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Why not just pump directly to the $3^\mathrm{rd}$ level directly in a $4$-level laser system? - Physics Stack Exchange
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Schematic view of a four-level laser system. | Download Scientific Diagram
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Schematic illustration of three and four level lasers | Download Scientific Diagram
Energy diagram of a four level laser system | Download Scientific Diagram
Molecular Expressions: Physics of Light and Color - Laser Energy Levels: Interactive Java Tutorial
