Definition of spatial filter

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PFG Precision Optics - Precision Optics 12/24 LB

Photonics Dictionary

spatial filter: 1. Generally, an emulsion mask having a clean annular region in an otherwise opaque region. It is designed to eliminate undesired information. 2. A pinhole in a metal plate, placed at a focal plane in a laser beam expander to deflect unwanted radiation.

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