Jena scientists generate supercontinuum light source using liquid core optical fibers and reveal a new type of soliton dynamics
The researchers pumped a hybrid waveguide with an ultrafast, intense laser pulse and produced a very broad light spectrum in the near and mid-infrared range (1.1 μm to 2.7 μm) not visible to the human eye. Due to the unique characteristics of the liquid fiber core, the light pulse is broken up into solitons -- a multitude of light waves with different wavelengths.
The solitons form the extremely broadband laser light that is indispensable as a supercontinuum light source for applications in medical imaging, measurement technology, and spectroscopy. The team of research scientists from the Leibniz Institute of Photonic Technology (Leibniz IPHT) in Jena, the Fraunhofer Institute of Applied Optics and Precision Mechanics, the Friedrich Schiller University of Jena, and the Helmholtz Institute Jena published the results of their work in the renowned journal Nature Communications.
Carbondisulfide shows non-linear optical effects and high transmission
The coupled, ultrafast light pulse breaks up into solitons only due to non-linear interactions with matter in the optical fiber. In case of liquid core fibers, this means that the optical density of the liquid inside the core changes significantly with the intensity of the incident light. However, not many materials show nonlinear optical effects and, at the same time, exhibit sufficient light transmission in the infrared spectral range.
Mario Chemnitz, scientist at Leibniz IPHT and first author of the publication, explains the unusual effect as follows: "The fiber core is filled with carbon disulfide, a liquid chemical compound with a very high refractive index. If we now couple polarized light into the core, the carbon disulfide molecules orient themselves along the electromagnetic field of the light. Due to this molecular orientation, the optical density -- and thus the light propagation in the fiber -- depends on the intensity of the laser light."
Optical memory effect
One unique feature of carbon disulfide is that the molecules orient themselves with a certain time delay. If the incident laser light pulse is much shorter than the time that the molecules require for orientation in the optical field, the research scientists can observe a special, delayed dynamic of the resulting solitons.
This was predicted back in 2010, but it was only now, the Jena scientists were able to provide experimental proof and an exact theoretical description of the processes. Mario Chemnitz describes this phenomenon as an optical "memory effect" of the liquid. This unique characteristic of the liquid fiber cores reduces fluctuations in the spectral bandwidth of the supercontinuum light source and makes liquid core fibers a more stable alternative to the known broadband light sources based on optical fibers made from special glasses.
The original article with the title "Hybrid soliton dynamics in liquid-core fibres" by Mario Chemnitz, Martin Gebhardt, Christian Gaida, Fabian Stutzki, Jens Kobelke, Jens Limpert, Andreas Tünnermann, and Markus A. Schmidt was published in Nature Communications.
Anja Schulz | EurekAlert!
NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center
Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses