Tight focusing of radially polarized Gaussian and Bessel-Gauss beams

We examine the effects of tightly focusing a radially polarized beam with uniform, Gaussian, or Bessel-Gauss pupil functions. The resulting FWHM is smallest for the case of a uniform amplitude profile, while the Bessel-Gauss beam results in the largest FWHM. The uniform amplitude profile also result...

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Bibliographic Details
Published in:Optics letters 2007-12, Vol.32 (23), p.3417-3419
Main Authors: YEW, Elijah Y. S, SHEPPARD, Colin J. R
Format: Article
Language:English
Subjects:
Beam characteristics: profile, intensity, and power
spatial pattern formation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser optical systems: design and operation
Optics
Physics
Polarization
Wave optics
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Summary:We examine the effects of tightly focusing a radially polarized beam with uniform, Gaussian, or Bessel-Gauss pupil functions. The resulting FWHM is smallest for the case of a uniform amplitude profile, while the Bessel-Gauss beam results in the largest FWHM. The uniform amplitude profile also results in an axial field component that increases fastest with increasing NA. The ratio of the axial component to the transverse component is also the greatest for the uniform pupil function. On the other hand, the Bessel-Gauss beam benefits the most from the use of an annulus.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.32.003417