Fresnel Rhomb Retarders, like Achromatic Waveplate, can provide a uniform retardation over a wide range of wavelengths. Since the retardation of Fresnel Rhomb Retarders only depends on the refractive index and geometry of the material, the wavelength range is wider than Achromatic Waveplate made from birefringent crystal. A Single Fresnel Rhomb Retarders produces a phase retardation of λ/4, the output light is parallel to the input light, but laterally displaced; A Double Fresnel Rhomb Retarders produces a phase retardation of λ/2, it consists of two Single Fresnel Rhomb Retarders. CRYLINK provides standard BK7 Fresnel Rhomb Retarders, other material like ZnSe and CaF2 is available upon request.


Basic Parameters

Dimensional tolerance+0.0/-0.2mm
surface quality40/20
Clear Aperture>90% central area
Retardation tolerance<λ/50
Standard Wavequarter-wave(λ/4),
Wavelength range400-1600nm
MaterialK9 Fresnel PrismJGS1 Fresnel PrismZnSe Fresnel Prism
Operating Wavelength350-2000nm185-2100nm600-16000nm
surface quality20/1020/1040/20
Retardation1/4 or 1/2,Customized to customer requirements
Retardation tolerance2% (typical)


Fresnel Diamond Phase Delayer Spectrogram


  • Wide bandwidth of wavelength
  • Provide λ/4 and λ/2 Phase Delay
  • Compliance with RoHS


  • Usually used in spectroscopic instruments such as ellipsometers