Beam quality of radial Gaussian Schell-model array beams |
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Authors: | Xiaoqing Li Fan Yang |
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Affiliation: | Department of Physics, Sichuan Normal University, Chengdu 610068, China |
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Abstract: | Taking the Rayleigh range zR and the M2-factor as the characteristic parameters of beam quality, the beam quality of radial Gaussian Schell-model (GSM) array beams is studied. The analytical expressions for the zR and the M2-factor of radial GSM array beams are derived. It is shown that for the superposition of the cross-spectral density function zR is longer and the M2-factor is lower than that for the superposition of the intensity. For the two types of superposition, zR increases and the M2-factor decreases with increase in beam coherence parameter, and both zR and the M2-factor increase with increase in inverse radial fill-factor. For the superposition of the cross-spectral density function, zR increases and the M2-factor decreases with increase in beam number, while for the superposition of the intensity both the zR and M2-factor are independent of the beam number. |
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Keywords: | Radial Gaussian Schell-model (GSM) array beam Rayleigh range M2-factor |
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