File:PhaseGratingAndTalbotEffect.jpg

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English: Top: Home-made phase grating, period = 2mm.

Between two glass plates, two plastic foils with vertical slits (1mm each) are placed in line oil.
Line oil and plastic foild do have about the same index of refraction,
so light gets delayed by about half a wavelength even plastic thickness is 2x20µm or so.

Bottom: Talbot effect using above grating shows a replication of grating structure.
Distance to light source is 1.5m (d*d/\lambda/4), distance to mirror is 0.75m (d*d/\lammbda/8).
Mirror degrates image quality strongly, but allows to display it on same image.

On the right hand side in the background there is a flowerpot :-)
Deutsch: Oben: Eingebau-Phasengitter (alles vom Glaser, Supermarkt, Baumarkt), Periode = 2mm

Zwischen zwei 3mm-Glasscheiben schwimmen 2 Plastikfolien mit vertikalen Schlitzen in Leinöl.
Leinöl und Plastikfolie haben einen ähnlichen Brechungsindex,
deshalb wird das Licht um ca. eine halbe Wellenlänge mehr in der Folie verzögert als im Öl, obwohl die Folien 2x20µm stark ist.

Unten: Talbot-Effekt mit diesem Gitter zeigt eine Kopie der Gitterstruktur.
Die Entfernung zur Lichtquelle (\lambda = 666nm) ist 1.5m (d*d/\lambda/4), der Abstand zum Spiegel ist 0.75m (d*d/\lammbda/8).
Der Spiegel verschlechtert die Bilqualität erheblich, aber erlaubt alles auf ein Bild zu bringen.

Rechts hinten ist ein Blumentopf :-)
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Author OlPr

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current11:40, 2 January 2011Thumbnail for version as of 11:40, 2 January 2011775 × 1,189 (104 KB)OlPr (talk | contribs){{Information |Description={{en|1=<u>Top</u>: Home-made phase grating, period = 2mm.<br/> Between two glass plates, two plastic foils with vertical slits (1mm each) are placed in line oil.<br/> Line oil and plastic foild do have about the same index of r

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