10 January 2018 Beam-width spreading of vortex beams in free space
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Abstract
Based on the extended Huygens-Fresnel principle and the definition of second-order moments of the Wigner distribution function, the analytical expression for the beam-width spreading of Gaussian Schell-model (GSM) vortex beams in free space are derived, and used to study the influence of beam parameters on the beam-width spreading of GSM vortex beams. With the increment of the propagation distance, the beam-width spreading of GSM vortex beams will increase; the bigger the topological charge, spatial correlation length, wavelength and waist width are, the smaller the beam-width spreading is.
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Weiwei Wang, Jinhong Li, Meiling Duan, "Beam-width spreading of vortex beams in free space", Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 106170J (10 January 2018); doi: 10.1117/12.2293222; https://doi.org/10.1117/12.2293222
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