The Fresnel Rhomb Retarders offer unmatched performance in broad band, achromatic retardation.
These optics exploit the relative phase shift between orthogonal polarization states which occurs at the total internal reflection of a beam of light within a dielectric optic. Due to the large internal incidence angle required for this effect, these optics are very long and bulky.
The simplest design employs a single element. However, this means that the transmitted beam is strongly laterally displaced which can be very inconvenient – especially when the optic must be rotated. As an alternative, we offer dual elements which eliminate the lateral displacement. However, these items are even longer than the single elements.
As with all of our optics, we will gladly provide these items custom designed to your particular requirements. As an alternative, we offer a selection of standard items as specified below.
Material: N-BK7
Flatness: λ/10 at 633nm
Surface quality: 20-10 S/D (DIN: 5/2 x 0.1)
Wavelength Range: 400-2000 nm
Free Aperture: 10×10 mm
| Order No. | Retardation | Design | A (mm) | B (mm) | H (mm) |
|---|---|---|---|---|---|
| 50.260.00086 | λ/4 | Single element | 35.0 | 40.0 | 37.0 |
| 50.260.00087 | λ/2 | Dual element | 64.0 | 40.0 | 37.0 |
| 50.260.00112 | λ/4 | Dual element | 140.0 | 40.0 | 37.0 |
Material: UV grade fused silica
Flatness: λ/10 at 633nm
Surface quality: 20-10 S/D (DIN: 5/2 x 0.1)
Wavelength range: 200-2000 nm
Free Aperture: 10 x 10 mm
| Order No. | Retardation | Design | A (mm) | B (mm) | H (mm) |
|---|---|---|---|---|---|
| 50.260.00088 | λ/4 | Single element | 35.0 | 40.0 | 37.0 |
| 50.260.00089 | λ/2 | Dual element | 64.0 | 40.0 | 37.0 |
| 50.260.00113 | λ/4 | Dual element | 140.0 | 40.0 | 37.0 |
We take quality control very seriously: we rely on accurate, widely recognized measurement systems for testing our optics. The following table indicates the accuracy of measurement for the most relevant parameters.
Surface figure: λ/20
Angle: 0,5 arcsec
Radius: 0,01%
Focal length: 0,03%-0,3%
Centration: +/-0,2µm or +/-2 arcsec
Wavelength: +/-0,3nm (190-1100nm)
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