f to 2f interferometry
Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
To summarize the work, I succeeded to build an f to 2f interferometer, which is able to handle carrier-envelope phase (CEP) drift measurements. It is operating with two nonlinear effects such as second harmonic generation (SHG), and white light generation. It can measure the change of the CEP from shot to shot, if the shortest integration time of the spectrograph is enough for the repetition rate of the laser system. For CEP stabilizing a high energy, low repetition rate, ultra-short laser system this device can do the required measurements. Even for electric-field-dependent experiments that usually need CEP stabilized laser system, this device helps to provide the measurement without stabilizing the laser system. This is because we can exactly tell the changes of electric field of the laser pulses that are dictating the light-material interaction in the given experiment. Another advantage of this device is that it has relatively small size and mass, so it’s easy to place into many parts of the laser or an experiment, so the electric-field dependence can be investigated easily in several positions. In the near future, when the whole LWS-20 laser system with the double OPCPA stages will be ready for experiments, such as high harmonic generation or electron acceleration, it will be CEP stabilized with the help of this device. At the end of the laser system the repetition rate of the high energy sub-5-fs pulses is 10 Hz, which with an evaluation program written in LabVIEW probably allows to observe the CEP drift in real time. This makes the required long adjusting time in CEP-dependent experiments faster and the accuracy of the measurement better, because the CEP is determined with high accuracy near the experiments.
Place, publisher, year, edition, pages
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-132379OAI: oai:DiVA.org:umu-132379DiVA: diva2:1080885
Subject / course
Fysik D - examensarbete II