Raman scattering of hydrogen produces ultrashort-pulse light

June 27, 2014
Professor Masayuki Katsuragawa from the University of Electro-Communications in Tokyo has developed a new method to produce ultrashort-pulse light.
(Image credit: UEC)
Manipulation of the light-matter interaction of Raman scattering from hydrogen produces ultrashort-pulse-width light at terahertz repetition-rate frequencies.
Manipulation of the light-matter interaction of Raman scattering from hydrogen produces ultrashort-pulse-width light at terahertz repetition-rate frequencies.

Professor Masayuki Katsuragawa from the Department of Applied Physics and Chemistry at the University of Electro-Communications (UEC; Tokyo, Japan) has developed a new method to produce ultrashort-pulse light. "My research is focused on the manipulation of light-matter interaction for producing ultra-short pulses of laser light," says Katsuragawa. "Our recent experiments on adiabatic stimulated Raman scattering in parahydrogen show potential for the realization of laser light sources producing pulses at terahertz repetition-rate frequencies. These ultra-short pulses offer a new 'axis' in the evolution of laser based optical science."

RELATED ARTICLE: SRS chemical detection is insensitive to substrate's optical properties

Here, the new 'axis' refers to ultrahigh-repetition-rate trains of monocycle pulses (http://www.laserfocusworld.com/articles/print/volume-47/issue-8/features/photonic-frontiers-single-cycle-pulses-spectral-broadening-advances-quest-for-single-cycle-pulses.html) with precise control of the phase of the laser light pulses. Advances in the performance of powerful lasers, optical fibers, and peripheral technology have played a pivotal role in the proliferation of global telecommunications based on the transmission of 10 GHz pulses of light, says UEC. Notably, they say that the three most important properties of lasers for telecommunications are high power, single frequency, and ultrashort pulse width.

Recently, Katsuragawa and his colleagues demonstrated ultrashort pulse trains of 1.8 fs in duration with a repetition frequency of 125 THz by stimulated Raman scattering (SRS) produced in parahydrogen. "The critical point in these experiments was driving Raman coherence adiabatically, that is, without dissipation," explains Katsuragawa. "We achieved this by developing an injection-locked laser capable of emitting arbitrary pairs of two frequencies to irradiate the hydrogen gas, in order to control two photon detuning from the Raman resonance."

Recently, the UEC team produced higher-order series of SRS using two driving lasers by the introduction of a second harmonic in one of the lasers. The resulting emission referred to as a 'Raman comb' covered an octave spectrum range from the infrared to the ultraviolet.

"I am confident that our research has laid the foundations for the development of practical systems for the generation of trains of monocycle pulses with total control of the phase," says Katsuragawa.

SOURCE: UEC; http://www.ru.uec.ac.jp/e-bulletin/feature/2014/ultrashort-pulses-of-light-produced-by-raman-scattering-from-hydrogen-for-next-generation-laser-optical-communications.html

About the Author

Gail Overton | Senior Editor (2004-2020)

Gail has more than 30 years of engineering, marketing, product management, and editorial experience in the photonics and optical communications industry. Before joining the staff at Laser Focus World in 2004, she held many product management and product marketing roles in the fiber-optics industry, most notably at Hughes (El Segundo, CA), GTE Labs (Waltham, MA), Corning (Corning, NY), Photon Kinetics (Beaverton, OR), and Newport Corporation (Irvine, CA). During her marketing career, Gail published articles in WDM Solutions and Sensors magazine and traveled internationally to conduct product and sales training. Gail received her BS degree in physics, with an emphasis in optics, from San Diego State University in San Diego, CA in May 1986.

Sponsored Recommendations

How to Tune Servo Systems: The Basics

April 10, 2024
Learn how to tune a servo system using frequency-based tools to meet system specifications by watching our webinar!

Precision Motion Control for Sample Manipulation in Ultra-High Resolution Tomography

April 10, 2024
Learn the critical items that designers and engineers must consider when attempting to achieve reliable ultra-high resolution tomography results here!

Motion Scan and Data Collection Methods for Electro-Optic System Testing

April 10, 2024
Learn how different scanning patterns and approaches can be used in measuring an electro-optic sensor performance, by reading our whitepaper here!

How Precision Motion Systems are Shaping the Future of Semiconductor Manufacturing

March 28, 2024
This article highlights the pivotal role precision motion systems play in supporting the latest semiconductor manufacturing trends.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!