Fine tuning method for optimization of liquid crystal based polarimeters

Álvarez Herrero, A., Parejo, P. G., Silvia López, M. 2018. Fine tuning method for optimization of liquid crystal based polarimeters. Optics Express 26, 9, 12038-12048 DOI: 10.1364/OE.26.012038

Liquid crystal variable retarders (LCVR) based polarimeters perform temporal polarization modulation by applying a sequence of driving voltages to introduce different optical retardances. However, even after a careful design and fabrication, manufacturing tolerances (i.e., slight optical axis misalignments, instrument residual polarization, optical activity in the LCVRs…) or the final system configuration (i.e., LCVRs in a convergent optical beam, thermal gradient across the clear aperture…) produce deviations from the ideal setup. As a consequence, all of these effects can reduce the polarimetric modulation efficiency of the device and, therefore, its signal-to-noise ratio. Hence, the voltage sequence applied according to the LCVR calibration curves may not be suitable to reach the optimal theoretical polarimetric efficiencies. In this work, a systematic fine tuning method for the LCVRs driving voltages is described an experimentally demonstrated. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Otras publicaciones