Rate Equations in a Four-Level Laser. Consider a four-level laser with an active volume V = 1 cm³. The population densit

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Rate Equations In A Four Level Laser Consider A Four Level Laser With An Active Volume V 1 Cm The Population Densit 1 (59.35 KiB) Viewed 322 times

Rate Equations in a Four-Level Laser. Consider a four-level laser with an active volume V = 1 cm³. The population densities of the upper and lower laser levels are N₂ and N₁ and N = N₂ - N₁. The pumping rate is such that the steady-state population difference N in the absence of the stimulated emission and absorption is No. The photon-number density is n and the photon lifetime is Tp. Write the rate equations for N₂, N₁, N, and n in terms of No, the transition cross section σ(v), and the times tsp, T1, T2, T21, and Tp. Determine the steady-state values of N and n.