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/cm² @ 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