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Principle of Photoelastic Modulator PEM
A Photoelastic Modulator (PEM) is an optical device that modulates the polarisation of light to gain information about mechanical stresses in materials. Their ability to modulate light polarization at high frequencies has made them indispensable tools in various scientific and industrial. Here k = 21⁄4= ̧ = (n + i·)!=c, ! is the angular frequency, c is the speed of light. In the solid the refractive idex can be described as Here x; y; z is the high symmetery direction in the solid. As such, Hinds has become a key contributor to a wide range of critical.