Nav: Home

The hidden ability of synchrotron radiation to perform coherent control

November 07, 2019

Coherent control is a method to manipulate the populations and pathways in matters by light and is currently one of the most attractive research areas in optical physics and photochemistry. Lasers have been considered as unique light source enabling one to perform coherent control, and, thanks to the development of laser technology, the on-going research is moving rapidly into the regime of extreme ultraviolet wavelength.

Synchrotron radiation from relativistic electrons is widely-used light with a continuous spectrum extending as far as the hard X-ray range. Synchrotron radiation is usually considered as being of poor temporal coherence, therefore nobody thought that it has a hidden capability of coherent control. Yasumasa Hikosaka (University of Toyama), Tatsuo Kaneyasu (SAGA Light source / Institute for Molecular Science (IMS) ), Masahiro Katoh (Hiroshima University / IMS) and co-workers have demonstrated this capability by achieving wave-packet interferometry on electron wave packets generated in Helium atoms.

The researchers employed two identical undulators installed into a straight section of the UVSOR-III storage ring at Okazaki, Japan. The twin undulators generated a pair of linearly-polarized electromagnetic wave packets, where each of the light wave packets has a duration of ~1.8 fs and the delay time between them can be adjusted with attosecond precision. The researchers' idea is that the longitudinal coherence between the two of the light wave packets can be utilized in implementing coherent control. The researchers shined Helium atoms with synchrotron radiation from the twin undulators, and generated in Helium an electron wave packet pair transcribed from the light wave packet pair. They demonstrated that the populations of the individual excited states can be controlled by adjusting the interference between the electron wave packets.

This prototypical experiment verified the novel coherent-control framework with synchrotron radiation. There is no technical restriction on the application of this coherent-control concept at shorter wavelengths to which lasers could hardly reach soon. This unexploited capability of synchrotron radiation will advance the frontier of coherent-control technology.
-end-


National Institutes of Natural Sciences

Related Lasers Articles:

Lasers etch a 'perfect' solar energy absorber
In Light: Science and Applications, University of Rochester researchers demonstrate how laser etching of metallic surfaces creates the ''perfect solar energy absorber.'' This not only enhances energy absorption from sunlight, but also reduces heat dissipation at other wavelengths.
Fusion by strong lasers
Nuclear physics usually involves high energies, as illustrated by experiments to master controlled nuclear fusion.
Using lasers to study explosions
An explosion is a complex event involving quickly changing temperatures, pressures and chemical concentrations.
Powerful lasers for fragile works of art
Protecting artworks from the effects of aging requires an understanding of the way materials alter over time.
Colliding lasers double the energy of proton beams
Researchers from Sweden's Chalmers University of Technology and the University of Gothenburg present a new method which can double the energy of a proton beam produced by laser-based particle accelerators.
Physicists propose perfect material for lasers
Weyl semimetals are a recently discovered class of materials, in which charge carriers behave the way electrons and positrons do in particle accelerators.
Lasers make magnets behave like fluids
Researchers have discovered how magnets recover after being blasted by a laser.
Spin lasers facilitate rapid data transfer
Engineers have developed a novel concept for rapid data transfer via optical fibre cables.
Flying focus: Controlling lasers through time and space
Scientists have produced an extremely bright spot of light that can travel at any speed -- including faster than the speed of light.
The cure for chaotic lasers? More chaos, of course
An international, Yale-led research team has taken a new approach to stabilizing high-power lasers: They're fighting chaos with chaos.
More Lasers News and Lasers Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Teaching For Better Humans 2.0
More than test scores or good grades–what do kids need for the future? This hour, TED speakers explore how to help children grow into better humans, both during and after this time of crisis. Guests include educators Richard Culatta and Liz Kleinrock, psychologist Thomas Curran, and writer Jacqueline Woodson.
Now Playing: Science for the People

#556 The Power of Friendship
It's 2020 and times are tough. Maybe some of us are learning about social distancing the hard way. Maybe we just are all a little anxious. No matter what, we could probably use a friend. But what is a friend, exactly? And why do we need them so much? This week host Bethany Brookshire speaks with Lydia Denworth, author of the new book "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond". This episode is hosted by Bethany Brookshire, science writer from Science News.
Now Playing: Radiolab

Dispatch 3: Shared Immunity
More than a million people have caught Covid-19, and tens of thousands have died. But thousands more have survived and recovered. A week or so ago (aka, what feels like ten years in corona time) producer Molly Webster learned that many of those survivors possess a kind of superpower: antibodies trained to fight the virus. Not only that, they might be able to pass this power on to the people who are sick with corona, and still in the fight. Today we have the story of an experimental treatment that's popping up all over the country: convalescent plasma transfusion, a century-old procedure that some say may become one of our best weapons against this devastating, new disease.   If you have recovered from Covid-19 and want to donate plasma, national and local donation registries are gearing up to collect blood.  To sign up with the American Red Cross, a national organization that works in local communities, head here.  To find out more about the The National COVID-19 Convalescent Plasma Project, which we spoke about in our episode, including information on clinical trials or plasma donation projects in your community, go here.  And if you are in the greater New York City area, and want to donate convalescent plasma, head over to the New York Blood Center to sign up. Or, register with specific NYC hospitals here.   If you are sick with Covid-19, and are interested in participating in a clinical trial, or are looking for a plasma donor match, check in with your local hospital, university, or blood center for more; you can also find more information on trials at The National COVID-19 Convalescent Plasma Project. And lastly, Tatiana Prowell's tweet that tipped us off is here. This episode was reported by Molly Webster and produced by Pat Walters. Special thanks to Drs. Evan Bloch and Tim Byun, as well as the Albert Einstein College of Medicine.  Support Radiolab today at Radiolab.org/donate.