The influence of whispering gallery modes on the far field of ring lasers.

作者信息

Szedlak Rolf, Holzbauer Martin, MacFarland Donald, Zederbauer Tobias, Detz Hermann, Andrews Aaron Maxwell, Schwarzer Clemens, Schrenk Werner, Strasser Gottfried

机构信息

Institute of Solid State Electronics, TU Wien, Floragasse 7, 1040 Vienna, Austria.

Center for Micro- and Nanostructures, TU Wien, Floragasse 7, 1040 Vienna, Austria.

出版信息

Sci Rep. 2015 Nov 17;5:16668. doi: 10.1038/srep16668.

DOI:10.1038/srep16668

PMID:26573341

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4647838/

Abstract

We introduce ring lasers with continuous π-phase shifts in the second order distributed feedback grating. This configuration facilitates insights into the nature of the modal outcoupling in an optical cavity. The grating exploits the asymmetry of whispering gallery modes and induces a rotation of the far field pattern. We find that this rotation can be connected to the location of the mode relative to the grating. Furthermore, the direction of rotation depends on the radial order of the whispering gallery mode. This enables a distinct identification and characterization of the mode by simple analysis of the emission beam.

摘要