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Fresnel Rhomb Retarders

Available in 3 different types
Wavelength ranges from 400 to 900 nm

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




Single Fresnel Rhomb Quarter-wave retarder

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.

Double Fresnel Rhomb Quarter-Wave Retarder




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.

Double Fresnel Rhomb Half-wave retarder

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 25 273.00
HO-DFRQ-10 Double Fresnel Rhomb Quarter-wave Retarder λ/4 25 641.00
HO-DFRH-10 Double Fresnel Rhomb Half-wave Retarder λ/2 25 504.50

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