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This work demonstrates that if crystal plates are identical in thickness in the direction of radiation, the intensity at the output of the polarizer-crystal-crystal-analyzer system equals zero. This means that it is possible to control the difference in thickness between the reference crystal plate (e.g., plates of λ/4 or λ/2) and the examined plate by the intensity of the transmitted radiation. Further, it shows that if nonmonochromatic radiation is used, then the spectrum of radiation at the output is determined by the relative orientation of the optical elements and their sizes. The paper gives the theoretical model for calculations of profile of spectra for the number of important cases of orientation of elements

journal of spectroscopy

Conformity Check of Thickness to the Crystal Plate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mi mathvariant="normal">λ</mml:mi><mml:mo>/</mml:mo><mml:mtext mathvariant="normal">4</mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mi mathvariant="normal">λ</mml:mi><mml:mo>/</mml:mo><mml:mtext mathvariant="normal">2</mml:mtext><mml:mo stretchy="false">)</mml:mo></mml:math>

Conformity Check of Thickness to the Crystal Plateλ/4(λ/2)