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Top Hat Beam Shaping Lens FBS2 SKU: FBS2-355-3.5
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…
Variant specifications
| Specification | Value |
|---|---|
| Operation Wavelength | 355 nm |
| Input Beam Diameter @ 1/e² | 3.5 mm |
Shared product specifications
These specifications apply across the Top Hat Beam Shaping Lens FBS2 product family.
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 |
Product brochures
Shared documentation for the complete product family.