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 published on a yearly basis
Papers
IBM1
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.
448 citations
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.
157 citations
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.
133 citations
TL;DR: The beam shaper the authors developed shapes the transmit beam of a CO(2) laser radar that uses a linear detector array and produces a stretched profile that efficiently and uniformly illuminates the far-field footprint of the detector array.
Abstract: The beam shaper we developed shapes the transmit beam of a CO(2) laser radar that uses a linear detector array. It consists of a diffraction grating and an anamorphic prism beam compressor and produces a stretched profile that efficiently and uniformly illuminates the far-field footprint of the detector array. The diffraction grating phase modulates the near field or the laser beam to generate a far-field flattop intensity profile, whereas the compressor produces the necessary profile eccentricity. We have achieved conversion efficiencies in the 70-90% range.
95 citations
TL;DR: A simple single-zone binary optic was developed to modify the beam profile from Gaussian to flattop and verified a large increase in the laser energy process window because of the shaped beam profile.
Abstract: Laser repair of dynamic random-access memories is commercially significant at the 1-Mbit density and larger. The window of acceptable laser parameters required to repair these parts typically decreases with each successive device generation because of increased variations in oxide thickness. A simple single-zone binary optic was developed to modify the beam profile from Gaussian to flattop. Experiments performed on actual dynamic random-access memory parts verified a large increase in the laser energy process window because of the shaped beam profile.
82 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 21 |
| 2020 | 8 |
| 2019 | 28 |
| 2018 | 25 |
| 2017 | 24 |
| 2016 | 29 |