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P RE S S RE LE AS E
LZH contributing to
research priority „Hybrid Numerical Optics”
The Laser Zentrum Hannover e.V. (LZH) is working on
three subprojects in the new research priority “Hybrid
Numerical Optics” of the Hannover Centre for Optical
Technologies (HOT) of the Gottfried Wilhelm Leibniz University Hannover. This priority is being supported by the funding initiative „Niedersächsisches Vorab“ with almost one
million Euros until the fall of 2018.
 Press release
Hannover, January, 28th, 2016
 Contact
Dr. Nadine Tinne
Marketing & Communications
+49 511 2788-238
[email protected]
In the new competence center for optical simulation, the LZH is
working on three subprojects in the areas of high-power glass
fiber amplifiers, dielectric coatings and light propagation in fluid
columns.
Highest laser powers
In the subproject „Dynamic light propagation in high output glass
fiber amplifiers“, the scientists will be working on increasing the
laser power of continuous and pulsed systems for the next three
years. Presently, the maximum usable output power of high
power fiber systems is limited by the so-called transverse mode
instability (TMI). Here, the laser beam profile begins to fluctuate
above a certain output threshold. With a simulation model, the
Laser Development Department at the LZH wants to more closely examine the interactions and processes in the fiber amplifier,
and thus better understand TMI. Furthermore, they plan to examine another peak power dependent phenomenon, the effects of
Kerr nonlinearity on the pulse propagation in fused fiber couplers.
Improving coatings
In the subproject „Structural and optical properties of dielectric
coatings“, the Laser Components Department is combining different simulation techniques in order to optimize coating processes. The scientists want to understand how the coating properties and damage behavior is influenced by the coating parameEditing:
Dr. Nadine Tinne | Marketing & Communications | +49 511 2788-238 | [email protected]
Laser Zentrum Hannover e.V. | Hollerithallee 8 | 30419 Hannover | +49 511 2788-0 | www.lzh.de
ters. For this purpose, they are combining classical growth models with quantum-mechanical simulation techniques. Thus, they
can determine the structural, optical and electronic properties of
the coating structures produced.
Liquid-guided laser beam
In the subproject „Simulation of the light-guiding properties in
coaxially flowing fluid pairs using wave-optical light propagation
in fluid-dynamically and thermally superimposed refractive index
distributions”, the beam guidance in flowing liquids will be simulated. The scientists in the Production and Systems Department
want to predict light propagation in fluid or gaseous light waveguides using a hybrid approach. In order to do so, they will simulate a flowing liquid column using a two-fluid system. They will
also investigate the propagation of light in this liquid column.
Connecting both methods is the main goal of this subproject. A
liquid-guided laser beam can be used, for example, for laser materials processing.
This press release has two figures.
Figure caption 1: Comparison of an amorphous and a crystalline titanium oxide structure. (Illustration: LZH)
Editing:
Dr. Nadine Tinne | Marketing & Communications | +49 511 2788-238 | [email protected]
Laser Zentrum Hannover e.V. | Hollerithallee 8 | 30419 Hannover | +49 511 2788-0 | www.lzh.de
Figure caption 2: A laser beam (green) will be coupled into a liquid column with a core fluid (red) and a jacket fluid
(blue). (Illustration: LZH)
Laser Zentrum Hannover e.V. (LZH)
As an independent, non-profit research institute, the Laser Zentrum Hannover e.V. (LZH) stands for innovative
research, development and consulting. The LZH is supported by the Lower Saxony Ministry for Economics, Labour and Transport and is dedicated to the selfless promotion of applied research in the field of photonics and
laser technology. Founded in 1986, over 170 employees are now working for the LZH.
The focus of the LZH lies on the fields of optical components and systems, optical production technologies, and
biomedical photonics. Interdisciplinary cooperation between natural scientists and mechanical engineers makes
innovative approaches to challenges from the most different areas possible: from the development of components
for specific laser systems to process developments for the most diverse laser applications, for example for medical technology or lightweight construction in the automotive sector. Seventeen spin off companies have emerged
from the LZH up to now. Thus, the LZH has created a strong transfer between fundamental science, application
oriented research, and industry.
Editing:
Dr. Nadine Tinne | Marketing & Communications | +49 511 2788-238 | [email protected]
Laser Zentrum Hannover e.V. | Hollerithallee 8 | 30419 Hannover | +49 511 2788-0 | www.lzh.de