Why a larger beam results in a smaller spot size in laser designation?
Beam Expander Design Comparison: Keplerian and Galilean
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How to Build a Beam Expander
Beam Expander, Laser Beam Expander
Amazon.com: Cloudray CO2 10600 nm laser beam expander 2x 2.5 x 3 x 4 x 5 x 6 x 8 x galvanometer laser marking lenses optics rays expand 10.6μm-2X : Industrial & Scientific
High Power Laser Beam Expander
Laser Beam Expanders - YouTube
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Components of the experimental setup: Laser, beam expander (BE), SLM,... | Download Scientific Diagram