Top Hat Beam Shaping Lens FBSL
FBSL series Top Hat beam shapers are single-piece optical elements designed for the generation of square Top Hat profiles. FBSL beam shapers are so-called focal beam shapers and can generate a Top Hat profile in the… Read more →
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| SKU | Input Beam Diameter @ 1/e² · Operation Wavelength | |
|---|---|---|
| FBSL-1030-1.0 | 1.0 mm·1030 nm |
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| FBSL-1030-1.5 | 1.5 mm·1030 nm |
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| FBSL-1030-2.0 | 2.0 mm·1030 nm |
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| FBSL-1030-2.5 | 2.5 mm·1030 nm |
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| FBSL-1030-3.0 | 3.0 mm·1030 nm |
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| FBSL-1030-3.5 | 3.5 mm·1030 nm |
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| FBSL-1030-4.0 | 4.0 mm·1030 nm |
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| FBSL-1030-4.5 | 4.5 mm·1030 nm |
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| FBSL-1030-5.0 | 5.0 mm·1030 nm |
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| FBSL-1030-5.5 | 5.5 mm·1030 nm |
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| FBSL-1030-6.0 | 6.0 mm·1030 nm |
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| FBSL-1064-1.0 | 1.0 mm·1064 nm |
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| FBSL-1064-1.5 | 1.5 mm·1064 nm |
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| FBSL-1064-2.0 | 2.0 mm·1064 nm |
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| FBSL-1064-2.5 | 2.5 mm·1064 nm |
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| FBSL-1064-3.0 | 3.0 mm·1064 nm |
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| FBSL-1064-3.5 | 3.5 mm·1064 nm |
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| FBSL-1064-4.0 | 4.0 mm·1064 nm |
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| FBSL-1064-4.5 | 4.5 mm·1064 nm |
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| FBSL-1064-5.0 | 5.0 mm·1064 nm |
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| FBSL-1064-5.5 | 5.5 mm·1064 nm |
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| FBSL-1064-6.0 | 6.0 mm·1064 nm |
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| FBSL-343-1.0 | 1.0 mm·343 nm |
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| FBSL-343-1.5 | 1.5 mm·343 nm |
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| FBSL-343-2.0 | 2.0 mm·343 nm |
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| FBSL-343-2.5 | 2.5 mm·343 nm |
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| FBSL-343-3.0 | 3.0 mm·343 nm |
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| FBSL-343-3.5 | 3.5 mm·343 nm |
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| FBSL-343-4.0 | 4.0 mm·343 nm |
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| FBSL-343-4.5 | 4.5 mm·343 nm |
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| FBSL-343-5.0 | 5.0 mm·343 nm |
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| FBSL-343-5.5 | 5.5 mm·343 nm |
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| FBSL-343-6.0 | 6.0 mm·343 nm |
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| FBSL-355-1.0 | 1.0 mm·355 nm |
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| FBSL-355-1.5 | 1.5 mm·355 nm |
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| FBSL-355-2.0 | 2.0 mm·355 nm |
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| FBSL-355-2.5 | 2.5 mm·355 nm |
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| FBSL-355-3.0 | 3.0 mm·355 nm |
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| FBSL-355-3.5 | 3.5 mm·355 nm |
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| FBSL-355-4.0 | 4.0 mm·355 nm |
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| FBSL-355-4.5 | 4.5 mm·355 nm |
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| FBSL-355-5.0 | 5.0 mm·355 nm |
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| FBSL-355-5.5 | 5.5 mm·355 nm |
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| FBSL-355-6.0 | 6.0 mm·355 nm |
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| FBSL-515-1.0 | 1.0 mm·515 nm |
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| FBSL-515-1.5 | 1.5 mm·515 nm |
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| FBSL-515-2.0 | 2.0 mm·515 nm |
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| FBSL-515-2.5 | 2.5 mm·515 nm |
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| FBSL-515-3.0 | 3.0 mm·515 nm |
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| FBSL-515-3.5 | 3.5 mm·515 nm |
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| FBSL-515-4.0 | 4.0 mm·515 nm |
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| FBSL-515-4.5 | 4.5 mm·515 nm |
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| FBSL-515-5.0 | 5.0 mm·515 nm |
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| FBSL-515-5.5 | 5.5 mm·515 nm |
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| FBSL-515-6.0 | 6.0 mm·515 nm |
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| FBSL-532-1.0 | 1.0 mm·532 nm |
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| FBSL-532-1.5 | 1.5 mm·532 nm |
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| FBSL-532-2.0 | 2.0 mm·532 nm |
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| FBSL-532-2.5 | 2.5 mm·532 nm |
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| FBSL-532-3.0 | 3.0 mm·532 nm |
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| FBSL-532-3.5 | 3.5 mm·532 nm |
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| FBSL-532-4.0 | 4.0 mm·532 nm |
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| FBSL-532-4.5 | 4.5 mm·532 nm |
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| FBSL-532-5.0 | 5.0 mm·532 nm |
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| FBSL-532-5.5 | 5.5 mm·532 nm |
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| FBSL-532-6.0 | 6.0 mm·532 nm |
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Specifications
SPOT GEOMETRY
| Line length (Top Hat) | approximately 2 * λ * f / d, with f = focal length, d = beam diameter @1/e2 |
| Line width (Gaussian) | similar to the diameter of the Gaussian spot in the same optical configuration |
| Efficiency | up to 92.5% |
| Homogeneity | ca. ± 2.5% (rel. to average intensity of the Top Hat plateau) |
| Side modes (strongest) | ~15x weaker than line plateau (< 1.7% of input energy) |
| Depth of focus (DOF) | ~50% 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
FBSL series Top Hat beam shapers are single-piece optical elements designed for the generation of square Top Hat profiles. FBSL beam shapers are so-called focal beam shapers and can generate a Top Hat profile in the focal plane of nearly any focusing optics. Each FBSL lens is designed for a fixed input beam diameter (@1/e²) and specific operation wavelength. FBSL beam shaper can be combined with any objective or F-Theta lens, it can be integrated into the beam path at nearly any position, even in front of or within a beam expander / telescope.
FBSL generate Top Hat spots with long depth of focus (DOF), which is about 50% of the Rayleigh length compared to a Gaussian spot in a similar optical setup. Within this range the Top Hat profile doesn’t change and shows nearly constant peak intensity.
The size of the Top Hat size depends on the focal length of the focusing optics (f), the beam diameter @1/e² (d), and the operation wavelength (λ).
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.