© 2019 Thorlabs GmbH
2 Getting Started
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2.2 Operating Principle
The PAX1000 is based on the rotating quarter waveplate technique.
The l/4 true zero order waveplate is mounted to a hollow shaft that is driven by a low vibration
DC motor. By this rotation, the waveplate modulates the input polarization. This polarization
modulation is converted by the fixed polarizer into an amplitude modulation of the light intensity
incident to the photo diode. This way, the photo current is modulated as well. A Fast Fourier
Transformation (FFT) analysis allows then to calculate the 3 normalized Stokes vectors s1, s2
and s3, the polarized power and degree of polarization DOP. These parameters are sufficient
to completely describe the polarization state of the light incident on the PAX1000 polarization.
Please see section Rotating Waveplate Technique for detailed explanation.
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