A new publication from Opto-Electronic Advances; DOI 10.29026/oea.2024.230180, discusses orthogonal matrix of polarization combinations: concept and application to multichannel holographic recording.
The well-known theorem of Pohlke states that three coplanar vectors, not all parallel, can always be obtained by (oblique) parallel projection of three mutually orthogonal vectors of the same length.
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