TYDEX has developed TWPC for converting polarization of radiation of any wavelength within a wide range. The special software supplied with the instrument can calculate conversion parameters and limits.

A TWPC unit consists of three crystalline quartz birefringent plates. Each plate is placed in a rotator that allows a full circle rotation. The three rotators are rigidly fixed on a common base. The plate is to be rotated to a specific angle for achieving the required conversion of polarization. The angles are calculated in the provided software. Besides plate angles, the software can calculate retardation, effective optical axis and degree of polarization versus wavelength.
The tuning range depends on TWPC parameters. The entire THz range can be covered with the several TWPCs.