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Homework answers / question archive / What are the three essential elements inside laser? Describe the purposes and functions of them, respectively
What are the three essential elements inside laser? Describe the purposes and functions of them, respectively. b) In the following four-level system, suppose the lifetime for the level 4, 3, and 2 are 10 ns, 10 us, and 100 ns, respectively. If there is a pumping absorption from 1 4, between which levels the laser emission can appear? Explain. 3 -2