Tight focus of a radially polarized and amplitude- modulated annular multi-Gaussian beam |
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| Authors: | Chen Jian-Nong Xu Qin-Feng Wang Gang |
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| Affiliation: | School of Physics, Ludong University, Yantai 264025, China; School of Electrical and Electronic Engineering, Ludong University, Yantai 264025, China |
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| Abstract: | The focusing of a radially polarized beam without annular apodization ora phase filter at the entrance pupil of the objective results in a wide focus and low purity of the longitudinally polarized component. However, the presence of a physical annular apodization or phase filter makes some applications more difficult or even impossible. We propose a radially polarized and amplitude-modulated annular multi-Gaussian beam mode. Numerical simulation shows that it can be focused into a sharper focal spot of 0.125λ2 without additional apodizations or filters. The beam quality describing the purity of longitudinally polarized component is up to 86%. |
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| Keywords: | focusing polarization laser beam |
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