Abstract
We report in this paper an instrument for measuring the Stokes parameters of a light beam. This Stokes polarimeter employs two low birefringence photoelastic modulators (PEMs) operating at different resonant frequencies. The two PEMs in the instrument are oriented 45° apart. An analyzer, following the PEM-pair, bisects the PEMs' optical axes. Electronic signals from a detector are analyzed using lock-in amplifiers at the PEMs' first and second harmonics. A computer program calculates and displays the intensity parameter and the normalized Stokes parameters of the light beam measured. Common laboratory lasers are measured as examples.
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