Fresnel Rhomb Retarders
Achromatic Retarders
Beam deviation £ 10arcsec
Anti-reflection coated
Standa manufactures Fresnel Rhombs and mounts for them. 14FR is a combination of a rhomb with a mount (see drawings). Fresnel Rhombs are made of BK7 crown glass or UV grade fused silica. A Single Fresnel Rhomb produces a phase shift of 90° (l/4) due to total internal reflections at two surfaces. A Double Fresnel Rhomb produces a phase shift of 180° (l/2) between the components of light polarized perpendicular and parallel to the plane of incidence.
It consists of two optically contacted (or air spaced) single Fresnel l/4 Rhombs. The retardation varies only slightly over a relatively wide range of wavelengths. Fresnel Rhombs mounts are cylindrical in shape. The end faces of a Fresnel retarder are adjusted orthogonal to the axis of rotation. The clear aperture of the mount is 10 mm.
There are several ways to mount the 10FR Fresnel rhomb retarder:
- on any adjustable unit (e.g. a stage) by the M6 and M4 tapped holes
- to our Polarizer Holder as 5PH50, 5PH51 or other compatible unit using the M27x1 thread
Fresnel rhomb Standard Specifications
Model | Retardation | wavelenght range, nm | L, mm | l, mm |
14FR1-NIR1-M27 | single (λ/4) | 700-1300 | 39.5 | 23.5 |
14FR1-NIR2-M27 | single (λ/4) | 1300-1600 | 39.5 | 23.5 |
14FR1-UV-M27 | single (λ/4) | 260-400 | 33.5 | 17.5 |
14FR1-VIS-M27 | single (λ/4) | 400-700 | 39.5 | 23.5 |
14FR2-NIR1-M27 | double (λ/2) | 700-1300 | 62 | 46 |
14FR2-NIR2-M27 | double (λ/2) | 1300-1600 | 62 | 46 |
14FR2-UV-M27 | double (λ/2) | 260-400 | 50 | 34 |
14FR2-VIS-M27 | double (λ/2) | 400-700 | 62 | 46 |