Overview
These types of beam shapers have a free-form surface which redistributes a Gaussian beam profile (TEM00) into a square Top-Hat profile. The combination with cylindrical optics allows to generate also homogeneous line profiles.Topag offers three different models which deliver Top-Hats of different sizes and working distances. The achievebale Top-Hat sizes are for the GTH-3.6-1.75 and GTH-4-2.2 in the range of 30 µm up to 1 mm and for the GTH-5-250/4 in the range of 500 μm to few centimeters. Both models operate within a large wavelength range from VIS to NIR. For GTH beam shapers the focal length of the focusing optic determines the Top-Hat size in the focal plane.
Specifications
Gauss-to-Top Hat beam shaping lens(GTH)
| Model | GTH-5-250/4 | GTH-4.0-2.2 | GTH-3.6-1.75 |
|---|---|---|---|
| Input beam diameter(1/e2) | 5.0 mm±0.15 mm | 4.0 mm±0.15 mm | 3.6 mm±0.15 mm |
| Working distance | 250mm | - | - |
| Full fan angle | - | 2.2 mrad | 1.75 mrad |
| Wavelength range | 400 nm～1550 nm | ||
| AR coating(R<1%) | VIS：400 nm～700 nm/IR：700 nm～1300 nm/1064 nm/532 nm | ||
| Damage threshold | 3 J/cm2@532 nm、10 ns | ||
| Diameter | 11.0 mm (mounted in ring holder、diameter 1 inch) | ||
| Thickness | 4.0 mm±0.1 mm(mounted in ring holder、diameter 1 inch：6.6 mm) | ||
| Lens material | LF5 | ||
| Accessories | adjustable x-y-θ holder | ||
Fundamental Beam-mode Shaping(FBS)
| Input beam diameter(1/e2) | 2.0 mm、3.0 mm・・・、10 mm±5.0 % (others on request) | ||
| Working distance | 1064 nm、532 nm、355 nm(others on request) | ||
| Wavelength(AR coating) | >98% | ||
| Damage threshold | 4 J/cm2@532 nm、10 ns | ||
| Diameter | 25.4 mm±0.1 mm | ||
| Lens material | Fused silica | ||
| Accessories | adjustable x-y-θ holder | ||
- ＊Round form available
Diffractive Beam Splitters(DBS)
| Dimensions | 1-dimension：1×2/1×3/1×5/1×9(others on request) |
| 2-dimension：3×3/4×4/5×5 | |
| Grating area | 12 mm×12 mm2 |
| Wavelength | 1064 nm、800 nm、532 nm、355 nm(others on request) |
| Damage threshold | 3 J/cm2@10 ns |
| Diameter | 25.4 mm±0.1 mm |
| Lens material | Fused silica |
| Accessories | adjustable x-y-θ holder |
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