Top Hat Beam Shaping Lens FBS2
FBS2 series Top Hat beam shapers are single-piece optical elements that transform a Gaussian laser beam into a square top-hat profile. FBS2 are focal beam shapers, while they generate the top-hat profile at the focal… Read more →
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| SKU | Input Beam Diameter @ 1/e² · Operation Wavelength | |
|---|---|---|
| FBS2-1030-1.0 | 1.0 mm·1030 nm |
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| FBS2-1030-1.5 | 1.5 mm·1030 nm |
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| FBS2-1030-2.0 | 2.0 mm·1030 nm |
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| FBS2-1030-2.5 | 2.5 mm·1030 nm |
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| FBS2-1030-3.0 | 3.0 mm·1030 nm |
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| FBS2-1030-3.5 | 3.5 mm·1030 nm |
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| FBS2-1030-4.0 | 4.0 mm·1030 nm |
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| FBS2-1030-4.5 | 4.5 mm·1030 nm |
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| FBS2-1030-5.0 | 5.0 mm·1030 nm |
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| FBS2-1030-5.5 | 5.5 mm·1030 nm |
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| FBS2-1030-6.0 | 6.0 mm·1030 nm |
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| FBS2-1064-1.0 | 1.0 mm·1064 nm |
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| FBS2-1064-1.5 | 1.5 mm·1064 nm |
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| FBS2-1064-2.0 | 2.0 mm·1064 nm |
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| FBS2-1064-2.5 | 2.5 mm·1064 nm |
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| FBS2-1064-3.0 | 3.0 mm·1064 nm |
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| FBS2-1064-3.5 | 3.5 mm·1064 nm |
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| FBS2-1064-4.0 | 4.0 mm·1064 nm |
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| FBS2-1064-4.5 | 4.5 mm·1064 nm |
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| FBS2-1064-5.0 | 5.0 mm·1064 nm |
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| FBS2-1064-5.5 | 5.5 mm·1064 nm |
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| FBS2-1064-6.0 | 6.0 mm·1064 nm |
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| FBS2-343-1.0 | 1.0 mm·343 nm |
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| FBS2-343-1.5 | 1.5 mm·343 nm |
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| FBS2-343-2.0 | 2.0 mm·343 nm |
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| FBS2-343-2.5 | 2.5 mm·343 nm |
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| FBS2-343-3.0 | 3.0 mm·343 nm |
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| FBS2-343-3.5 | 3.5 mm·343 nm |
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| FBS2-343-4.0 | 4.0 mm·343 nm |
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| FBS2-343-4.5 | 4.5 mm·343 nm |
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| FBS2-343-5.0 | 5.0 mm·343 nm |
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| FBS2-343-5.5 | 5.5 mm·343 nm |
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| FBS2-343-6.0 | 6.0 mm·343 nm |
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| FBS2-355-1.0 | 1.0 mm·355 nm |
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| FBS2-355-1.5 | 1.5 mm·355 nm |
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| FBS2-355-2.0 | 2.0 mm·355 nm |
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| FBS2-355-2.5 | 2.5 mm·355 nm |
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| FBS2-355-3.0 | 3.0 mm·355 nm |
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| FBS2-355-3.5 | 3.5 mm·355 nm |
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| FBS2-355-4.0 | 4.0 mm·355 nm |
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| FBS2-355-4.5 | 4.5 mm·355 nm |
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| FBS2-355-5.0 | 5.0 mm·355 nm |
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| FBS2-355-5.5 | 5.5 mm·355 nm |
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| FBS2-355-6.0 | 6.0 mm·355 nm |
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| FBS2-515-1.0 | 1.0 mm·515 nm |
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| FBS2-515-1.5 | 1.5 mm·515 nm |
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| FBS2-515-2.0 | 2.0 mm·515 nm |
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| FBS2-515-2.5 | 2.5 mm·515 nm |
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| FBS2-515-3.0 | 3.0 mm·515 nm |
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| FBS2-515-3.5 | 3.5 mm·515 nm |
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| FBS2-515-4.0 | 4.0 mm·515 nm |
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| FBS2-515-4.5 | 4.5 mm·515 nm |
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| FBS2-515-5.0 | 5.0 mm·515 nm |
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| FBS2-515-5.5 | 5.5 mm·515 nm |
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| FBS2-515-6.0 | 6.0 mm·515 nm |
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| FBS2-532-1.0 | 1.0 mm·532 nm |
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| FBS2-532-1.5 | 1.5 mm·532 nm |
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| FBS2-532-2.0 | 2.0 mm·532 nm |
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| FBS2-532-2.5 | 2.5 mm·532 nm |
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| FBS2-532-3.0 | 3.0 mm·532 nm |
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| FBS2-532-3.5 | 3.5 mm·532 nm |
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| FBS2-532-4.0 | 4.0 mm·532 nm |
Out of stock
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| FBS2-532-4.5 | 4.5 mm·532 nm |
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| FBS2-532-5.0 | 5.0 mm·532 nm |
Out of stock
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| FBS2-532-5.5 | 5.5 mm·532 nm |
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| FBS2-532-6.0 | 6.0 mm·532 nm |
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No catalog variant matches your exact spec. Add it to your cart as a quote request — sales will confirm price and lead time within 1 business day.
Specifications
SPOT GEOMETRY
| Top Hat width | approximately 2 * λ * f / d, with f = focal length, d = beam diameter @1/e2 |
| Efficiency | up to 90% |
| Homogeneity | ca. ± 2.5% (rel. to average intensity of the Top Hat plateau) |
| Side modes (strongest) | ~16.5x weaker than line plateau (< 1.5% of input energy) |
| Depth of focus (DOF) | ~60% of the Rayleigh length |
SUBSTRATE SPECIFICATIONS
| Material | Fused silica |
| Transmission | >99% |
| Damage threshold @ 10 ns | 10 J/cm² @ 1064 nm 5 J/cm² @ 532 nm 3 J/cm² @ 355 nm |
| Dimensions | ⌀25.4 x 3 mm |
Description
FBS2 series Top Hat beam shapers are single-piece optical elements that transform a Gaussian laser beam into a square top-hat profile. FBS2 are focal beam shapers, while they generate the top-hat profile at the focal plane of focusing optics. Each FBS2 lens is designed for a fixed input beam diameter (@1/e²) and specific operation wavelength. Beam shaping lens can be easily integrated into the beam path at nearly any position, even in front of or within a beam expander / telescope.
FBS2 generate Top Hat spots with a long depth of focus (DOF). The depth of focus for a flat-top beam is around 60% of the Rayleigh length of a Gaussian spot in a similar optical setup. The Top Hat width is approximately 1.5 times larger than the Gaussian spot size. Within this range, the Top Hat profile is uniform and shows nearly constant peak intensity.
The width of the Top Hat profile generated by FBS2 is approximately 1.5 times larger than the diffraction-limited Gaussian spot size. Top-Hat size depends on the focal length of the focusing optics (f), input laser beam diameter @1/e² (d), and operation wavelength (λ). Output spot size is typically smaller than 100 µm, and can easily be scaled using additional focusing optics.
The approximate size of the Top Hat can be calculated by the formula:
2 * λ * f / d or λ / NA, where NA is the numerical aperture of the focused beam.
FBS2 beam shaper can be combined with any objective or F-Theta lens