Waveplate:

Waveplates (retardation plates or phase shifters) are made from materials which exhibit birefringence, we usually use Quartz or Quartz+BK7. There are several kinds of waveplates, Multi-Order waveplate, zero order waveplate, true zero order waveplate and dual wavelength waveplate. Our standard size is dia10mm, 12.7mm, 15mm, 20mm, 25.4mm and 30mm. Of course, other size and coating are available upon request.