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Stokes Polarimetry
One method to represent light polarization is to use the Stokes vectors (I, Q, U, and V). A dual PEM system can be used to measure all four Stokes parameters simultaneously, thus to completely characterize the polarization state of light.
SETUP
HOW STOKES PARAMETERS ARE MEASURED
I total intensity; proportional to the DC signal
Q linear polarization component at 0° or 90°; PEM2’s 2f frequency
U linear polarization component at 45°; PEM1's 2f frequency
V circular polarization component; PEM1's 1f frequency
Q, U, and V can be determined simultaneously at a fast data acquisition speed from the outputs of lock-ins I, II and III, respectively.
APPLICATIONS
Astronomy; light source characterization; MSE diagnostic in Tokamak installations
DUAL PEM CONFIGURATIONS
II/FS20&23; II/FS42&47; I/FS50&55 for UV-Vis
II/ZS37&50 for mid-IR
COMPONENTS
Universal PEM MountSignaloc™ 2100 Analog, Dual-Phase Lock-in Amplifier
INSTRUMENTATION
Stokes PolarimeterFURTHER READING
T. C. Oakberg, Application note – Stokes Polarimetry, Hinds Instruments, Inc. (1991).
Stokes Polarimeter Product Bulletin
POLSnap Stokes Polarimeter Product Bulletin
Contact us for more information on using PEMs in Stokes applications.