+55 11 2839-3209
+55 11 2839-3209 
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;
Square top hat size and correspondingly working distance can be changed by placing extra lens or objective behind beam shaping lens GTH-5-250-4.
Dependence of square size and working distance vs focal length of additional lens or objective:
| Focal length, mm | Top hat square size, mm | Working distance, mm |
| +50 | 0.67 x 0.67 | 42 |
| +100 | 1.1 x 1.1 | 71 |
| +200 | 1.8 x 1.8 | 111 |
| +300 | 2.2 x 2.2 | 136 |
| -1000 | 5.3 x 5.3 | 333 |
| -500 | 8.0 x 8.0 | 500 |
GTH-5-250-4 Operation Specifications
| Recommended operation wavelength range | 400-1500 nm |
| Input beam TEM00, diameter (1/e²): | 5.0 ± 0.15 mm |
| Output beam | Top hat size at 250 mm working distance: 4 × 4 mm² (adjustable with additional lens) |
| Working distance | 250 mm (adjustable with additional lens) |
| 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 ± 0.1 mm |
| Thickness | 4.0 ± 0.1 mm |