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).
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.
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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 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