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Identifier

000418777

Title

Parity- Time (PT) symmetry in coupled laser cavities

Alternative Title

Χωροχρονική συμμετρία σε συζευγμένες κοιλότητες λέιζερ

Author

Χουλάκης, Ανδρέας Μ.

Thesis advisor

Μακρής, Κωνσταντίνος

Abstract

In the context of non-Hermitian Photonics, we examine the effect of coupling to loss in multimode lasing systems. More specifically, we consider one-dimensional coupled ring and ridge cavities. Both cavities are intrinsically lossy and because of the partial pumping scheme the whole system's behavior resembles that of parity-time (PT)-symmetric systems. The nonlinear time dynamics is based on a modal expansion method (using as bi-orthogonal basis the constant-flux states) of Maxwell-Bloch semiclassical laser equations. A direct outcome of the underlying PT-symmetric behavior of the system is the suppression of higher order lasing modes. In particular, the coupled cavities operate in the single lasing regime for a considerable range of values of the pump, before the higher order modes start to lase. We investigate this range of pump values for two coupled ridge cavities for various design parameters. Two-mode, four and six mode lasing are computationally studied.

Language

English

Subject

Maxwell-Bloch equations

Multimode laser

Semiclassical laser theory

Ημικλασική θεωρία λέιζερ

Ρυθμοί ταλάντωσης

Issue date

2018-11-23

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses