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OPA setup

 

We offer Bachelor theses for the studies of Electrical Engineering and Physics of TU Vienna, as well as Project Works and Master or PhD/Doctoral theses as part of our research projects.

 

PhD/Doctoral theses

 

If you are interested in joining our team for a PhD/Doctoral work please contact Andrius Baltuska or Markus Kitzler.

 

Bachelor theses

 

We offer Bachelor theses in 3 different optics and laser related subjects. If you are interested, please contact the person(s) indicated below.

 


Topic Contact Person
1 Laser Engineering Audrius Pugzlys
2 Optical Metrology Markus Kitzler, Audrius Pugzlys
3 Optical methods in Material Science Markus Kitzler

 

Details with regards to content of a Bachelor theses can be adapted to your interests. Currently offered theses can be found in the TISS system of TU Vienna (Login required).

For all offered Bachelor theses the regulations of the Faculty of Electrical Engineering and Information Technology apply.

 

 

Master theses

 

The table below shows examples of possible Master thesis topics. Details with regards to content can be adapted to your interests.


Title Description Contact
1

Untersuchung und Kontrolle elektronischer Prozesse in Molekülen mittels ultrakurzer Laserpulse

Elektronische Prozesse in Molekülen finden auf einer Zeitskala von wenigen Femtosekunden (1fs=10-15s) oder sogar Attosekunden (1as=10-18s) statt. Unter Verwendung sehr kurzer und intensiver Laserpulse können diese Prozesse gezielt in Gang gesetzt werden, bspw. durch Ionisation des Moleküls, also durch Herausnehmen eines oder mehrerer Valenzelektronen. Solch Störungen der Elektronenwolke ziehen im Allgemeinen eine komplexe Restrukturierungsdynamik der Atome des Moleküls und eventuell einen Bruch einer bestimmten Molekülbindung nach sich. Bindungsbrüche sind die Voraussetzung für viele chemische oder biologische Prozesse.

Im Rahmen dieser Diplomarbeit soll, unter intensiver persönlicher Betreuung, in einem ersten Schritt untersucht werden, ob es möglich ist, den Laser-Ionisationsprozess so zu gestalten, dass ein oder mehrere bestimmte Valenzelektronen aus dem Molekül gerissen werden. Dazu sollen Kohlenwasserstoffmoleküle im Vakuum mit einem Laserpuls ausgerichtet und mit einem speziell geformten nachfolgenden Laserpuls ionisiert werden. In einem zweiten Schritt soll dann untersucht werden, ob sich durch diese gezielte Ionisation der Fragmentierungsprozess des Moleküls kontrollieren lässt.

Markus Kitzler
2

Spektroskopie von kohärentem XUV-Licht, erzeugt mit kontrollierten infraroten Wellenformen

Intensive Femtosekunden-Laserpulse können in einem Gas die Emission von laser-artiger XUV Strahlung hervorrufen. Die Physik dahinter könnte man "extrem nicht-lineare Optik" nennen, meistens spricht man aber von Starkfeldphysik: es ist das elektrische Feld des Laserpulses anstatt nur die Intensität (Quadrat des Feldes), das die Wechselwirkung antreibt. Wir suchen motivierte Masterstudenten, die mitarbeiten wollen wenn wir infratrote Femtosekunden-Laserpulse mit nicht-sinusoidaler Wellenform herstellen und sie dann benutzen, um die Erzeugung von XUV-Strahlung in einem Gas direkt über die antreibende Wellenform zu kontrollieren. Die Laserpulse werden in einem optisch-parametrischen Verstärker mit angeschlossenem Interferometer erzeugt. Erzeugung und Detektion des XUV Lichtes findet unter Vakuum statt, und das verwendete XUV-Spektrometer ist eine Neubau, der ausgiebig getestet und charakterisiert werden muss. Andrius Baltuska
4

Construction and characterization of the frontend for mid-IR optical parametric amplifier

Recent developments in the strong field physics demand powerful mid-IR sources of ultrashort pulses. One of the techniques used for the generation of multi-millijoule femtosecond pulses in the mid-IR spectral region is an optical parametric (chirped pulse) amplification (OP(CP)A). The OP(CP)A relays on the generation of a weak broadband seed which subsequently is amplified in a parametric power amplifier pumped by a powerful pulsed laser. One of the major obstacles of this technique is a synchronization of the seed and pump pulses, which might be realized in both active and passive way. Recently in our laboratory we have developed a prototype of multistage mid-IR OPA generating ultra-broad femtosecond pulses in the mid-IR spectral range. The frontend of the OPA system was 5‑mJ, 200‑fs, 1030‑nm Yb:CaF2 laser, which was used to generate both seed and pump pulses. However the laser system is rather complicated and expensive and we believe that the frontend can be realized by using much cheaper, simple and reliable µJ-level Yb fiber laser amplifier. The amplifier will be used to generate both seed for the pump laser system operating at around 2µm and seed for the OP(CP)A tunable between 2.7 and 4 µm, which will assure passive optical synchronization. The above mentioned seed pulses can be generated by parametric amplification of the white light (WL) generated in a photonic crystal fiber (PCF) or in transparent solids, as well as by difference frequency generation (DFG) in periodically poled (PP) nonlinear optical (NLO) crystals. The project will consist of the following tasks: i) generation and characterization of WL; ii) generation and characterization of DFG in PP NLO crystal; iii) amplification of generated WL in an OPA; iv) characterization of the performance of the OPA. Audrius Pugzlys
5

Electron dynamics of hydrocarbon molecules in strong laser field

Investigating electron dynamics of atoms and molecules is one of the key tasks for attosecond physics. Electron dynamics plays a central role in strong field phenomena. In this work, with the COLTRIMS technique, electron dynamics, such as multiple molecular orbital effect, effect of electron-electron correlation and electron-nucleus dynamics, during ionization and dissociation of hydrocarbons in a strong laser field will be studied. The tasks can be numerical simulations, data analysis from measured data or performing experiments. Markus Kitzler
6 Investigation of ionization and fragmentation of aligned molecules

Molecules subject to strong laser pulses may become ionized through strong-field ionization. After the removal of electrons not only the charge density will redistribute very quickly within the molecule, also the molecule itself may undergo partly severe structural deformation. Eventually, the multiply charged complex may break into two or several charged fragments that are driven apart by Coulomb repulsion.

This work shall investigate the dependence of ionization and fragmentation of polyatomic molecules on the relative alignment of the molecular axis to the laser polarization direction and on the laser-pulse parameters duration and intensity, as well as the field-shape of single-cycle pulses characterized by the carrier-envelope phase. Alignment shall be achieved by a preceding laser pulse. The molecular ionic fragments will be recorded by coincidence momentum imaging.
Markus Kitzler
7

Ultrabroadband mid-IR pulse characterization: methods and materials

The mid-infrared (mid-IR, 3-10 μm) spectral region is of great interest for ultrafast spectroscopic studies and high-field physics applications. During the work student will overview different techniques of optical pulse characterization providing information about the electrical field envelope and phase of mid-IR pulses. In order to prove applicability of certain characterization methods and nonlinear optical materials, simulations of response of different techniques for given input parameters will be done. For the “excellent” grade, the student is expected to do experimental characterization of ultrashort mid-IR pulses. Audrius Pugzlys