+55 11 2839-3209

Gauss-to-Top Hat Beam Shaping Lenses GTH-5-250-4

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