Title: Phonon laser linewidth near an exceptional point
Other Titles: Linienbreite eines Phononen-Lasers in der Nähe eines Ausnahmepunkts
Language: English
Authors: Pichler, Kevin Andreas 
Qualification level: Diploma
Advisor: Rotter, Stefan  
Assisting Advisor: Krimer, Dmitry 
Issue Date: 2016
Number of Pages: 55
Qualification level: Diploma
The invention of the laser was certainly one of the most important technological developments of the 20th century. Countless laser applications in our daily life prove the significance of the process of stimulated emission of photons. Besides photons, however, also phonons can be amplified by stimulated emission. This gives rise to the concept of a phonon laser, which represents the sonic equivalent to an optical laser. In recent years, phonon lasers could even be realized experimentally. While optical lasers have been used and studied for more than five decades, the theory of phonon lasers is much less developed. One of the missing links, for example, is a complete phonon laser linewidth theory. This thesis deals with the dependence of the phonon laser characteristics on various system and operating parameters. In particular, the behavior of the linewidth in the vicinity of an exceptional point is examined. Exceptional points occur when the eigenvalues and the corresponding eigenstates of a system coalesce. As we show on a theoretical level, such a non-Hermitian degeneracy results in nontrivial broadening of the phonon laser linewidth - a quantity that should also be accessible in the experiment.
Keywords: Phononenlaser; Linienbreite
Phonon laser; Line width
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-7792
Library ID: AC13357597
Organisation: E136 - Institut für Theoretische Physik 
Publication Type: Thesis
Appears in Collections:Thesis

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