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Poly(ethyleneterephthalate) also known as PET, Mylar, Melinex and Estar is a commodity polyester widely used in a variety of applications: films, bottles or as spun fibers. It is typically quite birefringent in sheet form with distinct refractive indices in all 3 dimensions. As a rule of thumb the in-plane indices increase as the film (or foil) thickness decreases. (At the same time the out-of-plane index decreases.) This is due to the biaxial stretching process used to attain both a desired film thickness and specific sheet mechanical properties. Even formally describing PET film as having a x, y, and z refractive index is not truly sufficient as there is a slight index grading in the thickness direction*. Suffice it to say while this is a very common, everyday material, it is also a surprisingly complicated optical system.

*Elman J.F., Greener J., Herzinger C.M., and Johs B. "Characterization of Biaxially-Stretched Plastic Films by Generalized Ellipsometry" Thin Solid Films 1998, 313/314, 814-818.

Für eine typische Probe von PET betragen der und der bei 1.6357 und 0. Nachfolgend finden Sie Dateien mit vollst?ndigen Brechungsindex und Extinktionskoeffizienten. Wenn die Datei nicht heruntergeladen werden kann, k?nnen Sie unsere propriet?re Datei anfordern, indem Sie auf "Anfordern" klicken.

Referenz für Brechungsindex - Filmetrics composite

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