Uploaded August 2025 | Updated September 2026, 1 week ago

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Laser beam expanders make laser beams larger to minimize their divergence (how they spread out over time) and let them be focused to a final focused spot. Their magnification is a key specification that describes exactly how they affect a beam

Watch to see a beam expander in action and learn more about their magnification

Beam expanders and telescopes share the same basic design, with eyepiece and objective lenses being separated by the sum of their two focal lengths

#optics #science #physics #stem #photonics #laser