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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

FBS Top Hat beam shaper

FBS - Gaussian-to-TopHat beam shaper


For many applications in laser material processing it is necessary to focus a Gaussian laser beam to the smallest possible spot size. In addition focused profiles often should be homogeneous. Therefore TOPAG developed the so called FBS beam shapers which create square Top Hat profiles with diffraction limited spot sizes. FBS stands for Focus-Beam-Shapers or Fundamental-Beam-mode-Shaping.


Bezeichnungen der Tabs

  • Description
  • Specification
Tab 1
The FBS beam shaper can be combined with any objective or F-Theta lens. FBS can be included at nearly any position into the beam path (even in front of or within a beam expander/telescope). The width of Top Hat in the focal plane will be 1.5 times larger than the diffraction limited Gaussian focus and is approximately given by 2*λ*f/d or λ/NA with the numerical aperture (NA) of the focused beam. FBS elements need to be matched to the laser wavelength (λ) and the (input) beam diameter (d).
Tab 2
Efficiency > 95% of input energy within Top Hat profile
Transmission > 99%, incl. AR/AR coating
Material UV Fused Silica
Dimensions dia. 25.4mm/thickness 3mm
Damage threshold 4J/cm² @ 532nm and 10ns
Select beam diameter d (@1/e2) 1.0, 1.5 … 10.0mm
Tolerance for input beam diameter < ±10%
Select wavelength/AR coating (standard) 1064/1030nm, 532/515nm, 355/343nm
Others sizes and wavelengths on request
Model No: FBS-beam diameter-wavelength

- Input beam should be single mode Gaussian beam (TEM00) with M² < 1.4.
- Free/clear aperture should be min. 2.2times larger than beam diameter (@1/e²) along total beam path

Recommended equipment: x-y-positioner for alignment of the beam shaper in x- and y-direction. Topag offers two different adjustment mounts, HSF01 and HSF02 (+ assembling of beam shaper and mount).

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