Physics : Physics

Q1. Compare three level laser system to four-level system.Three level System :E3Step 2: spontaneous emissionStep 1 : pumpingE2LaserStep 3 :Stimulated EmissionE1In three level laser system , the atoms are pumped from ground state E1 to higher state E3 withthe help of the pumping source. The E3 is called pumping state.The life time of atoms is the least in the energy level E3. It means E3 is unstable stable state andhere atoms stay for 10^-9 to 10^-8 seconds.Atoms makes transition from level E3 to E2. Energy level E2 is the metastable state (havinglifetime 10 ...


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