Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Recommend this page:
To (Recipient's email address)
Your name (Optional)
From (Your email address)
Message (Optional)
Datenschutz-Hinweis: Die Mailadressen werden von uns weder gespeichert noch an Dritte weitergegeben. Sie werden ausschließlich zu Übertragungszwecken verwendet.

Physicist builds useful light source from harmonic generation

03.06.2014

A Kansas State University physicist's proposal may lead to a new way of creating tabletop light sources in the laboratory.

Cheng Jin, research associate in physics; Chii-Dong Lin, university distinguished professor of physics; and collaborators are developing a way to greatly enhance the generation of high-order harmonics to create powerful small tabletop light sources that are important to science and technology.


Kansas State University physicists are researching new ways of creating tabletop light sources in the laboratory.

The researchers are building theoretical framework and providing experimental guidance in the area of strong-field physics. The work is associated with the physics department's James R. Macdonald Laboratory.

"The ultimate goal of this research is to design any waveforms to control physical processes for different applications," Jin said.

... more about:
»X-ray »guidance »lasers »ultraviolet »waveform

The research appears in a recent Nature Communications article, "Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields." In the field of atomic, molecular and optical physics, it is rare for such a theoretical paper to be published in a multidisciplinary research journal such as Nature Communications, Jin said.

Other Kansas State University researchers involved include Anh-Thu Le, research associate professor of physics; Hui Wei, doctoral student in physics; and Guoli Wang, visiting scholar in physics and associate professor at Northwest Normal University in China.

High-order harmonic generation is an extreme nonlinear process when intense infrared lasers are focused in a gas medium. When used with the right filters, high-order harmonic generation pulses, which range from extreme ultraviolet to X-ray, can be used for numerous applications in science and technology.

For example, the emitted harmonics can produce isolated attosecond pulses or attosecond pulse trains. An attosecond is one-billionth of a billionth of a second. These attosecond pulses are used to study the dynamics of atoms, molecules and condensed media, and to investigate their evolution at the femtosecond and attosecond timescales. A femtosecond is one-millionth of a billionth of a second.

"High-order harmonic generation has been considered a very promising way to provide the tabletop coherent light sources in the extreme ultraviolet to X-ray regions, but so far is limited by its low intensity," Jin said.

While Jin has extensively studied high-order harmonic generation, the latest publication proposes a method of synthesizing two- or three-color lasers to optimize the intensity of high-order harmonic generation.

"Our method can greatly enhance the harmonic intensity by one to two orders of magnitude without the increase of total laser power," Jin said. "With the emerging intense high-repetition megahertz lasers, this paves a way to make high-order harmonic generation as a useful light in the coming years."

While laser technology of synthesizing two- or three-color lasers already exists, without the guidance of their work it is difficult to locate the laser parameters, such as laser intensities and relative phases between each two colors to form a waveform that optimizes the harmonic intensity in the laboratory by taking trial-and-error methods, Jin said. When these waveform-optimized laser pulses are combined with the emerging high-repetition megahertz lasers, they can generate high harmonics that are much higher than what is available today.

Lin's research group plans future research in the area of strong-field physics.

The group is exploring how to eliminate atto-chirp with a designed waveform, how to achieve the optimized waveform in the gas-filled hollow-core waveguide and how to optimize the waveforms over multiple optical cycles to enhance the intensity of the single harmonic.

"We expect waveform control of intense laser pulses will lead the next wave of research in strong-field physics and the theoretical study carried out in this work is essential for this research to move forward," Jin said.

Jin's previous research on high-order harmonic generation has been summarized in his book, "Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium." The book was published by Springer in 2013 and supervised by Lin.

Source
Cheng Jin
785-532-1635
cjin@k-state.edu


Pronouncer
Cheng Jin is Chang Gin

Cheng Jin | Eurek Alert!
Further information:
http://www.k-state.edu/media/newsreleases/jun14/jin6214.html

Further reports about: X-ray guidance lasers ultraviolet waveform

More articles from Physics and Astronomy:

nachricht A blueprint for clearing the skies of space debris
17.04.2015 | RIKEN

nachricht Quantum Physics – Hot and Cold at the Same Time
17.04.2015 | Ruprecht-Karls-Universität Heidelberg

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Astronomers reveal supermassive black hole's intense magnetic field

Astronomers from Chalmers University of Technology have used the giant telescope Alma to reveal an extremely powerful magnetic field very close to a supermassive black hole in a distant galaxy

Astronomers from Chalmers University of Technology have used the giant telescope Alma to reveal an extremely powerful magnetic field very close to a...

Im Focus: A “pin ball machine” for atoms and photons

A team of physicists from MPQ, Caltech, and ICFO proposes the combination of nano-photonics with ultracold atoms for simulating quantum many-body systems and creating new states of matter.

Ultracold atoms in the so-called optical lattices, that are generated by crosswise superposition of laser beams, have been proven to be one of the most...

Im Focus: UV light robot to clean hospital rooms could help stop spread of 'superbugs'

Can a robot clean a hospital room just as well as a person?

According to new research out of the Texas A&M Health Science Center College of Medicine, that is indeed the case. Chetan Jinadatha, M.D., M.P.H., assistant...

Im Focus: Graphene pushes the speed limit of light-to-electricity conversion

Researchers from ICFO, MIT and UC Riverside have been able to develop a graphene-based photodetector capable of converting absorbed light into an electrical voltage at ultrafast timescales

The efficient conversion of light into electricity plays a crucial role in many technologies, ranging from cameras to solar cells.

Im Focus: Study shows novel pattern of electrical charge movement through DNA

Electrical charges not only move through wires, they also travel along lengths of DNA, the molecule of life. The property is known as charge transport.

In a new study appearing in the journal Nature Chemistry, authors, Limin Xiang, Julio Palma, Christopher Bruot and others at Arizona State University's...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

HHL's Entrepreneurship Conference on FinTech

13.04.2015 | Event News

World Conference On Regenerative Medicine 2015: Registration And Abstract Submission Now Open

25.03.2015 | Event News

University presidents from all over the world meet in Hamburg

19.03.2015 | Event News

 
Latest News

Engineer Improves Rechargeable Batteries with MoS2 Nano 'Sandwich'

17.04.2015 | Power and Electrical Engineering

Comparing Climate Models to Real World Shows Differences in Precipitation Intensity

17.04.2015 | Earth Sciences

A blueprint for clearing the skies of space debris

17.04.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>