Fresnel Rhomb retarders give half-wave or quarter-wave retardation nearly independent of wavelengths. Holmarc’s Fresnel rhombs are designed in such a way that a 22.5° or 45° phase shift occurs at each internal reflection creating a total half-wave or quarter-wave retardance. Holmarc’s mounted Fresnel rhombs are manufactured in BK7 or equivalent substrate and are available in 3 different types.
Material | : | BK7 or equivalent |
Surface quality | : | 20 - 10 ( scratch - dig ) |
Clear aperture | : | 10 mm, + 0.00, - 0.2 mm |
Retardance variation | : | 2 % |
Wavelength range | : | 400 - 900 nm |
A single Fresnel rhomb quarter wave retarder produces a phase shift of 90 (λ/4) due to internal reflections at two surfaces. This rhomb gives an output parallel to the input, but laterally displaced.
A Double Fresnel rhomb quarter wave retarder produces a phase shift of 90 (λ/4) by the internal reflections at four surfaces. This rhomb has co-axial input and output.
A Double Fresnel rhomb Half-wave retarder produces a phase shift of 180 (λ) by the internal reflections at four surfaces. This rhomb has co-axial input and output.
Model No. | Type | Retardation | Mount Diameter ( mm ) | Price ($) |
HO-SFRQ-10 | Single Fresnel Rhomb Quarter-wave Retarder | λ/4 | 25 | 300.00 |
HO-DFRQ-10 | Double Fresnel Rhomb Quarter-wave Retarder | λ/4 | 25 | 705.00 |
HO-DFRH-10 | Double Fresnel Rhomb Half-wave Retarder | λ/2 | 25 | 555.00 |
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