To answer the demand for fine-tuning abilities of various output parameters when using a DOE, such as: shape/spot size, separation/divergence angle, etc., HOLO/OR designed a variable beam expander, optimized for use with Top-Hat beam shaper, Homogenizer, MultiSpot, and other DOE products. Another application is the fine-tuning of incident beam size before DOE for Top-Hat application, where precision of incident beam size is important.
This BE variable zoom module enables smooth transition from beam reduction (down to X0.8) to expansion (up to X1.2), and accepts large divergence angles, making it ideally suitable for DOE shapers and splitters fine tuning.
The DOE tuner presents the following features:
- Very low wavefront error
- No need to change module direction
- Sliding lenses
- Constant mechanical size
- Fused Silica lens material
- Wavelength range = 266-1064 [nm]
- Other wavelengths upon request
The DOE tuner standard Products
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DOE Tuner module video
Optical Properties
| Wavelength range | 266-1064 nm |
| Beam expander | x0.8-x1.2 |
| Clear aperture | 23 mm |
| Max. input beam diameter (1/e2) | Ø8.4 mm (0.8x), Ø7.0 mm (1.2x) |
| Max. output beam size | 8.4 mm |
| Max. incident angle* | 0.5 degrees |
Mechanical Properties
| Module length | 150 mm |
| External diameter | 50.8 mm |
| Adapter | C-mount |
| Lens material | Fused Silica |
Mechanical drawing
Different configurations for using the DOE-Tuner module
1. Placing the DOE-Tuner before a DOE
- Purpose – Fine tuning for input beam size
- Benefit:
- For Top-Hat beam shaper – achieves nominal beam size
- For Beam-Splitters, Multi-Focal and Vortex phase plate – controls spot size
- Key parameters:
| Parameter: | Magnification < 1 | Magnification > 1 |
| Beam size: | Decreases | Increases |
| Spot size: | Increases | Decreases |
| Separation angle: | No change | No change |
2. Placing the DOE-Tuner after a DOE
- Purpose – controlling divergence of the output beam, allows to vary key parameters of DOE in range of 80-120%
- Benefit:
- Multi-Spot – controls the separation angle
- Multifocal – controls the separation between foci
- Top-Hat , Homogenizer & others – controls the image size
- Key parameters:
| Parameter: | Magnification < 1 | Magnification > 1 |
| Beam size: | No change | No change |
| Spot size: | Increases | Decreases |
| Separation angle: | Increases | Decreases |
General Set-Up
A Zemax Black Box of the DOE Tuner is available for different wavelengths:
A Zemax Black Box of the DOE tuner is also available for other wavelengths upon request.
Click here for a user manual for the DOE Tuner module.
