Subterahertz refractive flat-top beam shaping via 3D printed aspheric lens combination

The viability of 3D printed aspheric lenses for the purpose of frequency-scalable subterahertz Gaussian to flat-top beam shaping is evaluated. A cylindrical one-dimensional Fresnel–Kirchhoff diffraction equation was implemented in Matlab and used to design a pair of aspheric lenses with customized v...

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Bibliographic Details
Published in:Applied optics (2004) 2020-06, Vol.59 (18), p.5429
Main Authors: Price, Brad D., Lowry, Seth N., Hartley, Ian D., Reid, Matt
Format: Article
Language:English
Subjects:
ABS resins
Acrylonitrile butadiene styrene
Continuous radiation
Gaussian beams (optics)
Lenses
Radius of curvature
Substrates
Three dimensional printing
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Summary:The viability of 3D printed aspheric lenses for the purpose of frequency-scalable subterahertz Gaussian to flat-top beam shaping is evaluated. A cylindrical one-dimensional Fresnel–Kirchhoff diffraction equation was implemented in Matlab and used to design a pair of aspheric lenses with customized vertex radius of curvature and conic constant. The lenses were printed at maximum possible resolution in acrylonitrile butadiene styrene ( n = 1.6 ) and tested with a 102 GHz continuous-wave subterahertz source. The aspheric lens combination produced a flat-top profile from a low-quality incident Gaussian beam at the minimal cost of 3D printing substrate. The flat-top profile exhibited small ( < 14 % root-mean-square deviation over a flat region) intensity fluctuations and is expected to prove useful in future terahertz applications that require a high degree of beam uniformity.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.393857