These double crystal quartz wedges are so oriented
as to cause a "depolarization" of polarized light, which
is to say that if our Depolarizer is situated between a Polarizer
and a rotating Analyzer, the resulting light transmitted through
the Analyzer will not vary in intensity.
One type of depolarizer, the Lyot, does not have a
“fast” or preferred axis. However, it is not entirely
achromatic, and has wavelength periodicity in its depolarized spectrum.
Another type is the wedge depolarizer. It is achromatic, but has
a preferred axis, meaning that this axis must be oriented at 45°
with respect to the plane of polarization, thus making it unusable
in applications wherein the plane of polarization varies in attitude.
The OFR Depolarizer is a proprietary design. It is achromatic throughout its operating spectrum with no wavelength periodicity. Further, it does not possess a fast or preferred axis, so that it is effective in varying polarization applications. Being optically contacted, these can be used in the UV. Performance is optimized with expanded beams, >6 mm diameter. Power rating is ~
100 W/cm 2 CW.. The DPU-15 is mounted in our standard retarder cell (see photo). The DPU-25 is not mounted. Antireflection coatings are optional.
350 - 600 nm
600 - 900 nm
1250 - 1620 nm
Note: When ordering, specify coating code: ex. DPU-25-NIR