Summary

• The 3-d TISE solutions
• Pauli exclusion principle
• Periodic table
• Shielding
• L-S coupling

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Chapter 10

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• The two-level atom
• absorption B₁₂
• spontaneous emission A₂₁
• stimulated emission B₂₁
• transition types applet





• Lasers and interactive applet
• population inversion
• nonthermal excitation
• resonant cavity
• 3-level and 4-level systems
• Example problem 10.18
• Example problem 10.21
• Example problem 10.23
• types of lasers
1. He-Ne: cheap, bright
2. Ar⁺: many λ, good power
3. CO: IR high power industrial
4. Nd:YAG: high power pulsed
5. Ti:Sapphire: tunable in IR
6. liquid dye: tunable IR to UV, needs pump laser
7. diode: solid state, tunable, cheap



      Light
      Amplification by
      Stimulated
      Emission of
      Radiation