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That second one was very interesting to me as I am currently reading Walter Koechner's book on solid state laser engineering and specifically about materials used for Q-Switching like ADP, KDP, RDP, ADA, KDA, RDA and CDA. These are used as Pockels Cells or Kerr Cells with electric fields either parallel or perpendicular to the light axis. There is also a great deal of information here about the use of 1/4 wavelength and 1/2 wavelength wave plates to change the polarity of light in a single pass to 180 degrees making it possible to have the laser emit at 90 degrees to the axis of light travel. This is all done with birefringent crystals like calcite. All of it brings to mind the search for new crystals to do new things that haven't been accomplished so far.