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Topic

Flattop

About: Flattop is a research topic. Over the lifetime, 423 publications have been published within this topic receiving 3984 citations. The topic is also known as: flat top & flat-top.


Papers
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Journal ArticleDOI
TL;DR: A focus shaping technique using generalized cylindrical vector beams that can be tailored by appropriately adjusting the rotation angle to obtain peak-centered, donut and flattop focal shapes is reported.
Abstract: We report a focus shaping technique using generalized cylindrical vector beams. A generalized cylindrical vector beam can be decomposed into radially polarized and azimuthally polarized components. Such a generalized cylindrical beam can be generated from a radially polarized or an azimuthally polarized light using a two-half-wave-plate polarization rotator. The intensity pattern at the focus can be tailored by appropriately adjusting the rotation angle. Peak-centered, donut and flattop focal shapes can be obtained using this technique.

572 citations

Journal ArticleDOI
TL;DR: A system of two aspheric lenses is described, which efficiently converts a collimated Gaussian beam to a flattop beam, and the performance of the as-built optics is compared quantitatively with the theoretical design.
Abstract: A system of two aspheric lenses is described, which efficiently converts a collimated Gaussian beam to a flattop beam. Departing from earlier designs, both aspheric surfaces were convex, simplifying their fabrication; the output beam was designed with a continuous roll-off, allowing control of the far-field diffraction pattern; and diffraction from the entrance and exit apertures was held to a negligible level. The design principles are discussed in detail, and the performance of the as-built optics is compared quantitatively with the theoretical design. Approximately 78% of the incident power is enclosed in a region with 5% rms power variation. The 8-mm-diameter beam propagates approximately 0.5 m without significant change in the intensity profile; when the beam is expanded to 32 mm in diameter, this range increases to several meters.

388 citations

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional focus shaping technique using the combination of cylindrical polarization with binary diffractive optical element is proposed, where the energy density pattern at the vicinity of the focus can be tailored in three dimensions by appropriately adjusting the parameters of the cylinrical vector beam illumination, numerical aperture of the objective lens and the design of the binary diffraction optical element.

137 citations

Journal ArticleDOI
TL;DR: A new CO(2) laser beam profile shaper was designed and tested, with high-power efficiency, that transforms a fundamental mode laserbeam profile into a flattop profile at a focal plane.
Abstract: A new CO2 laser beam profile shaper was designed and tested. With high-power efficiency, it transforms a fundamental mode laser beam profile into a flattop profile at a focal plane. The shaper uses an interlaced binary diffraction grating that modulates the E field both in phase and amplitude and generates an apodized and clipped sinc(x) distribution in the object plane.

121 citations

Journal ArticleDOI
TL;DR: In this paper, a single photonic crystal slab can function either as optical all-pass transmission or flattop reflection filter for normally incident light, and both filter functions are synthesized by designing the spectral properties of guided resonance in the slab.
Abstract: We show that a single photonic crystal slab can function either as optical all-pass transmission or flattop reflection filter for normally incident light. Both filter functions are synthesized by designing the spectral properties of guided resonance in the slab. The structure is extremely compact along the vertical direction. We expect this device to be useful for optical communication systems.

114 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202121
20208
201928
201825
201724
201629