Engg Physics (Uptu 2007)

Engg Physics (Uptu 2007)

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Therefore, in two-level schemes, the state of population inversion cannot be reached. The two level- pumping scheme is shown in Fig. 10.6. The widely used pumping schemes are (a) Three-level pumping scheme, and (b) Four-level pumpinganbsp;...

Title:Engg Physics (Uptu 2007)
Publisher:Tata McGraw-Hill Education - 2007-07-01


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