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Top Hat Beam Shaping Lens FBSL

Top Hat Beam Shaping Lens FBSL

FBSL beam shapers generate narrow and homogeneous line spots. FBSL generates a Top Hat profile along the line, while across the line the shape is Gaussian to allow the smallest line width. Length and width ratio is around 1.6 : 1 @ 1/e², 2.2 : 1 @ FWHM.

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Products
Specifications
Operation Instructions
Description
Operation Wavelength
Input Beam Diameter @ 1/e²
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Code Operation Wavelength Input Beam Diameter @ 1/e² Price Delivery Add to cart
FBSL-1064-1.0 1064 nm 1.0 mm 1736 $ Request
FBSL-1064-1.5 1064 nm 1.5 mm 1736 $ Request
FBSL-1064-2.0 1064 nm 2.0 mm 1736 $ Request
FBSL-1064-2.5 1064 nm 2.5 mm 1736 $ Request
FBSL-1064-3.0 1064 nm 3.0 mm 1736 $ Request
FBSL-1064-3.5 1064 nm 3.5 mm 1736 $ Request
FBSL-1064-4.0 1064 nm 4.0 mm 1736 $ Request
FBSL-1064-4.5 1064 nm 4.5 mm 1736 $ Request
FBSL-1064-5.0 1064 nm 5.0 mm 1736 $ Request
FBSL-1064-5.5 1064 nm 5.5 mm 1736 $ Request
FBSL-1064-6.0 1064 nm 6.0 mm 1736 $ Request
FBSL-1030-1.0 1030 nm 1.0 mm 1736 $ Request
FBSL-1030-1.5 1030 nm 1.5 mm 1736 $ Request
FBSL-1030-2.0 1030 nm 2.0 mm 1736 $ Request
FBSL-1030-2.5 1030 nm 2.5 mm 1736 $ Request
FBSL-1030-3.0 1030 nm 3.0 mm 1736 $ Request
FBSL-1030-3.5 1030 nm 3.5 mm 1736 $ Request
FBSL-1030-4.0 1030 nm 4.0 mm 1736 $ Request
FBSL-1030-4.5 1030 nm 4.5 mm 1736 $ Request
FBSL-1030-5.0 1030 nm 5.0 mm 1736 $ Request
FBSL-1030-5.5 1030 nm 5.5 mm 1736 $ Request
FBSL-1030-6.0 1030 nm 6.0 mm 1736 $ Request
FBSL-532-1.0 532 nm 1.0 mm 1736 $ Request
FBSL-532-1.5 532 nm 1.5 mm 1736 $ Request
FBSL-532-2.0 532 nm 2.0 mm 1736 $ Request
FBSL-532-2.5 532 nm 2.5 mm 1736 $ Request
FBSL-532-3.0 532 nm 3.0 mm 1736 $ Request
FBSL-532-3.5 532 nm 3.5 mm 1736 $ Request
FBSL-532-4.0 532 nm 4.0 mm 1736 $ Request
FBSL-532-4.5 532 nm 4.5 mm 1736 $ Request
FBSL-532-5.0 532 nm 5.0 mm 1736 $ Request
FBSL-532-5.5 532 nm 5.5 mm 1736 $ Request
FBSL-532-6.0 532 nm 6.0 mm 1736 $ Request
FBSL-515-1.0 515 nm 1.0 mm 1736 $ Request
FBSL-515-1.5 515 nm 1.5 mm 1736 $ Request
FBSL-515-2.0 515 nm 2.0 mm 1736 $ Request
FBSL-515-2.5 515 nm 2.5 mm 1736 $ Request
FBSL-515-3.0 515 nm 3.0 mm 1736 $ Request
FBSL-515-3.5 515 nm 3.5 mm 1736 $ Request
FBSL-515-4.0 515 nm 4.0 mm 1736 $ Request
FBSL-515-4.5 515 nm 4.5 mm 1736 $ Request
FBSL-515-5.0 515 nm 5.0 mm 1736 $ Request
FBSL-515-5.5 515 nm 5.5 mm 1736 $ Request
FBSL-515-6.0 515 nm 6.0 mm 1736 $ Request
FBSL-355-1.0 355 nm 1.0 mm 1736 $ Request
FBSL-355-1.5 355 nm 1.5 mm 1736 $ Request
FBSL-355-2.0 355 nm 2.0 mm 1736 $ Request
FBSL-355-2.5 355 nm 2.5 mm 1736 $ Request
FBSL-355-3.0 355 nm 3.0 mm 1736 $ Request
FBSL-355-3.5 355 nm 3.5 mm 1736 $ Request
FBSL-355-4.0 355 nm 4.0 mm 1736 $ Request
FBSL-355-4.5 355 nm 4.5 mm 1736 $ Request
FBSL-355-5.0 355 nm 5.0 mm 1736 $ Request
FBSL-355-5.5 355 nm 5.5 mm 1736 $ Request
FBSL-355-6.0 355 nm 6.0 mm 1736 $ Request
FBSL-343-1.0 343 nm 1.0 mm 1736 $ Request
FBSL-343-1.5 343 nm 1.5 mm 1736 $ Request
FBSL-343-2.0 343 nm 2.0 mm 1736 $ Request
FBSL-343-2.5 343 nm 2.5 mm 1736 $ Request
FBSL-343-3.0 343 nm 3.0 mm 1736 $ Request
FBSL-343-3.5 343 nm 3.5 mm 1736 $ Request
FBSL-343-4.0 343 nm 4.0 mm 1736 $ Request
FBSL-343-4.5 343 nm 4.5 mm 1736 $ Request
FBSL-343-5.0 343 nm 5.0 mm 1736 $ Request
FBSL-343-5.5 343 nm 5.5 mm 1736 $ Request
FBSL-343-6.0 343 nm 6.0 mm 1736 $ Request

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

REQUIREMENTS FOR OPERATION

 

Input beam Gaussian beam TEM00, M² of 1.4 or better
Apertures within the optical setup Clear aperture along the whole beam path should be at least 2x larger than the beam diameter @ 1/e²

 

INTEGRATION INTO BEAM PATH

 

Alignment

Alignment in lateral direction (translation) is necessary.
Rotation around the optical axis helps to align the orientation of the Top Hat.

Recommended mount: 840-0240 X-Y translation positioner.

Optical equipment Required: focusing optics. Top Hat is generated in the focal plane of this optic.
Useful: beam expander for adjustment of the beam diameter (effective beam diameter to the FBS2 design input beam diameter) and for adjustment of the beam diameter to the desired spot size.
Helpful: beam profiler to check the profiles while aligning.

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.