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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

pellicle mirror

A thin, stretched plastic membrane cemented to a rigid supporting ring. It may be coated to act as a beamsplitter, for example, in a color camera; it is so thin that no perceptible image doubling appears in the reflected beam. Pellicles are very delicate and liable to resonate to certain vibration frequencies.
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