Optical Transmission in an Excited Two-Level Medium

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Transmission characteristics in an excited absorbing medium are discussed on the basis of the photon transport-equation and the rate equations. An increasing power of the CW laser beam passing through the medium is considered when this medium is excited at the same time by a different pulse of radiation. A typical example of a square excitation-pulse states that the transmittance recovers to its original value after it once reaches a maximum value. The time response of the medium depends upon the total number of absorbing centers M, the absorption cross-section σ, and the relaxation time τ as well as the intensity of radiation sources I. The decay time of the increased transmittance is proportional to τ/σM if the quantity (1-M/2τI) is kept constant. As a numerical example the relaxation time of SF_6 is estimated to be 2×10^<-6> s at a pressure of 3.7 Torr in comparison with an experimental result.
社団法人応用物理学会の論文
1971-05-05