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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] 

FBS2 Top Hat beam shaper

FBS2 - Gaussian-to-TopHat beam shaper


TOPAG developed a new version of its FBS Top Hat beam shaper for diffraction limited spot size. The new FBS2 beam shaper features a Top Hat profile with improved square footprint and increased depth of focus. Within this range the Top Hat profile doesn’t change and shows nearly constant peak intensity. Therefore the new FBS2 beam shaper leads to a more stable process and improved the process quality.


Bezeichnungen der Tabs

  • Description
  • Specification
Tab 1
The FBS2 beam shaper can be combined with any objective or F-Theta lens. FBS2 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. FBS2 elements need to be matched to the laser wavelength (λ) and the (input) beam diameter (d).
Tab 2
Efficiency > 90% 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: FBS2-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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