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radiation - Would a laser with four possible energy levels be better than three? - Physics Stack Exchange
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PDF] The low- level laser therapy in temporo-mandibular disorders-an update of the current literature | Semantic Scholar
How does the material used in laser affect the type of emitted light? How is the four level laser more suitable? - Quora
1.: Simplified 4-level (left) and 3-level (right) system. The 3-level... | Download Scientific Diagram
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