Conical refraction Light polarization Polarization Refraction Biaxial crystal Partially polarized light Polarimeters States of polarizations Experimental calibration Fits and tolerances Instrumental error Interferometric techniques Interferometry Measurement errors PRENSA Phase shift Phase structure Polarization devices Polarization distributions Polarization metrologies Polarization state Polarization structures Polarized light beams Snapshot measurement State of polarization Stokes polarimeter Stokes vector Theoretical expression Tolerance analysis Units of measurement