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>
Journal of spectroscopy