In a recent study we reported on the gradient index (GRIN) lens Stokes polarimeter (GLP) [Opt. Lett. 39, 2656 (2014)]. With a simple architecture, this polarimeter can measure the state of polarization in a single shot. In this article, we present further studies for improving the performance of the GLP. Detailed discussions are presented on the optimization process of the GLP based on different choices of data from the CCD images. It is pointed out that many optimization techniques, although developed for other types of Stokes polarimeters, can also be applied to the GLP because the GRIN lens can traverse all possible retardance and fast axis modulations. (C) 2015 Optical Society of America
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