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Can A Beam Expander be Used in Reverse?

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Can A Beam Expander be Used in Reverse?

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Laser beam expanders are typically used to increase the diameter of a laser beam in order to decrease divergence, minimize focused spot size by expanding the beam before the focusing element, or prevent laser-induced damage inside a system by reducing power density. In a typical laser beam expander orientation, the beam will first encounter a small objective lens and then be collimated by a larger image lens.

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