Another compensation mechanism is a birefringent displacer that has two sections sandwiching a half wave plate, wherein {HEAD ~ the two sections} are of {TAIL ~ different widths} and the planar front surface of the birefringent displacer can be positioned to be non orthogonal with respect to the incident input light beam 
are of
Another compensation mechanism is a birefringent displacer that has two sections sandwiching a half wave plate , wherein { HEAD ~ the two sections } are of { TAIL ~ different widths } and the planar front surface of the birefringent displacer can be positioned to be non orthogonal with respect to the incident input light beam
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH