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Features
 The Fresnel rhomb is used to rotate the plane of vibration of linearly polarized light. It consists of two optically contacted Fresnel parallelepipeds of crown glass BK 7 or quartz glass Suprasil which by total internal reflection together create a path difference of 180° between the components of light polarized perpendicular and parallel to the plane of incidence. Over a relatively wide range the retardation is only minimally wavelength dependent, see curve. This polarization rotator can only be used for very small acceptance angles. The parallelism error of the prism combination is less than 2". The end faces are adjusted perpendicular to the rotation axis. The usable aperture is 9.5 mm. The holder is provided with a graduated circle marked from 0° to 360° and is supplied with a mounting rod. The rhomb is mounted in easily rotatable ball bearings so that a motor drive can be fitted; however, the rotating parts are not balanced.
Specifications
1. BK7 Fresnel Rhomb Prism
Specifications:
Material: BK7
Diameter Tolerance: +0.0, -0.2mm
Clear Aperture: >80%
Flatness: λ/10 @ 632.8nm
Surface Quality: 20/10
Wavelength Range: 400-2000nm
Bevel: 0.2-0.5mm

Part No.  FRP1-101 FRP1-102
Ratardation  λ/4 λ/2
A(mm)  35 64
B(mm)  40 40
H(mm)  37 37



2. Fused Silica Fresnel Rhomb Prism
Specifications:
Material: Fused Silica
Diameter Tolerance: +0.0, -0.2mm
Clear Aperture: >80%
Flatness: λ/10 @ 632.8nm
Surface Quality: 20/10
Wavelength Range: 200-2000nm
Bevel: 0.2-0.5mm

Part No.  FRP2-101 FRP2-102
Ratardation  λ/4 λ/2
A(mm)  35 64
B(mm)  40 40
H(mm)  37 37