All waveplates are BBAR coated and mounted by default
Custom design waveplates are available in small and mass production quantities
Achromatic waveplate (AWP) is a pair of crystal quartz and
magnesium fluoride plates.
Because of difference in dispersion in these uniaxial positive
crystals it is possible to calculate thickness of each plate so that
birefringent phase shift in assembly changes very slowly over
certain wavelength range. This is a way to obtain achromatic
zero order waveplates. Such AWPs are necessary for various
devices and may replace a number of ordinary quartz waveplates
operating at single wavelength only. We can offer series of
achromatic waveplates with phase shifts shown in graphs below.
Typical retardation curves for 650-1100 nm achromatic waveplates