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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] 


GTH-5-250-4 - Gaussian-to-Top Hat beam shaping lens

GTH-5-250-4 neueHomepage

GTH beam shapers have a free-form surface which redistributes a Gaussian beam (TEM00) into a square Top Hat. GTH-5-250-4 operates within a wavelength range from VIS to NIR. It includes a focal length of 250mm an generates a 4 x 4mm² Top Hat in 250mm distance. Using additional lenses it is possible to scale the Top Hat size. The combination with cylindrical optics also allows generating of homogeneous line profiles.


Bezeichnungen der Tabs

  • Description
  • Specification
  • Top Hat sizes/Pictures
Tab 1

The GTH-5-250/4 delivers a 4 x 4mm Top Hat in 250mm distance and requires a 5.0mm (@1/e²) input beam diameter. The scaling of Top Hat sizes from 500µm up to tens of millimeters is possible by using additional lenses with positive or negative focal lengths.

Topag offers GTH beam shapers with the following standard AR/AR coatings: Single line AR/AR coatings @ 1064nm, 1030nm, 532nm or 515nm, or broad band AR/AR coatings @ VIS (400-700nm) or IR (700-1300nm). Other AR/AR coatings on request.


Tab 2

Input beam TEM00, Ø 5.0mm ±0.15mm (@1/e²)
Working distance 250mm (adjustable with additional lens)
Top Hat size @ 250mm working distance 4 x 4mm² (adjustable)
Necessary free aperture always 2.2x beam diameter (@1/e²), along total beam path
Efficiency > 95% of input energy within Top Hat profile
Homogenity ±5% (rel. to average intensity within Top Hat)
Damage threshhold 3J/cm² @532nm, 10ns
Material LF5
Recommended wavelength range 400…1550nm
Dimensions Ø (12.0 -0.1)mm, thickness (4.0 ±0.1)mm
Standard AR/AR coatings 1064/1030nm, 532/515nm, VIS (400-700nm) or IR (700-1300nm), others on request
Beam shaper is mounted in ring holder, Ø 25.4mm
Accessories: Adjustment mounts HSF01 or HSF02

Tab 3

Tab 3 Inhalt

Tab 4

Tab 4 Inhalt

Tab 5
Bild 1
 GTH TopHat width
Beschreibung 1
 Top Hat sizes
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Beschreibung 2
 GTH-5-250-4 in operation
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Beschreibung 3
Bild 4
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Bild 5
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Bild 6
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Beschreibung 10
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