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The retardance data above illustrates the relatively wavelength-independent design of these rhombs for the specified wavelength range.
- Quarter-Wave or Half-Wave Retardance
- Broader Wavelength Range than Waveplates
- Cemented Prisms (FR600HM)
Fresnel Rhomb Retarders act like broadband waveplates providing uniform λ/4 or λ/2 retardance over a wider range of wavelengths than possible with birefringent waveplates. They can replace retardation plates for broadband, multi-line or tunable laser sources.
The rhomb is designed so that a 45° phase shift occurs at each internal reflection creating a total retardance of λ/4. Because the phase shift is a function of the slowly varying rhomb dispersion, the retardance change with wavelength is much lower than other types of retarders. The half wave retarder combines two quarter wave rhombs. These mounted versions are engraved with the part number and are SM1-threaded, allowing for easy installation using Thorlabs rotation mounts like the RSP1 and PRM1.
|Retardance Variation||2% for 600-1550 nm (Typical)
5% @ 400 nm (Max)
|Wavelength Range||400-1550 nm|
|Clear Aperture||Ø10.0 mm +0.0/-0.1 mm|
|Surface Quality of Input
and Output Faces
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SM1-Threaded (1.035"-40) Mount Engraved with Item Description
|Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.|
Beam path shown in blue. To achieve an output polarization that is rotated with respect to the initial polarization, the input polarization must not be aligned with the fast or slow axis.
Beam path shown in blue. To achieve circular output polarization, the beam must have an initial polarization that is 45° from the fast axis, engraved on the retarder.