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Physicists Mix Two Lasers to Create Light at Many Frequencies ‘

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ia.ucsb.eduAn artist’s rendition of electron-hole recollision. Near-infrared (amber rods) and terahertz (yellow cones) radiation interact with a semiconductor quantum well (tiles). The near-IR radiation creates excitons (green tiles) consisting of a negative electron and a positive hole (dark blue tile at center of green tiles) bound in an atom-like state. …