Super cosh-Gauss nonuniformly correlated radially polarized beam and its propagation characteristics

Author:

Zhu Xinlei,Yu Jiayi1,Wang Fei,Chen YahongORCID,Cai Yangjian1

Affiliation:

1. Shandong Normal University

Abstract

In this paper, a new kind of partially coherent vector beam termed as super cosh-Gauss nonuniformly correlated radially polarized (SCNRP) beam is introduced. Such beam source exhibits almost perfect coherence between two points that are within the beam center region or located on a ring concentric with the beam center. However, the coherence drops or even vanishes when the two points leave the central region and are located on the concentric rings with different radii. The second-order statistical properties, such as the spectral density, the state of polarization (SOP), and the degree of polarization (DOP) of such beam upon free-space propagation are studied through numerical examples. Our results reveal that the beam displays a self-focusing property during propagation. The focusing ability can be enhanced with increasing the beam index and decreasing the beam’s spatial coherence width, whereas the DOP and SOP remain unchanged on propagation. Meanwhile, we establish an experimental system with the use of a radial polarization converter and a digital micro-mirror device to synthesize the SCNRP beam with controllable beam index and spatial coherence width. The spectral density and polarization properties of the synthesized beam during propagation are measured and analyzed in the experiment. The experimental results agree well with our theoretical predictions.

Funder

National Key Research and Development. Project of China

National Natural Science Foundation of China

the Innovation Group of Jinan

the Local Science and Technology Development Project of the Central Government

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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