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Pellicle Beamsplitters

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About Pellicle Beamsplitters

Pellicle beamsplitters are constructed from thin, nitrocellulose films that are stretched and cemented to rigid supporting rings. Pellicles are very delicate and liable to resonate to certain vibration frequencies.  Unlike thicker beamsplitters, pellicle beamsplitters have the major advantage of eliminating second surface reflections by making them coincident with the original beam. 

Pellicle beamsplitters are available either coated or uncoated.  Uncoated pellicles yield an average reflectivity of 8% from 375–2400 nm. Uncoated pellicles reflect 10% of the incident light when used at 45 degrees, thus providing a useful, low-intensity side beam, thus they are often used in beam sampling applications. Coated pellicle beamsplitters provide equal reflectance and transmission over the same range.  Coated pellicles are generally manufactured with two different coatings, dielectric and Inconel®.  Dielectric coatings are designed for a specific wavelength.  Inconel coating contains nickel, chromium, cobalt, and iron. A thin Inconel film balances the transmission of each element, resulting in a wavelength neutral coating.

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Thorlabs.com - Pellicle Beamsplitter
Beam Samplers Plate Beamsplitters Economy Beamplitters Pellicle Beamsplitters
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Pellicle Beamsplitters

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BEAMSPLIT 2002
Beamsplitters: A Guide for Designers Melles Griot, Photonics Components Div. situations in which the polarization beamsplitter and antireflection
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