Stefanus Renaldi Wijaya

As a research assistant, the focus of this research is on the use of lithium-rich ceramic melts as potential tritium breeding materials for future fusion reactors. We aim to improve its performance as a fuel source, enabling fusion reactors to generate their own fuel on-site. My work involves both computational research, where I work with a team to develop the program to carry out experiments to test the behaviour of lithium-rich ceramic melts under different conditions.

Working in the field-resolved infrared spectroscopy (FIRS) group within Attosecond group, led by Dr. Alexander Weigel, my primary responsibility covers the dispersion characterisation of chirped mirrors within the infrared range. This involves White-Light Interferometry, wherein a broadband light source is utilised in a Michelson-Interferometer setup.

As a research intern in the cavity quantum optics group under Prof. David Hunger, my research focuses on the study of cavity enhanced fluorescence, cooperative emission, and optofluidic lasing. To investigate these phenomena, I perform spectroscopy and lifetime measurements on rare earth metal ions, with the goal of understanding their behavior as a potential gain medium for optofluidic laser systems.

Working in Prof. Michael Kues' group under the supervision of Dr. Surajit Bose, I researched the mechanism of a frequency shift in a single photon level using front-induced transition. During my research, I worked in a laser lab and also did some programming for the measurement using MATLAB. The research result is submitted as my bachelor thesis.

As a teaching assistant, my responsibilities include presenting exercises, tutoring students, and assisting in lesson preparation by creating problem sets, monitoring and marking exams. In addition, I also lead the tutorial team by training new tutors and developing the tutorial systems. My work as a teaching assistant includes a combination of both teaching and administrative duties, where I am responsible for the support and development of the students, as well as the tutorial team.

As a research intern in the gravitational wave group, I am working on a project to demonstrate quantum radiation pressure noise in the hundred-Hz band. My research involves simulating microresonator acoustic modes, thermal behavior, and quantum shot noise using Comsol and MATLAB.. My work is focused on understanding the fundamental physics of quantum radiation pressure noise and its impact on the sensitivity of gravitational wave detectors.