BSc and MSc theses in the project “High-QG”

Ausschreibungsnummer:

Stellenangebot vom 9. Februar 2021

For our project High-QG we are looking for Master and Bachelor students who would like to do experimental projects for their thesis.

Gravitational-wave detectors on Earth use the most precise interferometers in existence today. The merger of two compact objects, such as black holes and neutron stars, generates gravitational waves that distort space-time. The more precise the detectors can measure, the better we can infer from the gravitational wave measurement their parameters, such as mass, distance, and spin.

To achieve the precision required for gravitational-wave measurements, the interferometer mirrors are isolated from seismic ground motion by active and passive filter stages. In the High-QG project, we are using recent developments in glass printing to build opto-mechanical interferometers that measure this seismic motion. As the seismic sensor itself becomes more precise, the measurement technology becomes more complex, which is why we are also working on optical frequency references and quasi-monolithic fiber collimators.

To learn more about precision metrology with interferometers, check out our recent topics:

Bachelor Thesis: “Measuring mechanical loss with interferometry”

We are using the latest developments in glass printing and bonding, and we need to know how these affect the mechanical loss in the material. Interferometers are the best tool to measure the behavior of our opto-mechanical devices. You will build an interferometer to measure the decay time of mechanical resonances and analyze their behavior. With your results, we will determine how we will build our motion sensors. After your analysis, we can then start assembling them.

Bachelor Thesis: “Highly reflective nano-structures”

Interferometers can be so precise that they measure the Brownian motion of the mirror surfaces. In gravitational-wave detectors, this is an unwanted source of noise. It is therefore very important to find better methods to create a highly reflective surface. Together with the Fraunhofer IOF we are working on resonant wave guide coatings. The IOF is currently producing samples with various parameters and materials. With our precision interferometry, we can measure quantities such as the reflectivity. You will set up an optical resonator to measure the reflectivity and profile of these samples and analyze the behavior. These results will help to understand the behavior of resonant wave-guide coatings and how we can find a configuration that will potentially be used in gravitational wave detectors.

Master Thesis: “Develop and analyze monolithic fiber collimators”

Your Master thesis will be a continuation of a current project. We have a couple of monolithic fiber collimators that are required for our High-QG project. This is a great position to continue this successful work as you can use the first results from pointing and beam shape measurements. You will further analyze this data and investigate mechanisms leading to deformations of the beam profile. Furthermore, you get the chance to design a new fiber collimator or manufacturing processes that will reduce beam deformations. During your thesis you will be working with optics, electronics, data acquisition, as well as hands on fiber processing. Your work will help us to build an integral part of the seismic isolation chain in gravitational-wave detectors.

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