... Ruby,Ti:Sapphire, Fiber, Semiconductor), Chemical (HF), X-ray,…Laser typesA scheme of laser Chapter XXV Chapter XXVQuantum GeneratorsQuantum Generators§1. Principle of light amplification§2. ... processes:1.1.1 Absorption:• Atoms absorb light (photon) and transistfrom a lower to higher (exited) energy levels• Absorption rate:1121121FNNWdtdNabsE1E2•...