,,=n/npRutileprismisusuallyusedbecauseofitslargerefractiveindex().(orpretiltangle)isneededtostabilizethetwistdeformation,topreventreversetilt,:1-2oSTN:4-8oThepretiltangleisdeterminedby(1)thePImaterialand(2),ellwhichishomogeneouslyalignedandwhichisreasonablythick(~30-50mm),=.(Fabry-Peroteffect)Formultiplereflectioninterference,itcanbeshownthatthereflectedsignalisgivenbywhereR==:(1)Rotationmethod:Justlikecrystalrotationtomeasurethetiltangle,qisrotat
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