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2 Optica Applicata

2 2019

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Experimental study of an anomalous hollow beam with orbital angular momentum

Lu Xingyuan, Zhao Chengliang, Hoenders Bernhard J., Yang Yuanjie, Cai Yangjian

Optica Applicata

2019

Vol. 49, nr 2

217--226

Anomalous hollow beam has potential applications in the optical trapping and free space optical communications, etc. It is noted that, thus far, although a large number of studies have been carried out in this field, most of them are theoretical studies and only quite a few cases have experimental results. Here, we experimentally study the generating of anomalous hollow beam carrying orbital angular momentum, and measure its topological charge. We show that the number of dark rings in the Fourier transform of intensity patterns is equal to the topological charge. The experimental results agree well with the simulations.

Average intensity of a partially coherent anomalous hollow beam propagating in underwater oceanic turbulence

Liu Dajun, Wang Guiqiu, Zhong Haiyang, Yin Hongming, Wang Yaochuan

Optica Applicata

2019

Vol. 49, nr 2

227--239

Based on the extended Huygens–Fresnel principle, the cross-spectral density function of a partially coherent anomalous hollow beam (AHB) propagating in underwater oceanic turbulence has been derived. The average intensity of partially coherent AHB propagating in underwater oceanic turbulence has been calculated. The influences of coherence length and the strength of underwater oceanic turbulence on the spreading properties of partially coherent AHB are illustrated and analyzed using numerical examples. It is found that the partially coherent AHB with smaller coherence length and the partially coherent AHB propagating in stronger underwater oceanic turbulence will lose the initial beam profile and evolve into the Gaussian beam faster. The results are useful in applications for underwater wireless optical communication.