GTH-S-4.0-2.0 - Gaussian to Top Hat Beam Shaping Lens

GTH beam shapers have a free-form surface which redistributes a Gaussian beam (TEM00) into a square Top Hat. GTH-S-4.0-2.0 is made of UVFS which allows ultra-short pulse applications with highest power densities and wavelengths from UV to NIR. Top Hat width and working distance can be scaled by the optical setup. The beam shaper can be integrated into the beam path at nearly any position, even in front of or within a beam expander. You should only take into account that the required beam diameter at the position of the shaper is 4.0mm (1/e2).

Description 

Top Hat Beam Shapers

Top Hat beam shapers GTH-S-4.0-2.0 work together with nearly any focussing optic. The Top Hat profile is generated in the focal plane of the focusing optic with a size of 4µm/NA (NA = numerical aperture of focused beam = beam radius / focus length). By varying the focal length, it is possible to scale Top Hat size and working distance. Thus, the focal length of the additional focusing optic determines the Top Hat width which is typically in the range from 100µm to 5mm.

GTH-S-4.0-6.0 requires a 4.0 mm @ 1/e2 input beam diameter. These beam shapers operate within a large wavelength range from UV to NIR. TOPAG offers the beam shapers with different standard AR/AR coatings: Broadband coatings @ UV (210 - 400 nm), VIS (400 - 700 nm) or IR (650 - 1100 nm), a dual line coating @ 505 - 535 + 1010 - 1070 nm and a narrowband coating @ 337 - 357 nm. Also available are other AR/AR coatings on request.

Product code: GTH-S-4.0-2.0-Coating

 

 

Specifications 
Model GTH-S-4.0-2.0
Top Hat width full fan angle of 2 mrad
Efficiency > 95% of input energy within Top Hat profile
Homogenity about ±5% (rel. to average intensity of the Top Hat plateau)
Depth of Top Hat shape (DOF) depends on optical setup; for example 1.5 mm depth using 4.0 mm
beam diameter, wavelength 532 nm and 250 mm focal length
Input beam single or multimode laser beam with Gaussian energy distribution
Input beam diameter TEM00, Ø 4.0mm (@1/e²)
Necessary free aperture always 2.5x beam diameter (@1/e²), along total beam path
Material fused silica
Dimensions 1) dia. 1 inch x 3 mm thickness
Standard AR/AR Coatings 1): Wavelength range, transmission and damage threshold
343/355 337 - 357 nm; T > 99.6%; LDT 4 J/cm2 @ 10 ns
515/532+1030/1064 505 - 535 nm + 1010 - 1070 nm; T > 99.8%; LDT 10 J/cm2 @ 10 ns
UV 210 - 400 nm; T > 96%; LDT 1 J/cm2 @ 10 ns
VIS 400 - 700 nm; T > 98.2%; LDT 2 J/cm2 @ 10 ns
IR 650 - 1100 nm; T > 98.6%; LDT 3 J/cm2 @ 10 ns

1) Others on request.

 

Accessories: adjustable x-y holder HSF02, optionally beam expander.

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  • Description
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Top Hat Beam Shapers

Top Hat beam shapers GTH-S-4.0-2.0 work together with nearly any focussing optic. The Top Hat profile is generated in the focal plane of the focusing optic with a size of 4µm/NA (NA = numerical aperture of focused beam = beam radius / focus length). By varying the focal length, it is possible to scale Top Hat size and working distance. Thus, the focal length of the additional focusing optic determines the Top Hat width which is typically in the range from 100µm to 5mm.

GTH-S-4.0-6.0 requires a 4.0 mm @ 1/e2 input beam diameter. These beam shapers operate within a large wavelength range from UV to NIR. TOPAG offers the beam shapers with different standard AR/AR coatings: Broadband coatings @ UV (210 - 400 nm), VIS (400 - 700 nm) or IR (650 - 1100 nm), a dual line coating @ 505 - 535 + 1010 - 1070 nm and a narrowband coating @ 337 - 357 nm. Also available are other AR/AR coatings on request.

Product code: GTH-S-4.0-2.0-Coating

 

 

Model GTH-S-4.0-2.0
Top Hat width full fan angle of 2 mrad
Efficiency > 95% of input energy within Top Hat profile
Homogenity about ±5% (rel. to average intensity of the Top Hat plateau)
Depth of Top Hat shape (DOF) depends on optical setup; for example 1.5 mm depth using 4.0 mm
beam diameter, wavelength 532 nm and 250 mm focal length
Input beam single or multimode laser beam with Gaussian energy distribution
Input beam diameter TEM00, Ø 4.0mm (@1/e²)
Necessary free aperture always 2.5x beam diameter (@1/e²), along total beam path
Material fused silica
Dimensions 1) dia. 1 inch x 3 mm thickness
Standard AR/AR Coatings 1): Wavelength range, transmission and damage threshold
343/355 337 - 357 nm; T > 99.6%; LDT 4 J/cm2 @ 10 ns
515/532+1030/1064 505 - 535 nm + 1010 - 1070 nm; T > 99.8%; LDT 10 J/cm2 @ 10 ns
UV 210 - 400 nm; T > 96%; LDT 1 J/cm2 @ 10 ns
VIS 400 - 700 nm; T > 98.2%; LDT 2 J/cm2 @ 10 ns
IR 650 - 1100 nm; T > 98.6%; LDT 3 J/cm2 @ 10 ns

1) Others on request.

Accessories: adjustable x-y holder HSF02, optionally beam expander.

Do you have questions about GTH-S-4.0-2.0?
Your details will be gathered and handled to respond to your request.
Detailed information on this topic can be retrieved from our privacy policy.

Do you have questions about our products?

Write to us | info@topag.de

Give us a call | +49 6151 42944 0

TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt, Germany
Phone: +49 6151 42944 0
Fax: +49 6151 42944 11
E-mail: info@topag.de