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Gauss-To-Top Hat Beam Shaping Lens GTH-4-2.2FA

Gauss-to-Top Hat Beam Shaping Lens is a special form lens used to distribute energy of Gaussian beam to Top Hat profile

Lens Specifications:
Material: LF5 Schott glass;
n= 1.5659 @1060 nm;
n= 1.5848 @ 546 nm;
n= 1.6192 @ 365 nm;
Clear aperture:  dia 11.0 mm;
Damage threshold (uncoated): >3J/cm@ 532 nm, 10 ns;
Mounted in to 1” ring holder;

 

Working distance is given by focal length of additional lens which is always needed. Top Hat appears always at focal plane of additional lens.
For instance if an additional lens f = 100 is used, Top Hat appears at 100 mm behind additional lens. So GTH-4-2.2FA could be easily put in front of objectives for example.

The distance between GTH-4-2.2FA and additional lens is not critical (up to several tens of centimeters).
The full fan angle of Top-Hat generation for GTH-4-2.2FA is 2.2 mrad. This leads to Top-Hat sizes:
– 110×110 μm for lens with f = 50 at 50 mm distance
– 220×220 μm for lens with f = 100 at 100 mm distance
– 2.2×2.2 mm for lens with f = 1000 at 1000 mm distance
– 4.4×4.4 mm for lens with f = 2000 at 2000 mm distance

 

GTH-4-2.2FA Operation Specifications

Recommended operation
wavelength range
400-1550 nm
Input beam TEM00, diameter (1/e²): 4.0 ± 0.15 mm
Achievable Top Hat size 6x diffraction limited @ 1064 nm,
12x diffraction limited @ 532 nm
Full fan angle of Top-Hat generation 2.2 mrad
Beam energy distribution efficiency > 95% of input energy within Top Hat profile
Beam homogenity ± 5 % (rel. to average intensity within Top Hat)
Lens diameter 12.0 +0.0/-0.1 mm
Lens thickness 4.0 ± 0.1 mm