Generation of a high-quality partially coherent dark hollow beam with a multimode fiber

Opt Lett. 2008 Jun 15;33(12):1389-91. doi: 10.1364/ol.33.001389.

Abstract

We report the experimental generation of a high-quality partially coherent dark hollow beam (DHB) by coupling a partially coherent beam into a multimode fiber (MMF) with a suitable incidence angle. The interference experiment of the generated partially coherent DHB passing through double slits is demonstrated. It is found that the coupling efficiency of the MMF, the quality, and the coherence of the generated partially coherent DHB are closely controlled by the coherence of the input beam.