Open AccessCoherence vortices in partially coherent beams consisting of a superposition of Laguerre-Gaussian modes
Author(s) -
Pusheng Liu,
Lyu Bai-Da
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.2623
Subject(s) - superposition principle , coherence (philosophical gambling strategy) , laguerre polynomials , physics , vortex , gaussian , coherence length , optics , coherence theory , quantum mechanics , mechanics , superconductivity
The coherence vortices in a new class of partially coherent beams with separable phase recently proposed by Bogatyryova et al. are studied in detail. The new beams are generated by taking an incoherent superposition of Laguerre-Gaussian (LG) modes with equal azimuthal index. It is shown that the mode indices and weight factors of superposed LG modes, as well as the reference choice, affect the position where the circular edge dislocation takes place, and result in the vortex disappearance or the appearance of more than one coherence vortices. Furthermore, there also exist coherence vortices in partially coherent beams with non-separable phase consisting of an incoherent superposition of LG modes.