sources that may allow us to see it in the future."

Being able to see this superfast interaction between electrons gives scientists another tool to unlock the rules that govern the quantum-mechanics world - a world where microscopic objects don't obey the laws of physics we have come to rely on for understanding in the macro world.

So how did Chang and his team manage to develop the new light source? The team borrowed an idea from Chang's earlier innovative work in the area of ultrafast lasers.

"We control the below-threshold harmonic light emission by using electromagnetic fields with time-dependent ellipticity, like we have done to the above-threshold high-order harmonics," said Chang referring to the creation of a 67-attosecond pulse of extreme ultraviolet light, which earned him international recognition.

"We thought: Could we use the same gating fields to show the dependence of the below-threshold harmonic intensity on the carrier-envelope phase of the driving laser? It took us some time to find the right experimental parameters, but the answer is yes."

The result of his study "Coherent phase-matched VUV generation by field-controlled bound states" appears this week in Nature Photonics.

Chang has been studying light and ultrafast lasers his entire career. This past year UCF established the Institute for the Frontier of Attosecond Science and Technology (FAST). The institute is a collaboration between experts and students in UCF's College of Optics and Photonics (CREOL) and the College of Sciences' physics department to focus on this field of science.

Co-authors include: Michael Chini, Xiaowei Wang, Yan Cheng, Yi Wu and Eric Cunningham from UCF's FAST; Peng-Cheng Li, John Heslar and Shih-I Chu from the Center for Quantum Science and Engineering and the Department of Physics at the National Taiwan University; He Wang from the Materials Sciences Division at the Lawrence Berkeley National Laboratory, and Dmitry A. Telnov from the Department of Physics at St. Petersburg State University in Russia.

"It was truly a collaborative effort," Chang said. "And there are certainly commercial applications. We're talking about cutting-edge lasers with potential application in electronics, navigation, communications and medicine."

Chang said he is excited about the new work because he hopes it will help lead to bigger and greater discoveries.

"My dream is to discover new physics that has not been predicted at this time," Chang said. "Until there was a microscope, we had no idea how complicated, how amazing cells were. What we are creating now are tools for magnifying time in order to discover what we have not even imagined yet. That's what I see for the future of our field."


Related Links
University of Central Florida
Space Technology News - Applications and Research

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Laser-powered farewell to Moon mission
Paris (ESA) Apr 29, 2014
Just before NASA's latest Moon mission ended last week, an ESA telescope received laser signals from the spacecraft, achieving data speeds like those used by many to watch movies at home via fibre-optic Internet. During an intense, three-day effort starting on 1 April, ESA's Optical Ground Station in Spain received data signals via laser from the Moon at the stunning speed of 80 megabits p ... read more

LRO View of Earth

Saturn in opposition tonight, will appear next to the moon

Russia to begin Moon colonization in 2030

Astrobotic Partners With NASA To Develop Robotic Lunar Landing Capability

When fantasy becomes reality: first seeds to be planted soon on Mars

NASA's Saucer-Shaped Craft Preps for Flight Test

Construction to Begin on NASA Mars Lander Scheduled to Launch in 2016

NASA Mars Rover Curiosity Wrapping Up Waypoint Work

Britain's Longitude Prize back after 300-year absence

Sea level rise forces US space agency to retreat

A light-speed voyage to the distant future

US spacecraft enters giant asteroid's orbit

Moon rover Yutu comes closer to public

The Phantom Tiangong

New satellite launch center to conduct joint drill

China issues first assessment on space activities

New ISS Expedition Unaffected by Proton Crash

US-Russian Tensions Roiling Outer Space Cooperation

Scientists Seek Answers With Space Station Thyroid Cancer Study

Rounding up the BCATs on the ISS

SpaceX's Dragon spacecraft returns to Earth from space station

SpaceX-3 Mission To Return Dragon's Share of Space Station Science

Third-stage engine glitch causes Proton-M accident

Russia's Roscosmos plans to launch two more Protons this year

Starshade Could Help Photograph Distant Planets

Giant telescope tackles orbit and size of exoplanet

Odd planet, so far from its star

New Exomoon Hunting Technique Could Find Solar System-like Moons

China says space debris recovered: report

MIPT Experts Reveal the Secret of Radiation Vulnerability

Physicists say they know how to turn light into matter

Australians report flaming object falling from sky

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.