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In page Raman spectroscopy:
"Polarization–dependent Raman spectroscopy uses (plane) polarized laser excitation from a polarizer. The Raman scattered light collected is passed through a second polarizer (called the analyzer) before entering the detector. The analyzer is oriented either parallel or perpendicular to the polarization of the laser. Spectra acquired with the analyzer set at both perpendicular and parallel to the excitation plane can be used to calculate the depolarization ratio. Typically a polarization scrambler is placed between the analyzer and detector also.[citation needed]It is convenient in polarized Raman spectroscopy to describe the propagation and polarization directions using Porto's notation,[1] described by and named after Brazilian physicist Sergio Pereira da Silva Porto.
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