Abstract
Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well as a super-Gaussian beam with radial and circular polarization were investigated versus changes in the height of a diffractive axicon. The height of the relief of the optical element varied from 0.25λ to 3λ. The modeling by a finite-difference time-domain method showed that variations in the height of the diffractive axicon significantly affect the diffraction pattern in the near field of the axicon. The smallest focal spot size for a super-Gaussian beam was obtained for radial polarization at a height equal to two wavelengths. The minimum size of the focal spot for the Laguerre-superGauss mode (1,0) was obtained for circular "–" polarization with an element height equal to a quarter of the wavelength.
Highlights
Dynamic focal shift and extending depth of focus based on the masking of the illuminating beam and using an adjustable axicon / S.N
Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well as a superGaussian beam with radial and circular polarization were investigated versus changes in the height of a diffractive axicon
The modeling by a finite-difference time-domain method showed that variations in the height of the diffractive axicon significantly affect the diffraction pattern in the near field of the axicon
Summary
Минимальный размер фокального пятна для моды Лагерра–супергаусса (1,0) получен для круговой «–» поляризации при высоте элемента, равной четверти длины волны. Следует отметить случай круговой «–» поляризации для высоты рельефа аксикона h = 3λ: в непосредственной близости от элемента наблюдается резкое падение интенсивности на оптической оси с последующим восстановлением и формированием боковых «лепестков».
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