Design and Analysis of Flat-Top Beam Produced by Diffractive Optical Element

Nie, Shuzhen; Yu, Jin; Liu, Yan; Zhang, Fan

doi:10.4028/www.scientific.net/amm.743.800

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…∆y 2 fitted = 0.00123∆x − 1.64064= 0.00123 × (±0.1) − 1.64064 ≈ −1.64 (mm) (15) Based on the above analysis, displacement distance of cylindrical lens 3 is 0.5 mm, and the displacement error is less than ±0.0014 mm. The displacement distance of cylindrical lens 4 is 12.91 mm, and the displacement error is less than ±1.64 mm.…”

Section: Study On the Zoom Function Of The Lens Systemmentioning

confidence: 75%

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Flat-Top Line-Shaped Beam Shaping and System Design

Guo

2022

Sensors

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In this study, the circular Gaussian spot emitted by a laser light source is shaped into a rectangular flat-top beam to improve the scanning efficiency of a selective laser sintering scanning system. A CO2 laser with a power of 200 W, wavelength of 10.6 μm, and spot diameter of 9 mm is shaped into a flat-top spot with a length and width of 0.5 × 0.1 mm, and the mapping function and flat-top Lorentzian function are calculated. We utilize ZEMAX to optimize the aspherical cylindrical lens of the shaping system and the cylindrical lens of the focusing system. We then calculate the energy uniformity of the flat-top line-shaped beam at distances from 500 to 535 mm and study the zoom displacement of the focusing lens system. The results indicated that the energy uniformity of the flat-top beam was greater than 80% at the distances considered, and the focusing system must precisely control the displacement of the cylindrical lens in the Y-direction to achieve precise zooming.

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Section: Study On the Zoom Function Of The Lens Systemmentioning

confidence: 75%

“…Additionally, only two aspherical cylindrical lenses are typically required to realize laser-beam expansion and shaping, and many previous studies have extensively investigated these applications. A Gaussian beam can effectively be shaped into a flat-top beam [13][14][15][16]; however, the shape of the beam spot cannot be changed.…”

Section: Introductionmentioning

confidence: 99%

Flat-Top Line-Shaped Beam Shaping and System Design

Guo

2022

Sensors

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“…Chen et al [20] have investigated flat-top focusing under radial polarization illumination. Nie et al [21] have studied the flattopped beam generated by diffractive optical elements. Chandrasekaram et al [22] have analyzed the propagation properties of a cylindrically polarized annular multi-Gaussian beam.…”

Section: Introductionmentioning

confidence: 99%

Focus shaping of cylindrically polarized higher-order Generalized Spiraling Bessel beams

Halba

Hricha

Belafhal

2023

Preprint

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In this paper, the focusing properties of the cylindrically polarized higher-order Generalized Spiraling Bessel beams (GSBB) by a high numerical aperture (NA) lens system are investigated based on the Richards and Wolf vectorial diffraction method. Intensity distribution of the cylindrically polarized higher-order GSBB at the focal region is derived and analyzed with numerical examples. It is shown that tailored focal patterns with a multi-ringed dark hollow profile and a flat-top profile can be achieved. The central dark region's width, the multi-ringed structure, and the peak intensity and width of the flat-topped profile can be controlled by adjusting properly the polarization rotation angle, the topological charge, the axicon base angle, and the order of the beam. The focusing properties of the beam may find applications in laser scanning microscopy, optical micro-particle trapping, and optical data storage.

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“…With the continuous expansion of laser application, different application objects often put forward different requirements for laser intensity distribution, such as [1][2][3][4][5], linear beam in laser scanning, flattop beam in laser machining, spots array in laser surface treatment, etc. Due to the limitation of Gaussian intensity distribution of traditional laser beam, it is necessary to use shaping technology to convert it into a shaped one with certain spatial intensity distribution [6].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a spatially shaped laser beam used for temperature field simulation

Nie

Zhao

Xiao

et al. 2020

Preprint

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Laser has controllable space-time characteristics and can be loaded on materials as a heat source in laser manufacturing, laser medical and other fields. In the thermal fatigue test of engine parts, thermal load can also be considered by laser beam. In this paper, a large aperture spatially shaped laser beam with complex and uneven intensity distribution is selected as the heat source for temperature field simulation. Using the method of key nodes selection, the temperature distribution of a few key nodes can reflect the desired temperature field of the whole nodes. Based on finite element model (FEM), through the numerical simulation of the temperature field, optimized intensity distribution of the shaped laser beam is calculated, and a diffractive optics element (DOE) is designed to achieve the shaping effect. The results show that a spatially shaped laser beam can be used for temperature field simulation.

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Design and Analysis of Flat-Top Beam Produced by Diffractive Optical Element

Cited by 9 publications

References 9 publications

Flat-Top Line-Shaped Beam Shaping and System Design

Flat-Top Line-Shaped Beam Shaping and System Design

Focus shaping of cylindrically polarized higher-order Generalized Spiraling Bessel beams

Design and analysis of a spatially shaped laser beam used for temperature field simulation

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